121 results on '"P A Conz"'
Search Results
52. The Concept of Adequacy in Peritoneal Dialysis
- Author
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P A Conz, S Q Lew, F. Agostini, C. Ronco, G La Greca, and J P Bosch
- Subjects
medicine.medical_specialty ,Rehabilitation ,Dry body weight ,business.industry ,medicine.medical_treatment ,030232 urology & nephrology ,Blood purification ,General Medicine ,030204 cardiovascular system & hematology ,Surgery ,Peritoneal dialysis ,03 medical and health sciences ,0302 clinical medicine ,Nephrology ,Kt/V ,Medicine ,Renal replacement therapy ,Dialisis peritoneal ,business ,Blood urea nitrogen - Abstract
The aim of renal replacement therapy is to obtain blood purification from metabolic waste products sufficient to achieve patient rehabilitation, the control of dry body weight, and the correction of acid base and electrolyte imbalances (1–3). Among these, the correction of the hormonal imbalances as a result of renal disease would also be required (4). However, this is difficult to achieve, and the majority of substitute therapies such as hemodialysis and peritoneal dialysis focus on blood purification and fluid and electrolyte homeostasis. For this reason the search for the optimal dialytic therapy has been limited to the possibility of achieving a treatment that could at least be adequate in terms of blood purification and patient rehabilitation. Therefore, dialysis adequacy has been selected as a term to indicate successful renal replacement therapy, one that could overcome most of the uremic symptoms and allow the patient to reach a sufficient degree of rehabilitation, even though the treatment is far from the complete and optimal substitution of the lost kidney function in its whole. In recent years the concept of dialysis adequacy has been studied by several authors, and a continuous evolution of this concept has been observed. From the original description of the square-meter-hour hypothesis of Babb and Scribner in 1971 (5), a series of new studies led to the clinical application of various indices devoted to describing the level of efficiency achieved by dialysis treatment (6,7). Finally, after the American National Cooperative Dialysis Study was analyzed, and the KTN index was selected as a marker for dialysis adequacy, the majority of authors now rely on this index and are proposing various formulas for its calculation (8–11).
- Published
- 1994
53. Ash Split Cath® in Geriatric Dialyzed Patients
- Author
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M Normanno, E. Rizzioli, Fabio Fabbian, P A Conz, G Preciso, and C Catalano
- Subjects
medicine.medical_specialty ,medicine.medical_treatment ,Fistula ,Population ,030232 urology & nephrology ,Biomedical Engineering ,Medicine (miscellaneous) ,Bioengineering ,030204 cardiovascular system & hematology ,Geriatric patient ,Hemodialysis ,Tunnelled catheter ,Biomaterials ,03 medical and health sciences ,0302 clinical medicine ,medicine ,education ,Dialysis ,education.field_of_study ,Venous pressure ,business.industry ,General Medicine ,Blood flow ,medicine.disease ,Surgery ,Catheter ,Venous thrombosis ,business - Abstract
Vascular access is the essential step in performing hemodialysis in uremic patients. In the absence of a permanent and utilizable native arterio-venous fistula, the use of a tunnelled catheter makes dialysis therapy possible. The Ash Split Cath, a recently introduced chronic hemodialysis catheter, was inserted in five patients (7.1 % of our prevalent dialysis population) because of repeated venous thrombosis in three patients and a poor venous tree in two. The mean age of patients was 78 years ± 7. The average blood flow rate was 250 ± 50 ml/minute and the mean venous pressure 140mm Hg ± 35. Recirculation determined by low flux technique was less than 2 %. KT/V calculated 3 months after the catheter placement was 1.2 ± 0.02. During the follow-up we did not document any infection of the exit site or related to the catheter. This device is simple to place, gives adequate dialysis treatment and is useful in geriatric dialyzed patients in whom the arterio-venous fistula can no longer be used.
- Published
- 2001
54. Vascular Calcification of the Venous Side of an Arterious-Venous Fistula
- Author
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F. Fabbian, C. Catalano, L. Davì, M. Normanno, E. Rizzioli, and P. A. Conz
- Subjects
medicine.medical_specialty ,arteriovenous fistula ,calcification (complication ,diagnosis ,etiology) ,vein calcification (complication ,business.industry ,Fistula ,Vascular Calcifications ,medicine.disease ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Nephrology ,Medicine ,Surgery ,Radiology ,business ,Vascular calcification ,Calcification - Abstract
While reports of venous calcifications are scarce, vascular calcifications frequently occur in the arteries of uraemic patients. Venous calcification of an aged arterious-venous (a-v) fistula in a young patient with a long-standing history of hyperparathyroidism was detected on a forearm X-ray. Risk factors for vascular calcifications are still under debate, but calcium-phosphate product appears to be involved in its pathogenesis. We suggest that a-v fistula of patients with hyperparathyroidism history should be monitored as calcifications could be a risk factor for access thrombosis.
- Published
- 2001
55. Paired Filtration Dialysis: Studies on Efficiency, Flow Dynamics and Hydraulic Properties of the System
- Author
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M. Milan, M. Scabardi, Roberto Dell'Aquila, P A Conz, Stefano Chiaramonte, G. La Greca, C. Ronco, Alessandra Brendolan, Luisa Bragantini, and Mariano Feriani
- Subjects
medicine.medical_treatment ,Bicarbonate ,Hydrostatic pressure ,Ultrafiltration ,law.invention ,Diffusion ,Physical Phenomena ,chemistry.chemical_compound ,Renal Dialysis ,law ,Hemofiltration ,Hydrostatic Pressure ,medicine ,Filtration ,Chromatography ,Chemistry ,Physics ,Metabolic acidosis ,Hematology ,General Medicine ,medicine.disease ,Membrane ,Nephrology ,Dialysis (biochemistry) ,Blood Flow Velocity - Abstract
Several strategies have been proposed to increase dialysis efficiency in order to reduce dialysis treatment time. Paired filtration dialysis (two-chamber technique) is a new technique combining the advantages of highly permeable membranes and convective transport with the high depurative efficacy of diffusion. The system operates with two units in series (hemofilter + dialyzer) with membranes of polysulfone and hemophan, respectively. A detailed analysis of the hydraulic properties of the system and its possible optimization in terms of depurative efficiency is reported in this paper. In vitro and in vivo tests provided data sufficient to draw some hypotheses on a new utilization of the system. The system appears to be adequate for operating under conditions of high blood flows, however, some limitations were evidenced during our evaluation: the convective component may be insufficient and further increases are impossible because of the limiting effect of the low surface area of the hemofilter; the configuration in which the weight loss is achieved in the hemofilter exposes to the risk of backfiltration in the dialyzer, reducing the benefits of a highly biocompatible system, and the use of acetate in the dialysate and/or lactate in the substitution fluid may interfere with a satisfactory correction of metabolic acidosis. On the basis of our evaluations, some changes can be proposed such as: (1) increased surface area of the hemofilter; (2) use of blood flows higher than 300 ml/min; (3) use of bicarbonate in the dialysate and in the replacement solution; (4) increased convective component with ultrafiltration rates of 50-60 ml/min and full replacement with substitution fluid in between the two filters, and (5) weight loss achieved in the dialyzer with a constantly positive transmembrane pressure. With such a modification of the operative conditions, paired filtration dialysis can be probably applied as a highly efficient dialysis technique in a large number of patients with a significant reduction of dialysis treatment time.
- Published
- 1990
56. Alpha-1-Antichymotrypsin in Renal Biopsies
- Author
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P A Conz, P A Bevilacqua, Mariano Feriani, C. Ronco, S. Meli, Alessandra Brendolan, G. Pietribiasi, G. La Greca, and Roberto Dell'Aquila
- Subjects
Pathology ,medicine.medical_specialty ,alpha 1-Antichymotrypsin ,Renal glomerulus ,Biopsy ,Kidney Glomerulus ,Alpha (ethology) ,Monocytes ,Alpha 1-antichymotrypsin ,Nephropathy ,medicine ,Humans ,Kidney ,biology ,medicine.diagnostic_test ,business.industry ,Macrophages ,Proteolytic enzymes ,medicine.disease ,medicine.anatomical_structure ,alpha 1-Antitrypsin ,biology.protein ,Immunohistochemistry ,Kidney Diseases ,Renal biopsy ,business ,Biomarkers - Abstract
Alpha 1-Antichymotrypsin (alpha 1-AK) and alpha-1-antitrypsin (alpha 1-AT) represent a defense mechanism to protect the tissues from proteolytic enzyme activity. We studied the implication of alpha 1-AK and alpha 1-AT in glomeruli of patients with different nephropathies based on the analysis of 52 paraffin-embedded renal biopsies with alpha 1-AK and alpha 1-AT antisera. The results demonstrate an intense alpha 1-AK glomerular staining in renal biopsies from patients with minimal-change disease, while a minor staining of this protein was found in the other nephropathies. No significant evidence of alpha 1-AT deposits was observed in our cases. Our findings suggest that when alpha 1-AK is lacking in glomeruli the defense mechanisms against proteolytic enzymes may not be efficient enough to protect the glomerular structures and limit the damage. Since alpha 1-AK is a reactant of the acute phase of inflammation, it may be considered as a marker of activity for monocyte-macrophages in glomerular damage.
- Published
- 1990
57. Slow maturation of arterio-venous fistula in seven uremic patients: use of Ash Split Cath(R) as temporary, prolonged vascular access
- Author
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G. La Greca, P A Conz, and Carlo Crepaldi
- Subjects
medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,030232 urology & nephrology ,Vascular access ,030204 cardiovascular system & hematology ,Arterio-venous fistula ,Surgery ,03 medical and health sciences ,Catheter ,0302 clinical medicine ,medicine.anatomical_structure ,Nephrology ,Cuff ,medicine ,Hemodialysis ,Vein ,business ,Internal jugular vein ,Dialysis - Abstract
The temporary vascular access is the essential condition required to perfrom hemodialysis in uremic patients in the absence of a permanent and utilizable vascular access. The cannulation of a central vein with a dual lumen catheter may be useful when a few weeks are required for the maturation of AVF. Longer times for AVF maturation (such as in diabetic patients and in aged patients) impose the use of a tunnelled catheter such as Tesio Catheter or Hickman Catheter which lead to minor complications and more efficient dialysis treatment. The Ash Split Cath®, a recently introduced chronic hemodialysis catheter, provides dialysis via a transcutaneous portion containing a 14 French cylindrical shaped catheter with D-shaped lumens and a dacron cuff. Due to the slow maturing of AVF, in our Department the Ash Split Cath has been used in 7 uremic patients (3 males and 4 females) who required hemodialysis. The cannulation of the internal jugular vein was performed by an ultrasound assisted technique and the correct catheter position was verified by standard chest X-rays. The average blood flowrates were 250 ml/min, and the mean KT/V calculated in all patients one month after the beginning of the dialytic therapy was 1.09 ± 0.02. In six patients the catheter was utilized for at least 4 months, in one patient for 8 months. The devices were easily removed when the patient's AVF was functional and usable. We found that the use of the Ash Split Cath as a temporary, prolonged vascular access in uremic patients was optimal allowing for flexibility in organizing the dialysis treatment schedule and in yielding a good performance in the initial dialysis therapy. Moreover, this device allows, in these patients, a satisfactory dialysis efficiency.
- Published
- 2007
58. [Femoral arteriovenous fistula: a late uncommon complication of central venous catheterization]
- Author
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P A, Conz, A, Malagoli, M, Normanno, and D, Munaro
- Subjects
Femoral Artery ,Catheterization, Central Venous ,Arteriovenous Fistula ,Humans ,Female ,Femoral Vein ,Aged - Abstract
A 77-year-old woman was admitted due to AV graft thrombosis; given the technical impossibility of performing other native AV fistulas, we chose to insert a tunnelled central venous catheter. Considering the vascular history of the patient, the central venous catheter could not be placed into the internal jugular vein; it was therefore put into the left femoral vein. Following a 3-month-period of the catheter working properly, the patient was hospitalized due to sudden acute pain in the left thigh. In a few days the patient developed an important haematoma with serious anemization in the left lower limb. Ultrasonography showed the presence of a fistula between the left common femoral artery and the femoral vein, leading to the subsequent successful positioning of a stent into the common femoral artery through right trans-femoral access. Angiography examination showed the femoral vein patency along the proximal stretch with respect to the function of the tunnelled venous catheter.
- Published
- 2007
59. Convective and adsorptive removal of beta2-microglobulin during predilutional and postdilutional hemofiltration
- Author
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Antonio Santoro, Roberto Padrini, Emanuela Rizzioli, P A Conz, Elena Mancini, and Cristina Canova
- Subjects
Convection ,Male ,medicine.medical_specialty ,Predilution ,medicine.medical_treatment ,Beta2-microglobulin ,Models, Biological ,Kidney Failure ,Adsorption ,Models ,Sieving coefficient ,Hemofiltration ,medicine ,Humans ,Urea ,In patient ,Chronic ,Inverse correlation ,Aged ,Chromatography ,Fouling ,Chemistry ,Beta-2 microglobulin ,Middle Aged ,Biological ,Postdilution ,Creatinine ,Female ,Kidney Failure, Chronic ,Sorption Detoxification ,beta 2-Microglobulin ,Surgery ,Nephrology - Abstract
Convective and adsorptive removal of β2-microglobulin during predilutional and postdilutional hemofiltration. Background Beta 2 -microglobulin (β2-m) removal in patients with end-stage renal disease (ESRD) is maximal with convective techniques, such as hemofiltration (HF) or hemodiafiltration (HDF). Although the infusion mode of the replacement solution (predilution or postdilution) is expected to influence the efficiency of HF, experimental data in this respect are scanty. We therefore investigated the impact of the fluid reinfusion mode on the efficiency of HF in 11 ESRD patients who underwent both treatments. Methods The dialyzer (AK 200 ULTRA) was equipped with a 3-layer polyamide membrane (Poliflux 21 S, surface 2.1m 2 ) and blood flow was kept between 300 and 400mL/min. β2-m concentrations were measured in plasma water and ultrafiltrate at appropriate times during a 240-minute treatment. The following dialytic parameters were calculated: total amount of β2-m removed (A tot ), β2-m removed by convection (A con ) and by adsorption (A ads ), percent reduction in β2-m plasma water concentration (% Cpw in ), total plasma water clearance (CLpw tot ), convective plasma water clearance (CLpw con ), adsorptive plasma water clearance (CLpw ads ), and sieving coefficient (SC). Results CLpw tot , CLpw ads , and% Cpw in were similar in pre- and postdilutional conditions, whereas CLpw con and SC were higher and CLpw ads was lower in postdilution than in predilution HF. Since a significant inverse correlation was found between A ads and SC, predilution probably determines greater protein fouling than postdilution. Conclusion The 2 techniques appear to be equivalent in terms of total β2-m removal, although this final result is obtained by different contributions of convective and adsorptive elimination.
- Published
- 2005
60. Nursing interventions with people with obesity in Primary Health Care: an integrative review.
- Author
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Vanessa Augusta Souza Braga, Maria Cristina Pinto de Jesus, Claudete Aparecida Conz, Renata Evangelista Tavares, Marcelo Henrique da Silva, and Miriam Aparecida Barbosa Merighi
- Published
- 2017
- Full Text
- View/download PDF
61. [Renal function, organic acid transport and protein binding: the three elements defining the response to diuretics in clinical practice: an update]
- Author
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P A, Conz
- Subjects
Nephrotic Syndrome ,Humans ,Kidney Failure, Chronic ,Kidney Diseases ,Nephrons ,Diuretics ,Kidney ,Protein Binding - Abstract
Organic anion transporters (OATs), which are expressed in proximal tubule cells, mediate diuretic secretion into tubular fluid. Increased plasma levels of organic anions and urate and metabolic acidosis, i.e. two characteristic features of chronic renal insufficiency, could be factors contributing to diuretic resistance. These limitations demand increasing doses of diuretics up to a maximum level, or the use of a loop diuretic with non-renal metabolism. Diuretic responsiveness in nephrotic syndrome is limited by strong Na+ reabsorption in the distal nephron. Strategies to improve loop diuretic responsiveness include diuretic dosage and the combination of a loop diuretic with a distal acting diuretic. Strategies to limit protein excretion include the use of angiotensin converting enzyme inhibitors or angiotensin receptor blockers and appropriate salt intake limitation.
- Published
- 2005
62. Mid-dilution: the perfect balance between convection and diffusion
- Author
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A, Santoro, P A, Conz, V, de Cristofaro, I, Acquistapace, R, Gaggi, E, Ferramosca, J L, Renaux, E, Rizzioli, and M L, Wratten
- Subjects
Diffusion ,Blood ,Humans ,Equipment Design ,Hemodiafiltration ,Convection - Abstract
Although hemodiafiltration (HDF) offers the advantage of increased convective clearance for middle molecules, there is still controversy as to whether reinfusion should occur pre- or post-filter. Mid-dilution hemodiafiltration (MD HDF) is a new HDF technique that uses a special dialyzer, MD190, which allows both pre- and post-reinfusion. While externally the dialyzer looks similar to conventional hemodialyzers, the internal fibers are divided into two bundles by a special annular header that first lets the blood pass through the peripheral bundle in post-dilution, mix with the reinfusion fluid at the opposite end of the dialyzer and then proceed (after pre-dilution) to the dialyzer blood exit. The dialyzer is able to support substantially higher reinfusion rates (10-12 l/h). We have compared the removal characteristics of several small solutes and larger middle-molecular-weight toxins by examining instantaneous clearance at 45 min, the dialysis reduction ratio and total mass removal (by spilling) in a three-center prospective cross-over study. Twenty patients were randomized to a treatment sequence of one-week high-flux bicarbonate hemodialysis (HD) followed by MD HDF, or vice versa. The parameters evaluated included urea, creatinine, beta2-microglobulin, angiogenin, leptin, retinol-binding protein, and the effects on sodium, potassium, bicarbonate and calcium. Blood flow rates ranged between 300-450 ml/min (mean 359 +/- 44 HD, 367 +/- 35 MD HDF). The mean reinfusion for MD HDF was 166 +/-17 ml/min. MD HDF had a significantly better instantaneous clearance for urea (328 +/- 28 vs 277 +/- 40); creatinine (292 +/- 32 vs. 212 +/- 66); phosphate (324 +/- 38 vs. 242 +/- 63); beta2-microglobulin (249 +/- 27 vs. 100 +/- 24); angiogenin (173 +/- 27 vs. 28 +/- 32); and leptin (202 +/- 29 vs. 63 +/- 43). Treatments were well tolerated with no adverse reactions occurring during any of the treatments. The MD HDF filter's unique configuration is designed to deliver high-efficiency HDF with a significant improvement in small and middle molecule removal. MD HDF supports substantially higher ultrafiltration rates, and as such, results in a higher removal of middle-molecular-weight toxins.
- Published
- 2005
63. Mid-Dilution: The Perfect Balance between Convection and Diffusion
- Author
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E. Rizzioli, Emiliana Ferramosca, Antonio Santoro, V. de Cristofaro, P A Conz, J.L. Renaux, R. Gaggi, Mary Lou Wratten, and Irene Acquistapace
- Subjects
medicine.medical_specialty ,Creatinine ,integumentary system ,business.industry ,medicine.medical_treatment ,Bicarbonate ,Sodium ,Urology ,chemistry.chemical_element ,Blood flow ,Surgery ,chemistry.chemical_compound ,Ultrafiltration (renal) ,chemistry ,medicine ,Urea ,Hemodialysis ,business ,Dialysis - Abstract
Although hemodiafiltration (HDF) offers the advantage of increased convective clearance for middle molecules, there is still controversy as to whether reinfusion should occur pre- or postfilter. Mid-dilution hemodiafiltration (MD HDF) is a new HDF technique that uses a special dialyzer, MD190, which allows both pre- and postreinfusion. While externally the dialyzer looks similar to conventional hemodialyzers, the internal fibers are divided into two bundles by a special annular header that first lets the blood pass through the peripheral bundle in ‘postdilution’, mix with the reinfusion fluid at the opposite end of the dialyzer and then proceed (after ‘predilution’) to the dialyzer blood exit. The dialyzer is able to support substantially higher reinfusion rates (10-12 l/h). We have compared the removal characteristics of several small solutes and larger middle-molecular-weight toxins by examining instantaneous clearance at 45 min, the dialysis reduction ratio and total mass removal (by spilling) in a three-center prospective cross-over study. Twenty patients were randomized to a treatment sequence of one-week high-flux bicarbonate hemodialysis (HD) followed by MD HDF, or vice versa. The parameters evaluated included urea, creatinine, Β2-microglobulin, angiogenin, leptin, retinol-binding protein, and the effects on sodium, potassium, bicarbonate and calcium. Blood flow rates ranged between 300-450 ml/min (mean 359 ± 44 HD, 367 ± 35 MD HDF). The mean reinfusion for MD HDF was 166 ±17 ml/min. MD HDF had a significantly better instantaneous clearance for urea (328 ± 28 vs 277 ± 40); creatinine (292 ± 32 vs. 212 ± 66); phosphate (324 ± 38 vs. 242 ± 63); Β2-microglobulin (249 ± 27 vs. 100 ± 24); angiogenin (173 ± 27 vs. 28 ± 32); and leptin (202 ± 29 vs. 63 ± 43). Treatments were well tolerated with no adverse reactions occurring during any of the treatments. The MD HDF filter’s unique configuration is designed to deliver high-efficiency HDF with a significant improvement in small and middle molecule removal. MD HDF supports substantially higher ultrafiltration rates, and as such, results in a higher removal of middle-molecular-weight toxins.
- Published
- 2005
64. [Permanent vascular catheters: Effectiveness and duration of the Ash-Split Cath]
- Author
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P A, Conz
- Subjects
Aged, 80 and over ,Catheterization, Central Venous ,Catheters, Indwelling ,Time Factors ,Renal Dialysis ,Humans ,Thrombosis ,Jugular Veins ,Blood Flow Velocity ,Aged - Abstract
In absence of a permanent and useful native arterio-venous fistula, the use of a tunnelled catheter allows dialysis therapy to be carried out. The Ash Split Cath is a recently introduced chronic hemodialysis catheter. An ASC was inserted in nine patients (7.1% of our prevalent dialysis population), for repeated venous thrombosis in seven patients and a poor venous tree in two. The average blood flow rate was 250 +/- 50 mL/minute and the mean venous pressure measured was 140mm Hg +/- 35. Recirculation determined by low flow technique was less than 5% and 4 months after the catheter placement, calculated Kt/V, was 1.2 +/- 0.02. During the follow up we did not document any infection of the exit site or related to the catheter.
- Published
- 2003
65. [Physiopathology of pre-eclampsia]
- Author
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P A, Conz and C, Catalano
- Subjects
Renin-Angiotensin System ,Sympathetic Nervous System ,Pre-Eclampsia ,Pregnancy ,Prostaglandins ,Humans ,Female ,Lipid Peroxidation ,Blood Coagulation ,Thromboplastin - Abstract
Pre-eclampsia is a pregnancy-specific disorder that presents major health problems for both mothers and babies. It is a major cause of maternal mortality, especially in developing countries, where it may account for 80% of maternal deaths. In this review we have discussed the putative pathogenetic mechanisms of this severe illness.Review of the international literature on pre-eclampsia.Pre-eclampsia occurs predominantly in primigravidas and is associated with increased foetal and maternal risk. Generally speaking, one could hypothesise that during pre-eclampsia the oxidative, coagulative and vasomotor balance is altered by increased sensitivity to angiotensin II associated with reduced synthesis of vasodilator prostaglandins, sympathetic nervous system hyperactivity, hyperlipidaemia associated with raised lipoperoxide synthesis and incomplete implant of cytotrophoblast in maternal spiral arteries. General vasoconstriction could then be a consequence with related utero-placental ischaemia and endothelial damage. These features are clinically characterised by arterial hypertension, proteinuria and sodium retention. The predisposition to develop pre-eclampsia seems to be at least partially hereditary and the risk seems to be transmissible through male sons. To explain the susceptibility of some women to develop pre-eclampsia, specific genetic polymorphisms have been associated to increased risk.Many factors are involved in the pathogenesis of pre-eclampsia. Occasionally these factors seem to act together, sometimes they do not and, consequently, it might be difficult to postulate a common pathogenesis for the disorder. Good obstetrical practice will identify known risk factors but will not enable physicians to determine the risk value for a particular pregnancy. Moreover, we are far from understanding the exact mechanisms involved, let alone acting upon them. The achievement of these objectives constitute a remarkable challenge for research.
- Published
- 2003
66. Stomach phytobezoars in two uremic anorexic patients
- Author
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C Catalano, Fabio Fabbian, P A Conz, and L. Leone
- Subjects
Hemodialysis patients ,Male ,medicine.medical_specialty ,Population ,Anorexia ,Gastroenterology ,Bezoars ,Autonomic neuropathy ,Phytobezoars ,Internal medicine ,medicine ,Humans ,education ,Aged ,Uremia ,education.field_of_study ,medicine.diagnostic_test ,Gastric emptying ,Esophagogastroduodenoscopy ,business.industry ,Stomach ,digestive, oral, and skin physiology ,medicine.disease ,Surgery ,medicine.anatomical_structure ,Phytobezoar ,Bezoar ,medicine.symptom ,business - Abstract
Conglomerates of food and mucus or phytobezoars composed of vegetable matter are sometimes found in the stomach in the general population. Reports of phytobezoars in uremic patients are, however, scarce. Here we describe 2 uremic patients in which esophagogastroduodenoscopy was performed due to dyspepsia associated with weight loss and in which stomach phytobezoars were discovered. Theoretically, uremic patients should be at risk for producing bezoars. In fact, these patients frequently present predisposing conditions such as autonomic neuropathy, diabetes mellitus and delayed gastric emptying. Gastric bezoars cause anorexia. Anorexia is a frequent symptom in dialysis patients and is associated with malnutrition. In these patients, malnutrition is strongly associated with mortality and is quite difficult to reverse. Similarly, phytobezoars cause chronic anorexia. We suggest that clinicians working in dialysis units should consider the possibility of a gastric bezoar when evaluating anorexic uremic patients.
- Published
- 2002
67. Ash Split Cath in geriatric dialyzed patients
- Author
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P A, Conz, C, Catalano, E, Rizzioli, M, Normanno, F, Fabbian, and G, Preciso
- Subjects
Aged, 80 and over ,Catheters, Indwelling ,Renal Dialysis ,Humans ,Equipment Design ,Venous Pressure ,Aged - Abstract
Vascular access is the essential step in performing hemodialysis in uremic patients. In the absence of a permanent and utilizable native arterio-venous fistula, the use of a tunnelled catheter makes dialysis therapy possible. The Ash Split Cath, a recently introduced chronic hemodialysis catheter, was inserted in five patients (7.1% of our prevalent dialysis population) because of repeated venous thrombosis in three patients and a poor venous tree in two. The mean age of patients was 78 years +/- 7. The average blood flow rate was 250+/-50 ml/minute and the mean venous pressure 140mm Hg +/- 35. Recirculation determined by low flux technique was less than 2%. KT/V calculated 3 months after the catheter placement was 1.2+/-0.02. During the follow-up we did not document any infection of the exit site or related to the catheter. This device is simple to place, gives adequate dialysis treatment and is useful in geriatric dialyzed patients in whom the arterio-venous fistula can no longer be used.
- Published
- 2001
68. TINU syndrome associated with reduced complement levels
- Author
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Luisa Bragantini, P A Bevilacqua, P A Conz, G. La Greca, and M. Milan
- Subjects
CD4-Positive T-Lymphocytes ,Pathology ,medicine.medical_specialty ,Biopsy ,Tubulointerstitial nephritis and uveitis ,CD8-Positive T-Lymphocytes ,Uveitis ,Immunopathology ,medicine ,Humans ,Acute-Phase Reaction ,Kidney ,medicine.diagnostic_test ,business.industry ,Complement C4 ,Syndrome ,Middle Aged ,medicine.disease ,medicine.anatomical_structure ,Kidney Tubules ,Immunology ,Immunohistochemistry ,Nephritis, Interstitial ,Female ,Renal biopsy ,business ,CD8 ,Kidney disease - Abstract
The TINU syndrome (tubulointerstitial nephritis and uveitis) was first described by Dobrin et al. in 1975. Since then, more than 50 cases have been documented each with diverse immunopathogenetic and genetic characteristics. The aim of this report is to describe a case of TINU associated with reduced complement levels. We profile a 48-year-old white female with persistently reduced C4 complement levels during the acute phase of the pathology and with an unaltered immunologic profile. Renal biopsy evidenced a significant lymphocytic interstitial infiltration. Immunohistochemical studies of the interstitium infiltrates was positive for the presence of the T (CD3) markers (CD4 > CD8). Steroid therapy yielded a complete regression of the symptomatology with normalization of the complement levels. We suggest that it is possible to hypothesize that the various immunologic alterations associated with TINU, including the transient reduction complement levels, may be secondary to multiple inflammatory mechanisms which express themselves throughout the pathology.
- Published
- 2001
69. Cannulation of the internal jugular vein: comparison of the classic Seldinger technique and an ultrasound guided method
- Author
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P A, Conz, D, Dissegna, M P, Rodighiero, and G, La Greca
- Subjects
Catheterization, Central Venous ,Humans ,Ultrasonics ,Jugular Veins - Abstract
Central venous catheterization allows immediate and easy vascular access for hemodialysis. Accidental arterial puncture is the most frequent complication of central vein cannulation and may occur in up to 8% of cases with the classic Seldinger procedure. We compared the Seldinger technique which implies manual localization of the vascular access, and an ultrasound guided technique, to assess whether the latter is an improvement on the Seldinger procedure.
- Published
- 1998
70. Catheter Tip Position: Outside the Atrium
- Author
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M Normanno, D Munaro, A. Malagoli, C. Bovo, P A Conz, and E. Rizzioli
- Subjects
Catheter ,medicine.anatomical_structure ,Nephrology ,business.industry ,medicine ,Surgery ,Anatomy ,Atrium (heart) ,business ,Tip position - Published
- 2006
71. Actions of nurses toward obesity in primary health care units
- Author
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Vanessa Augusta Souza Braga, Maria Cristina Pinto de Jesus, Claudete Aparecida Conz, Marcelo Henrique da Silva, Renata Evangelista Tavares, and Miriam Aparecida Barbosa Merighi
- Subjects
Obesity ,Health Centers ,Nursing, Practical ,Primary Health Care ,Qualitative Research ,Nursing ,RT1-120 - Abstract
ABSTRACT Objectives: To understand the actions of nurses toward obesity in primary health care units. Methods: A phenomenological study was carried out with 12 nurses of a city in the state of Minas Gerais. The interviews were organized into categories and analyzed according to the social phenomenology of Alfred Schütz and literature associated with the theme. Results: The following categories emerged, expressing the actions of nurses toward obesity prevention and control: “Guidance on healthy lifestyle habits”, “Barriers to the actions of nurses”, and “Focusing specifically on obesity”. Final considerations: Considering that guidance on healthy lifestyle habits was mostly carried out during individual and collective activities directed to the general population, regardless of their weight conditions, nurses must reorganize their professional practice in primary health care units by implementing specific actions for users with obesity or at risk of developing it.
- Full Text
- View/download PDF
72. Assessment of adequacy in peritoneal dialysis
- Author
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Claudio Ronco, Giuseppe La Greca, P A Conz, Susy Q. Lew, and Juan P. Bosch
- Subjects
Adult ,medicine.medical_specialty ,Adolescent ,medicine.medical_treatment ,Urology ,Renal function ,Peritoneal dialysis ,Blood Urea Nitrogen ,chemistry.chemical_compound ,Peritoneal Dialysis, Continuous Ambulatory ,medicine ,Humans ,Urea ,Prospective Studies ,Blood urea nitrogen ,Dialysis ,Aged ,Uremia ,Creatinine ,business.industry ,Continuous ambulatory peritoneal dialysis ,Middle Aged ,medicine.disease ,Surgery ,Treatment Outcome ,chemistry ,Nephrology ,Hemodialysis ,Dietary Proteins ,business ,Mathematics - Abstract
Adequacy of peritoneal dialysis has been less well studied than that of hemodialysis. Fractional urea removal, total creatinine removal, and various indices have been proposed to reflect or predict patient morbidity and mortality. No prospective study has been published in this regard. To evaluate this area further, in addition to reviewing selected literature, 45 continuous ambulatory peritoneal dialysis (CAPD) patients were recruited in two dialysis centers for a prospective study on treatment adequacy. Patients were well rehabilitated and had no peritonitis or hospitalization in the 6 months before the study. Urea and creatinine kinetics were analyzed, as were dietary intake and fluid balance. The weekly Kt/V, calculated to include peritoneal and residual renal clearance (KprT/V), averaged 1.77 with a Kt/V hemodialysis equivalent of 0.59. Patients with residual renal function (58% of the studied population) had an average residual renal clearance of 3.42 mL/min, and had lower steady-state concentrations of urea nitrogen and creatinine in the plasma than patients with no residual renal function. As a consequence, a lower percent excretion of urea and creatinine in the peritoneal fluid was observed in the former patients compared with the latter, where the peritoneal route was the only one for solute excretion. The concentration profiles in blood appear to be the critical factor in achieving the final target of the treatment, ie, the excretion of the overall amount of waste products derived from protein and other metabolic pathways. The constant blood levels in CAPD explain why such a low Kt/V can be adequate whereas, in hemodialysis, a higher Kt/V is required.(ABSTRACT TRUNCATED AT 250 WORDS)
- Published
- 1994
73. Evoluzione Delle Tecniche Dialitiche
- Author
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P A Conz and G. La Greca
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lcsh:Internal medicine ,business.industry ,Medicine ,General Medicine ,business ,lcsh:RC31-1245 ,lcsh:Diseases of the genitourinary system. Urology ,lcsh:RC870-923 - Abstract
non disponibile
- Published
- 1994
74. ULTRAFILTRATION AND CLEARANCE STUDIES IN HUMAN ISOLATED PERITONEAL VASCULAR LOOPS
- Author
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P A Conz, G. La Greca, C. Ronco, M. Milan, Alessandra Brendolan, Carlo Crepaldi, and Luisa Bragantini
- Subjects
medicine.medical_treatment ,Ultrafiltration ,Vascular permeability ,Peritoneal dialysis ,law.invention ,Capillary Permeability ,law ,medicine ,Humans ,Urea ,Filtration ,Chromatography ,Chemistry ,Inulin ,Hematology ,General Medicine ,Blood flow ,Filtration fraction ,Molecular Weight ,Perfusion ,Blood ,medicine.anatomical_structure ,Regional Blood Flow ,Nephrology ,Creatinine ,Peritoneum ,Peritoneal Dialysis ,Artery - Abstract
Eight samples of human peritoneal tissue were obtained from patients undergoing hemicholectomy for cancer. An artery and a vein were cannulated and perfused with blood in vitro with a special circuit able to provide different perfusion pressures. Ultrafiltration and clearance studies were performed in these samples. Both ultrafiltration and small-solute clearances linearly correlated with the blood flow, demonstrating a strong dependence on this parameter. The peritoneal capillary showed a typical filtration pressure equilibrium with a constant filtration fraction at different blood flows. The results suggest that the blood flow may be a factor limiting the efficiency of peritoneal dialysis both in terms of mass transfer coefficients and maximal ultrafiltration rates.
- Published
- 1994
75. Phospholipid hydroperoxide glutathione peroxidase in the normal human kidney: a possible role in protecting cell membranes
- Author
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P A, Conz, P A, Bevilacqua, G, La Greca, D, Danieli, M P, Rodighiero, L, Cavarretta, M, Maiorino, A, Roveri, and F, Ursini
- Subjects
Glutathione Peroxidase ,Reference Values ,Cell Membrane ,Humans ,Tissue Distribution ,Kidney ,Phospholipid Hydroperoxide Glutathione Peroxidase ,Immunohistochemistry - Abstract
Reactive oxygen species have been implicated in the pathogenesis of tissue injury. It is generally accepted that selenium-glutathione peroxidases form an integrated system defending the living organism against oxidative damage. Phospholipid hydroperoxide glutathione peroxidase (PHGPX) is thought to play a prominent role in preventing lipid peroxidation. Indeed, the function of PHGPX is to reduce the lipophilic substrates in membranes. In the present study, we evaluated the expression of PHGPX in normal human kidney by immunohistochemistry. The enzyme in glomeruli is mainly expressed in podocytes and parietal epithelial cells. In addition, PHGPX antigen was detected in tubule epithelial cells. Therefore, these results suggest that renal epithelial cells possess an important antioxidizing activity related to the presence of PHGPX.
- Published
- 1993
76. Peroxidase procedure in renal sections already prepared for immunofluorescence microscopy
- Author
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Roberto Dell'Aquila, B. Cunico, P A Conz, P. A. Bevilacqua, and G. Pietribiasi
- Subjects
Transplantation ,Pathology ,medicine.medical_specialty ,Kidney ,biology ,business.industry ,Immunofluorescence Microscopy ,medicine.anatomical_structure ,Nephrology ,Immunoenzyme techniques ,biology.protein ,Medicine ,business ,Peroxidase - Published
- 1993
77. Peroxidase procedure in renal sections already prepared for immunofluorescence microscopy
- Author
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P A, Conz, G, Pietribiasi, B, Cunico, R, Dell'Aquila, and P A, Bevilacqua
- Subjects
Immunoenzyme Techniques ,Microscopy, Fluorescence ,Humans ,Kidney - Published
- 1993
78. Beta-2-microglobulin and Helicobacter pylori infection in uraemic dialysed patients
- Author
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D. Bernardini, G. La Greca, P A Bevilacqua, P A Conz, S. Dante, and V. Bertoncello
- Subjects
Adult ,Male ,medicine.medical_specialty ,Chronic gastritis ,Gastroenterology ,Helicobacter Infections ,Renal Dialysis ,Internal medicine ,Gastric mucosa ,Medicine ,Humans ,Aged ,Uremia ,Hepatology ,biology ,Helicobacter pylori ,business.industry ,Beta-2 microglobulin ,Middle Aged ,medicine.disease ,biology.organism_classification ,Mucus ,medicine.anatomical_structure ,Gastritis ,Chronic Disease ,Immunohistochemistry ,Female ,medicine.symptom ,business ,beta 2-Microglobulin ,Infiltration (medical) - Abstract
Chronic gastritis in patients with chronic renal failure may have different causes and mechanisms. Recent observations suggest that severe gastritis often found in uraemic patients might be related to Helicobacter pylori (HP) infection. In chronic gastritis HP has been found in the mucus and on the epithelial cell surface of gastric foveolas. Significant infiltration of the subepithelial gastric layer by polymorphonuclear leucocytes has been described. Moreover, beta-2-microglobulin deposits have been found by immunohistochemical methods in the subepithelial layer of gastric mucosa of uraemic dialysed patients with active chronic gastritis and HP infection. Similar findings have also been demonstrated in gastric biopsies from patients with HP positive active chronic gastritis and normal renal function. Since HP infection is associated with significant leucocyte infiltration, it is hypothesized that the inflammatory process causes the release of beta-2-M from the surface of the leucocytes and its subsequent deposition at gastric level.
- Published
- 1992
79. The Ash Split Cath® in 7 Uremic Patients with Slow Maturation of the Arteriovenous Fistula
- Author
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P A Conz, Carlo Crepaldi, and G. La Greca
- Subjects
medicine.medical_specialty ,Text mining ,business.industry ,MEDLINE ,Medicine ,Arteriovenous fistula ,business ,medicine.disease ,Surgery - Published
- 2000
80. Subject Index Vol. 86, 2000
- Author
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Junne-Ming Sung, V. Terracciano, Tatsuo Hosoya, Yutaka Kobayashi, Ken Okumura, Keiko Uchida, Tatsuya Nakatani, Krasimira Sepetlieva, L. Grcevska, G. Maschio, Ayşegül Örs Zümrütdal, Martin Ellbogen, H. Pasantes-Morales, Yoshiyuki Hiki, Robert Dunlay, Jung-Kuei Pai, Mitsuyoshi Furuhashi, Monika Bulla, Shou-Shan Chiang, Toshiyuki Imasawa, Vladisav Stefanovic, E. Sedano, Halil Uçan, J.L. Pérez-Castrillón, Takanari Aoki, Sumio Tateno, Eri Muso, Vincenzo Bellizzi, M. Polenakovic, M. Milovanceva-Popovska, B.K. Bang, Atsushi Fukatsu, Aysun Karabay Bayazit, Kuddusi Cengiz, Michael Field, M. Arrabal-Martín, Giuseppe La Greca, J.H. Park, I. Villen, Leendert C. Paul, Brad Oldemeyer, Rich Jones, M. Pérez-Suarez, Yukitaka Maruyama, Chie Tomida, Keisuke Yamamoto, Slavenka Janković, Kenji Tsuchida, Johan W. de Fijter, Byung Kee Bang, Harutaka Yamada, Hui Kyung Jeon, Jelena Marinkovic, Jerome G. Porush, Diana Ionova, Yasukazu Yamada, Stefan Fründ, Fumiko Tateyama, Sohji Nagase, Danuta Zwolińska, Y.S. Haviv, Shigetake Sasayama, Adriaan M. Kamper, Isao Ohsawa, Predrag Vlahović, Aki Hirayama, Sun Jeong Lim, Takanobu Sakemi, G. Petruševska, Elsie-C. Chan, Shinichi Kakumu, Yoshihiro Matsumoto, Shu-Yin Kuo, Haruo Tomonari, Robert Kleta, Y.M. Choo, Krystyna Szprynger, Masahiko Nakamoto, Matt Koch, Naoyuki Tamura, Heather J. Saunders, Satoru Tsunoda, Junko Tanaka, Shu-May Lin, Satoru Kuriyama, Izumi Amano, Hitoe Suzuki, Hiroshi Tatsumi, Danica Bukvić, Anna Medyńska, Gopala K. Rangan, Kazuhiro Okano, Tetuhiko Yoshida, Qu Huiqi, Biagio Di Iorio, Morito Endo, Atsushi Yamauchi, Tein-Chung Lu, Wei-Chi Lee, Qiu Mingcai, Maria Szczepańska, Akira Kawashima, Jyh-Gang Leu, J. Möcks, Richard J. Lund, Minako Koike, Mutsuko Hidaka, Mitsuaki Kaizuka, Hideaki Yamabe, Kazuho Honda, Akira Hishida, F.J. Pérez-Blanco, Hassan Izzedine, David A. Vesey, Wey-Wen Jiang, Michihiro Gotoh, Jeng-Jong Huang, G.B. Kim, Hacı Veli Atalay, Fen-Fen Chen, Toshiyuki Takahashi, Kosaku Nitta, Aytül Noyan, Yuet-Ching Tay, J.Y. Choi, P A Conz, Takayuki Fujita, Takako Takita, Lin Shan, Ming-Cheng Wang, Hiroshi Nihei, Tsung Hsiu Wang, C.W. Yang, Gilbert Deray, Young Ok Kim, Sun Ae Yoon, Takashi Uzu, Katsuo Suyama, Atsushi Satomura, Eriya Kikawada, Yau-Huei Wei, Chang Hee Han, Marina Mitić-Zlatković, Ali Anarat, Yoshiaki Takemoto, Ljubica Ðukanović, Hirotsugu Iwatani, Kamen Tcachev, York Leng Yu, Junji Terao, Yiping Wang, Kazumasa Aoyagi, Paik-Seong Lim, A. Zuluaga, Akio Koyama, Wako Yumura, Eun Jung Jun, Arao Futenma, A. Rodríguez-Cuartero, Toshika Okumiya, Atsushi Ueda, Hiroshi Osawa, Weier Qi, Akihiko Kato, Gakusen Nishihara, A. Egon van der Bijl, Yoshiko Baba, Chikao Yasunaga, Aya Abe, Chan Joo Kim, Okan Bakınen, I. Justo-Muradas, Masaya Yamato, Katsumi Takemura, Carlo Crepaldi, Carol A. Pollock, Koichi Suzuki, S. Morales Mulia, Yasuhiro Chikamori, Kenichi Shirato, Naoto Miura, Y.S. Kim, David Harris, Eberhard Kuwertz-Bröking, A.J. Meares, Masatomo Yashiro, Vincent Launay-Vacher, Hiroyuki Ohi, David W. Johnson, E. Saracibar, Hatice Bodur, and Masahiro Kakihara
- Subjects
Index (economics) ,business.industry ,Statistics ,Medicine ,Subject (documents) ,business - Published
- 2000
81. Impact of high blood flows on vascular stability in haemodialysis
- Author
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C. Ronco, Alessandra Brendolan, Stefano Chiaramonte, Mariano Feriani, G. Finocchi, G. La Greca, Luisa Bragantini, Roberto Dell'Aquila, P A Conz, B. Agazia, D. Dissegna, A. Fabris, E. De Dominicas, M. Milan, and Carlo Crepaldi
- Subjects
Transplantation ,medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,Cardiovascular System ,Nephrology ,Renal Dialysis ,Internal medicine ,medicine ,Cardiology ,Humans ,Hemodialysis ,Hypotension ,business ,Blood Flow Velocity - Published
- 1990
82. Pathophysiology of ultrafiltration in peritoneal dialysis
- Author
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Roberto Dell'Aquila, Stefano Chiaramonte, G La Greca, Luisa Bragantini, Mariano Feriani, M. Milan, C. Ronco, P A Conz, and Alessandra Brendolan
- Subjects
medicine.medical_specialty ,Membrane permeability ,medicine.medical_treatment ,030232 urology & nephrology ,Ultrafiltration ,Urology ,Peritonitis ,Peritoneal equilibration test ,Peritoneal dialysis ,Capillary Permeability ,03 medical and health sciences ,0302 clinical medicine ,Osmotic Pressure ,Dialysis Solutions ,medicine ,Humans ,business.industry ,Reabsorption ,Microcirculation ,General Medicine ,Blood flow ,Water-Electrolyte Balance ,medicine.disease ,Surgery ,Catheter ,Nephrology ,030211 gastroenterology & hepatology ,Peritoneum ,business ,Peritoneal Dialysis ,Algorithms - Abstract
Pathophysiology of peritoneal ultrafiltration is analyzed in the present study. Peritoneal equilibration test is the easiest procedure to study in detail the possible causes of failure to control the ultrafiltration rate in patients undergoing peritoneal dialysis. Membrane failure, reduction in peritoneal blood flow, excessive lymphatic reabsorption catheter malposition, and fluid sequestration are the most common causes of ultrafiltration loss. Pharmacologic manipulation of peritoneal membrane, correction of mechanical inconvenients, reduction in peritonitis rate and in the level of immunostimulation of the mesotelial macrophages, together with a careful policy in terms of glucose concentration in the dialysate and dwell times may contribute not only to treat different forms of ultrafiltration loss but also to prevent their incidence.
- Published
- 1990
83. Focus vesiculosus: a nephrotoxic alga?
- Author
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P A Conz, P A Bevilacqua, G. La Greca, P Benedetti, and L Cima
- Subjects
Transplantation ,Algae ,biology ,Nephrology ,business.industry ,Botany ,Medicine ,Fucus vesiculosus ,Medicinal poisoning ,business ,biology.organism_classification - Published
- 1998
84. POLIPOSE ADENOMATOSA FAMILIAR (PAF) ATENUADA COM DEGENERAÇÃO MALIGNA: ATRASO NO DIAGNÓSTICO E IMPACTO NA SOBREVIDA
- Author
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Agresta, Vittória Machado, Horta, Sergio Henrique Couto, Boratto, Sandra Di Felicci, Balsamo, Flavia, Rodrigues, Marcella Conz, Brosco, Amanda Vitiello Pereira, Hudari, Guilherme Garcia, and Bouret, Maria Eduarda de Souza
- Published
- 2022
- Full Text
- View/download PDF
85. DOENÇA DE CROHN REFRATÁRIA EVOLUINDO COM PERFURAÇÃO DE SIGMOIDE E FÍSTULA COLOVESICAL
- Author
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Bouret, Maria Eduarda de Souza, Agresta, Vittória Machado, Brosco, Amanda Vitiello Pereira, Hudari, Guilherme Garcia, Batista, Juliana Giangiardi, Zara, Aline, Rodrigues, Marcella Conz, and Horta, Sergio Henrique Couto
- Published
- 2022
- Full Text
- View/download PDF
86. TVP COMO PRIMEIRA MANIFESTAÇÃO DE DOENÇA DE CROHN
- Author
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Hudari, Guilherme Garcia, Boratto, Sandra Di Felicci, Horta, Sérgio Henrique Couto, Balsamo, Flávia, Rodrigues, Marcella Conz, Brosco, Amanda Vitiello Pereira, Bouret, Maria Eduarda de Souza, and Agresta, Vittória Machado
- Published
- 2022
- Full Text
- View/download PDF
87. MELANOMA DE CANAL ANAL: HISTOLOGIA RARA EM LOCAL INFREQUENTE
- Author
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Hudari, Guilherme Garcia, Boratto, Sandra Di Felicci, Horta, Sérgio Henrique Couto, Balsamo, Flávia, Rodrigues, Marcella Conz, Brosco, Amanda Vitiello Pereira, Agresta, Vittória Machado, and Bouret, Maria Eduarda de Souza
- Published
- 2022
- Full Text
- View/download PDF
88. ADENOCARCINOMA GÁSTRICO AVANÇADO E ADENOCARCINOMA DE RETO BAIXO LOCALMENTE AVANÇADO SINCRÔNICOS EM PACIENTE DE 38 ANOS
- Author
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Bouret, Maria Eduarda de Souza, Agresta, Vittória Machado, Brosco, Amanda Vitiello Pereira, Hudari, Guilherme Garcia, Batista, Juliana Giangiardi, Zara, Aline, Rodrigues, Marcella Conz, and Horta, Sérgio Henrique Couto
- Published
- 2022
- Full Text
- View/download PDF
89. ADENOCARCINOMA DE RETO SINCRÔNICO COM TUMOR NEUROENDÓCRINO (TNE) DE APÊNDICE: UMA APRESENTAÇÃO RARA
- Author
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Agresta, Vittória Machado, Horta, Sergio Henrique Couto, Boratto, Sandra Di Felicci, Balsamo, Flavia, Rodrigues, Marcella Conz, Hudari, Guilherme Garcia, Brosco, Amanda Vitiello Pereira, and Bouret, Maria Eduarda de Souza
- Published
- 2022
- Full Text
- View/download PDF
90. The interaction between Implantology and Materials Science.
- Author
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Do DESTERRO, Fernanda de Paula, CAMINHA, Mariana Wolf, GONÇALVES, Eduardo Santiago, VIDIGAL JUNIOR, Guaracilei Maciel, and CONZ, Márcio Baltazar
- Subjects
OSSEOINTEGRATED dental implants ,MATERIALS science ,DENTAL ceramics ,DENTITION ,BIOMATERIALS ,CRYSTALLINITY - Abstract
Introduction: Materials Science has been of paramount importance to Dentistry because the biomaterials involved have specific characteristics that allow them to have a predictable application. In Implantology, the following may be emphasized: biomaterials, membranes and implant surfaces. It is of vital importance to study the physicochemical characteristics of biomaterials in order to correctly choose what provides a specific biological outcome. Therefore, analysis of properties such as crystallinity, particle size, porosity, and specific surface area is crucial to understand the in vivo performance of materials. Implant surfaces have also been developed to improve the osseointegration process in areas with poor quantity or quality of bone. Objective: The aim of this study is to carry out a literature review about the importance of Materials Science in the development of biomaterials used in Implantology. [ABSTRACT FROM AUTHOR]
- Published
- 2013
91. MRI and EEG as long-term seizure outcome predictors in familial mesial temporal lobe epilepsy.
- Author
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Morita ME, Yasuda CL, Betting LE, Pacagnella D, Conz L, Barbosa PH, Maurer-Morelli CV, Costa AL, Kobayashi E, Lopes-Cendes I, and Cendes F
- Published
- 2012
- Full Text
- View/download PDF
92. Physicochemical characterization of two deproteinized bovine xenografts.
- Author
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Accorsi-Mendonça, Thais, Conz, Márcio Baltazar, Barros, Teresa Cristina, de Sena, Lídia Ágata, Soares, Glória de Almeida, and Granjeiro, José Mauro
- Subjects
CALCIUM phosphate ,HYDROXYAPATITE ,XENOGRAFTS ,BIOCOMPATIBILITY ,SCANNING electron microscopy ,SPECTRUM analysis ,THERMAL analysis ,X-ray diffraction ,THERMOGRAVIMETRY - Abstract
Calcium phosphate salts, or more specifically hydroxyapatite, are products of great interest in the fields of medical and dental science due to their biocompatibility and osteoconduction property. Deproteinized xenografts are primarily constituted of natural apatites, sintered or not. Variations in the industrial process may affect physicochemical properties and, therefore, the biological outcome. The purpose of this work was to characterize the physical and chemical properties of deproteinized xenogenic biomaterials, Bio-Oss (Geistlich Biomaterials, Wolhuser, Switzerland) and Gen-Ox (Baumer S.A., Brazil), widely used as bone grafts. Scanning electron microscopy, infrared region spectroscopy, X-ray diffraction, thermogravimetry and degradation analysis were conducted. The results show that both materials presented porous granules, composed of crystalline hydroxyapatite without apparent presence of other phases. Bio-Oss presented greater dissolution in Tris-HCl than Gen-Ox in the degradation test, possibly due to the low crystallinity and the presence of organic residues. In conclusion, both commercial materials are hydroxyapatite compounds, Bio-Oss being less crystalline than Gen-Ox and, therefore, more prone to degradation. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
93. Histomorphometric Analyses Of Bone Interface With Titanium-Aluminum-Vanadium and Hydroxyapatite-Coated Implants by Biomimetic Process.
- Author
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Zagury, Renato, Harari, Nassim David, Conz, Márcio Baltazar, Soares, Glória de Almeida, and Vidigal Jr., Guaracilei Maciel
- Subjects
OSSEOINTEGRATED dental implants ,DENTAL implants ,OSSEOINTEGRATION ,HYDROXYAPATITE ,TITANIUM ,BIOMIMETIC chemicals - Abstract
Copyright of Implant Dentistry is the property of Lippincott Williams & Wilkins and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2007
- Full Text
- View/download PDF
94. Techniques to Study Cellular Response in Critical Size Bone Defect Healing on Rat Calvaria Treated with Hydroxyapatite Implants
- Author
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de Freitas Costa, Neusa Motta, Raposo Melo, Bruno, Tavares Brito, Rosana, de Oliveira Fernandes, Gustavo Vicentis, Bernardo, Vagner Gonçalves, Carvalho da Fonseca, Eliene, Conz, Márcio Baltazar, de Almeida Soares, Glória D., and Granjeiro, José Mauro
- Abstract
The aim of this paper was to evaluate the usefulness of coupling digital image analysis with immunohistochemistry and histomorphometry data to the study of tissue response to hydroxyapatite in a model of critical size bone defect in calvaria of rats. A transosseous defect measuring 8 mm in diameter was performed with a surgical trephine in the parietal bone of 40 rats and divided into two experimental groups according to the treatment: group I (blood clot, control), group II (HA) and killed 1, 3, 6 and 9 months after implantation (n=5/group/period). The skullcaps with overlaying skin were collected and processed for paraffin embedding. The specimens were cut in the laterolateral direction into 5-µm thick semi-serial sections and stained with hematoxylin-eosin for identification and counting of polymorphonuclears cells, mastocytes, and multinucleated giant cells, MNG, or immunolabeled with anti- lysozyme, -factor VIII and –PCNA. Digital images were obtained and analyzed with the ImagePro-Plus® software for cell couting (polymorphonuclears cells, mastocytes, macrophages and MNG) and microvessel density. Image segmentation of anti-PCNA immunostaining was used for cell proliferation analysis. The digital images obtained allowed clear identification of cells of interest by through morphological aspects or immunostaining. Data recording and analysis was facilitated by the use of specific software for image processing and graphical and statistical analysis. It can be concluded that the techniques applied were usefull to identify and count cells, structures and process of interest making easier the effectiveness of hydroxyapatite in the critical size defect in rat calvaria model.
- Published
- 2008
- Full Text
- View/download PDF
95. Placement, Performance and Complications of the Ash Split Cath™Hemodialysis Catheter
- Author
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Gallieni, M., Conz, P.A., Rizzioli, E., Butti, A., and Brancaccio, D.
- Abstract
A tunneled catheter is the alternative vascular access for those patients in need of hemodialysis who cannot undergo dialysis through an arterio-venous fistula or a vascular graft.This study was undertaken to evaluate the performance of the Ash Split Cath™, a 14 French chronic hemodialysis catheter with D-shaped lumens and a Dacron®cuff. After tunneling through a transcutaneous portion the catheter enters the venous system, where it splits into two separate limbs.Data regarding catheter positioning, function and adequacy of dialysis were collected from two hemodialysis facilities. Twenty-eight Ash-split catheters were placed in 28 patients, with no complications, and immediate technical success was 100%.Patients were followed up for a total of 7,286 catheter days. No catheter-related infections were observed. Only one catheter failed after 15 days, with a primary catheter patency of 96% for the whole study length. Mean blood flow was 303 ± 20 ml/min at 1 week after insertion, 306 ± 17 ml/min at 3 months, 299 ± 44 ml/min at 6 months, and 308 ± 16 ml/min at 12 months. With a mean dialysis session duration of 234 ± 25 minutes, adequate dialysis dose was observed for 96% of catheters, as reflected by a mean urea reduction ratio (URR) of 71%±8 or a mean urea kinetic modeling, or Kt/V, value of 1.51±0.3 during follow up. In conclusion, compared with previous studies we report the best permanent catheter performance, confirming that the Ash-split catheter is a good alternative for vascular access in hemodialysis patients who are not candidates for surgical A-V fistula or graft placement.
- Published
- 2002
- Full Text
- View/download PDF
96. Determination of trans-Resveratrol Concentrations in Brazilian Red Wines by HPLC
- Author
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Souto, André A., Carneiro, Manuel C., Seferin, Marcus, Senna, Marcos J.H., Conz, Andressa, and Gobbi, Kristiane
- Abstract
The levels of trans-resveratrol in 36 commercial red wines produced in the southern region of Brazil have been measured using a direct injection isocratic UV-HPLC method. The concentration of trans-resveratrol ranged from 0.82 to 5.75 mg/L with a mean value of 2.57 mg/L (R.S.D.%=1.99).
- Published
- 2001
- Full Text
- View/download PDF
97. The Prophylactic Effects of Natural Water-Soluble Antioxidant from Spinach and Apocynin in a Rabbit Model of Lipopolysaccharide-Induced Endotoxemia
- Author
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Lomnitski, Liat, Carbonatto, Michela, Ben-Shaul, Varda, Peano, Sergio, Conz, Angelo, Corradin, Lorena, Maronpot, Robert R., Grossman, Shlomo, and Nyska, Abraham
- Abstract
Radical-scavenging antioxidants, as part of the cellular defense system, function to inhibit the formation and propagation of free radicals and active oxygen species formation. In previous studies we demonstrated that endotoxin lipopolysaccharide (LPS) promotes oxidative stress and associated pathological changes in a rat model and that use of selected antioxidants was effective in reducing LPS-related lipid peroxidation product formation in the liver, as well as LPS-related pathological changes in different organs. In this study, several toxicological parameters (ie, clinical signs, blood chemistry, and histopathological changes) were compared among groups of male New Zealand rabbits injected with LPS following prophylactic pretreatment with either of 2 antioxidants, a group injected with LPS without pretreatment with antioxidants, groups injected with either of the 2 antioxidants only, and an untreated control group. The antioxidants used were a water-soluble natural antioxidant (NAO) from spinach and the NADPH oxidase inhibitor, apocynin. Exposure to LPS alone was associated clinically with depression, tachypnea, outer ear vasodilation, and iris congestion; biochemically with a significant increase in blood total bilirubin, transaminase activity, and glucose, total cholesterol, and triglyceride levels; macroscopically with multiple whitish areas in the liver; and histologically with hepatocellular focal necrosis and acute inflammation, thymic and splenic lymphoid necrosis and depletion, acute uveitis and hemorrhages in the ciliary processes, and decreased adrenal cortical cytoplasmic vacuolation considered consistent with depletion of steroidal hormone contents. The NAO had more effective prophylactic capacities than the apocynin. The protective effects were obvious in all investigated parameters. The results indicate the possible therapeutic efficacy of NAO in the treatment of clinical endotoxemia associated with gram-negative bacterial sepsis that is known to be associated with oxidative stress.
- Published
- 2000
- Full Text
- View/download PDF
98. Integration of Peritoneal Dialysis in Active Uremia Treatment
- Author
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Ronco, Claudio, Conz, Piero, Bragantini, Luisa, Dell'Aquila, Roberto, Crepaldi, Carlo, Dissegna, Daniela, Gastaldon, Fiorella, and La Greca, Giuseppe
- Published
- 1996
- Full Text
- View/download PDF
99. The Concept of Adequacy in Peritoneal Dialysis
- Author
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Ronco, Claudio, Conz, Piero, Agostini, Francesco, Bosch, Juan P., Lew, Susy A., and La Greca, Giuseppe
- Abstract
The aim of renal replacement therapy is to obtain blood purification from metabolic waste products sufficient to achieve patient rehabilitation, the control of dry body weight, and the correction of acid base and electrolyte imbalances (1–3).Among these, the correction of the hormonal imbalances as a result of renal disease would also be required (4). However, this is difficult to achieve, and the majority of substitute therapies such as hemodialysis and peritoneal dialysis focus on blood purification and fluid and electrolyte homeostasis.For this reason the search for the optimal dialytic therapy has been limited to the possibility of achieving a treatment that could at least be adequate in terms of blood purification and patient rehabilitation. Therefore, dialysis adequacy has been selected as a term to indicate successful renal replacement therapy, one that could overcome most of the uremic symptoms and allow the patient to reach a sufficient degree of rehabilitation, even though the treatment is far from the complete and optimal substitution of the lost kidney function in its whole.In recent years the concept of dialysis adequacy has been studied by several authors, and a continuous evolution of this concept has been observed. From the original description of the square-meter-hour hypothesis of Babb and Scribner in 1971 (5), a series of new studies led to the clinical application of various indices devoted to describing the level of efficiency achieved by dialysis treatment (6,7). Finally, after the American National Cooperative Dialysis Study was analyzed, and the KTNindex was selected as a marker for dialysis adequacy, the majority of authors now rely on this index and are proposing various formulas for its calculation (8–11).
- Published
- 1994
- Full Text
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100. Pathophysiology of Ultrafiltration in Peritoneal Dialysis
- Author
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Ronco, Claudio, Feriani, Mariano, Chiaramonte, Stefano, Brendolan, Alessandra, Bragantini, Luisa, Conz, Piero, Dell'Aquila, Roberto, Milan, Massimo, and La Greca, Giuseppe
- Abstract
Pathophysiology of peritoneal ultrafiltration is analyzed in the present study. Peritoneal equilibration test is the easiest procedure to study in detail the possible causes of failure to control the ultrafiltration rate in patients undergoing peritoneal dialysis. Membrane failure, reduction in peritoneal blood flow, excessive lymphatic reabsorption catheter malposition, and fluid sequestration are the most common causes of ultrafiltration loss. Pharmacologic manipulation of peritoneal membrane, correction of mechanical inconvenients, reduction in peritonitis rate and in the level of immunostimulation of the mesotelial macrophages, together with a careful policy in terms of glucose concentration in the dialysate and dwell times may contribute not only to treat different forms of ultrafiltration loss but also to prevent their incidence.
- Published
- 1990
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