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Introduction: Intradialytic hypertension with a prevalence of 15% among hemodialysis patients is with unknown pathophysiology, demographic, laboratoiy and clinical characteristic of patients, and it's influence on longtenn clinical effects (cardiovascular morbidity and mortality, rate of hospitalization). The aim of the study is to present the clinical, laboratoiy and demographic characteristics of patients with intradialytic hypertension in our dialysis center., Materials and Methods: Out of 110 hemodialysis patients, 17 patients (15,45%) had intradialytic hypertension - started at a systolic pressure greater than 140 nun Hg or had an increase in systolic pressure more than 10 mm Hg during the session, and 17 patients were nonnotensive or had a drop in blood pressure dining the dialysis. HD were performed 3 times per week with a duration of 4-5 hours, on machines with controlled ultrafiltration and high flux syntetic membrane (polyetersulfon) sterilized with gamma rays. A dialysate with standard electrolytes content was used (Na(+) 138 mmol/L, K(+) 2,0 mmol/L, Ca(++) 1,5 mmol/L, Mg (+)1,0 mmol/L, CH(3)COO(-) 3,0 mmol/L, Cl -110 mmol/1, HCO(3)(-) 35 mmol/L). We analysed the following demographic and clinical characteristics: gender, age, BMI, dialysis vintage, vascular acces, cardiovascular comorbidity (cardiomyopathy, ischemic cardiac disease, peripheral artery disease, heart valve disease), number and type of antihypertensive drugs, weekly dose of erythropoesis - stimulating agent, standard monthly, three and six months laboratoiy analyzes, and sp Kt/V and PCR. Statistical analysis was performed using the statistical software SPSS 17.0., Results: hi both groups men were predominant (IDH group 88.23%, control group 64.07%). The IDH group was older (59.00 ± 7.64 versus 49.00 ± 13.91, p = 0.314) and with lower BMI (p = 0.246) compared to the control group. The DDH patients had significantly lower serum sodium and higher sodium gradient (135.75 ± 2.03 versus 137.33 ± 1.97, p = 0.042; 2.25 ± 1.98 versus 0.66 ± 1.44, p = 0.0267, respestively). All other laboratoiy findings showed no statistically significant differences between the two groups. The IDH group had significantly higher interdialysis weight gain and less effective ultrafiltration individually at each dialysis session compared to the control group (2.23 ± 0.866 versus 2.37 ± 0.69, p = 0.011; 3.87 ± 1,26 versus 3.56 ± 1.18, p = 0.025, respectively). The systolic and mean arterial pressure after the HD were statistically higher in the IDH group., Conclusion: Older age, lower BMI, borderline hyponatremia, higher sodium gradient and smaller ultrafiltration rate are the clinical characteristics of patients with intradialytic hypertension.

The fast development of nephrology in the world, especially in the second half of the 20 th century demanded protocol (guidelines) for nephrological activity for all levels of medical care, of doctors and specialists. The International Society of Nephrology, the European Renal Association and other national associations created their own protocol (guidelines) for nephrological activity. The Macedonian Society of Nephrology, Dialysis, Transplantation and Artificial Organs (MSNDTAO) proclaimed the First Protocol for Performing Nephrological Activity in the Republic of Macedonia at the First Congress of the MSNDTAO, held in Ohrid 1993, and it was published in the Macedonian Medical Review, 1994; Supplement 14: 397-406 [1]. The update of the Protocol for Performing Nephrological Activity in the Republic of Macedonia was proclaimed at the Fourth Congress of MSNDTAO, held in Ohrid 2012 and it presented in this text.

Introduction: Total dialysate calcium concentration has an important influence on calcium metabolism in bicarbonate high-flux dialysis. The aim of the study is to investigate the influence of different dialysate calcium concentrations on serum concentration of ionised calcium and on the balance of total dialysate calcium., Materials and Methods: A total of 20 stable aneuric patients on chronic bicarbonate high-flux haemodialysis with a frequency of 4 hours, 3 times per week with two different concentrations of total dialysate calcium (tdCa) were included in the study. Dialysis in the first session was performed with total dialysate calcium of 1.25 mmol/L, and at the next session with dialysate calcium of 1.5 mmol/L. The serum concentrations of total and ionized calcium were determined before and after each dialysis session. The balance of total dialysate calcium was measured on the dialysate side., Results: Serum concentration of total calcium before and after haemodialysis did not show any significant difference in HD with a total dialysate calcium of 1.25 mmol/L (2.40 ± 0.19 mmol/L before HD and 2.46 ± 0.15 mmol/L after HD). Serum ionized calcium in HD with tdCa 1.25 significantly decreased after HD (1.16 ± 0.09 mmol/L before HD to 1.08 ± 0.04 mmol/after HD, p < 0.05). The total serum calcium significantly increased after HD in comparison to HD with tdCa of 1.5 mmol/L (2.40 ± 0.15 mmol/L to 2.65 ± 0.16 mmol/L, p < 0.05). The concentration of serum ionized calcium did not increase significantly in HD with tdCa 1.50 mmol/L (1.16 ± 0.08 mmol/L to 1.20 ± 0.05 mmol/L). Average values of total dialysate calcium balance (gradient of diffusion between dialysate and patient) were negative in tdCa 1.25 (1.38 ± 0.08 mmol/L versus 1.48 ± 0.43 mmol/L), but in HD with tdCa 1.5 were slightly positive (1.56 ± 0.07 mmol/L versus 1.52 ± 0.07)., Conclusion: The use of total dialysate calcium of 1.5 mmol/L is beneficial because balance values of total dialysate calcium are slightly positive, but serum concentration of ionized calcium stays in the normal range.