19 results on '"Hong-Kui Yu"'
Search Results
2. Pelvic Ultrasound in Diagnosing and Evaluating the Efficacy of Gonadotropin-Releasing Hormone Agonist Therapy in Girls With Idiopathic Central Precocious Puberty
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Hong-kui Yu, Xiao Liu, Jia-kun Chen, Shan Wang, and Xian-yue Quan
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ultrasonography ,uterus ,ovary ,isosexual precocity ,sexual characteristics ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Background and Objective: Idiopathic central precocious puberty (ICPP) is characterized by early pubertal changes, the acceleration of growth velocity, and rapid bone maturation that often results in reduced adult height. Gonadotrophin-releasing hormone agonist (GnRHa) is currently considered to be an effective therapeutic agent. At present, GnRH stimulation test is adopted as a gold standard for the diagnosis of ICPP and the efficacy evaluation of GnRHa therapy. However, it is difficult to operate in practice due to the cumbersome procedures and multiple blood samples required. This study was conducted to establish the value of pelvic ultrasound in diagnosing ICPP and evaluating the efficacy of GnRHa therapy.Materials and Methods: One hundred and twenty-two girls with ICPP (ICPP group) were enrolled in the study. Pelvic ultrasound and levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) were examined before and after GnRHa therapy for 3 months. Eighty normal prepubertal girls were enrolled as the control group. The difference in pelvic ultrasound parameters between the ICPP group before GnRHa therapy and the control group was compared by independent-sample t-test, while paired t-test for ICPP group before and after GnRHa therapy. Receiver operating characteristic (ROC) curve was used to explore the optimal pelvic ultrasound parameters for diagnosing ICPP. Pearson correlation analysis was performed between the pelvic ultrasound parameters and serum sexual hormone level.Results: The pelvic ultrasound parameters (length of the uterine body, anteroposterior diameter of the uterine body, transverse diameter of the uterine body, volume of the uterine body, uterine body-cervix ratio, length of the ovary, transverse diameter of the ovary, anteroposterior diameter of the ovary, volume of the ovary, number of increased follicles and maximum diameter of the follicle) in the ICPP group before GnRHa therapy were significantly larger than those of the control group (P < 0.05). All the above pelvic ultrasound parameters in the ICPP group were significantly decreased after GnRHa therapy compared with those before treatment (P < 0.05). The volume of the uterine body had the largest area under the ROC curve in differentiating between patients with ICCP and the control group. Pelvic ultrasound parameters were significantly correlated with serum sexual hormone levels (P < 0.05).Conclusion: This study indicates pelvic ultrasound is a simple and reliable tool to diagnose ICPP and evaluates the efficacy of GnRHa therapy by dynamically observing the morphology of internal genitalia. The volume of uterine body was the best ultrasound parameter to distinguish patients with ICPP from normal girls.
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- 2019
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3. Atropine Premedication Facilitates Ultrasound-Guided Reduction by Saline Enema in Children With Intussusception
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Xiao Liu, Bei Xia, Hong-kui Yu, Lie-zhen Hu, Shu-min Fan, Dong Xiao, Li-xian Gu, Jia-kun Chen, Zhi-bo Wen, and Xiao-peng Ma
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intussusception ,atropine ,enema ,ultrasound ,children ,Therapeutics. Pharmacology ,RM1-950 - Abstract
Background and Objective: Intussusception is the most frequent pediatric abdominal emergency. Intestinal spasm, ischemia, necrosis and even death may occur without prompt diagnosis and treatment. The ultrasound-guided reduction by saline enema is a preferred non-surgical procedure for intussusception. Muscular relaxants can relieve the intestinal spasm and edema by relaxing the intestinal smooth muscle, which may facilitate the treatment of intussusception. However, controversy persists on whether muscular relaxants are effective in the procedure. Therefore, the purpose of our study was to assess the efficacy of atropine known as a muscular relaxant in ultrasound-guided reduction by saline enema in children with intussusception.Methods: All patients with intussusception diagnosed and treated in our department from July 2016 to February 2018 were included. Four hundred and thirty-seven children were enrolled and randomly divided into two groups: an atropine group and a control group. Intramuscular atropine at a dose of 0.02 mg per kilogram of body weight was administrated 15 min before ultrasound-guided reduction by saline enema in the atropine group. In the control group, the ultrasound-guided reduction was performed without using any muscular relaxants. The success rate, duration of the reduction, volume of saline, maximum intra-rectal pressure and complications were recorded and compared between the two groups.Results: The success rate was 95.9% (212 out of 221) and 94.9% (205 out of 216) in the atropine group and the control group, respectively. No significant difference was observed in the success rate between the two groups (P > 0.05). The duration of reduction was significantly lower in the atropine group than in the control group (P < 0.01). The volume of saline was also significantly lower in the atropine group than in the control group (P < 0.05). The maximum intra-rectal pressure showed no difference between the two groups (P > 0.05).Conclusion: Atropine premedication can facilitate ultrasound-guided reduction by saline enema in children with intussusception, by reducing the duration of reduction and the volume of saline in the procedure.
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- 2019
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4. Adiponectin increases secretion of rat submandibular gland via adiponectin receptors-mediated AMPK signaling.
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Chong Ding, Li Li, Yun-Chao Su, Ruo-Lan Xiang, Xin Cong, Hong-Kui Yu, Sheng-Lin Li, Li-Ling Wu, and Guang-Yan Yu
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Medicine ,Science - Abstract
Adiponectin and adiponectin receptors (AdipoR1/2) are expressed in various tissues and are involved in the regulation of multiple functions such as energy metabolism and inflammatory responses. However, the effect of adiponectin and AdipoRs in submandibular glands has not been fully evaluated. In the present study, we found that mRNA and protein of both adiponectin and AdipoR1/2 were expressed in rat submandibular glands and in the SMG-C6 cell line, as evidenced by RT-PCR and Western blot analysis. Immunofluorescence staining showed that adiponectin was diffused in the cytoplasm, while AdipoR1/2 was concentrated in the membrane of acinar cells. Saliva flow was significantly increased by full length adiponectin (fAd) or globular adiponectin (gAd) perfusion in isolated rat submandibular glands. 5-Aminoimidazole-4-carboxamide-1-4-ribofuranoside (AICAR), an adenosine monophosphate activated protein kinase (AMPK) activator, also increased saliva secretion. fAd, gAd, and AICAR all increased the average width of apical tight junctions in perfused submandibular glands, and decreased transepithelial electrical resistance (TER) in SMG-C6 cells, suggesting that adiponectin promoted secretion by modulating paracellular permeability. fAd and gAd increased p-AMPK levels, while AraA, an AMPK antagonist, abolished fAd- and gAd-induced changes in secretion, tight junction ultrastructure, and TER. Moreover, both AdipoR1 and AdipoR2 were required for fAd- or gAd-induced p-AMPK and TER responses, suggesting from their inhibition following AdipoR1 or AdipoR2 knockdown, and co-knockdown of AdipoRs by RNA interference. Our results suggest that adiponectin functions as a promoter of salivary secretion in rat submandibular glands via activation of AdipoRs, AMPK, and paracellular permeability.
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- 2013
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5. Quantitative evaluation of passive muscle stiffness by shear wave elastography in healthy individuals of different ages
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Hong-Kui Yu, Zhibo Wen, Shu-Ya Sheng, Min Pan, Hao Lu, Rui-Yun Chen, Si-Min Liang, and Xiao Liu
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Adult ,medicine.medical_specialty ,Passive stretching ,030218 nuclear medicine & medical imaging ,Shear modulus ,03 medical and health sciences ,0302 clinical medicine ,Healthy volunteers ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Range of Motion, Articular ,Child ,Muscle, Skeletal ,Aged ,Aged, 80 and over ,Orthodontics ,Shear wave elastography ,business.industry ,General Medicine ,Middle Aged ,Muscle stiffness ,musculoskeletal system ,Shear (sheet metal) ,medicine.anatomical_structure ,030220 oncology & carcinogenesis ,Healthy individuals ,Elasticity Imaging Techniques ,Radiology ,Ankle ,business ,Ankle Joint - Abstract
To investigate age-related changes on passive muscle stiffness in healthy individuals and measure the shear modulus in different age groups. Shear wave elastography (SWE) movies of gastrocnemius medialis (GM) were collected during passive stretching induced by ankle rotation from plantarflexion (PF) to dorsiflexion (DF). A series of SWE images at ankle angles of PF 40°, PF 30°, PF 20°, PF 10°, 0°, DF 10°, DF 20°, and DF 30° were collected and shear moduli measured accordingly for analyses. Eighty-six healthy volunteers (27 children, 31 middle-aged adults, and 28 older people) were recruited. No significant difference was observed in the shear modulus between the three groups at ankle angles of PF 40°, PF 30°, PF 20°, PF 10°, and 0° (p > 0.05). The difference in the shear modulus among the three groups became significant as DF increased. At ankle angles of DF 10°, DF 20°, and DF 30°, the shear modulus was the greatest in the older group, followed by the middle-aged group and then the children group (p = 0.007, 0.000, and 0.000, respectively). Passive muscle stiffness increases with age, and the difference between age groups was pronounced only after reaching a certain degree of stretching. • The influence of age on passive muscle stiffness becomes pronounced only after reaching a certain degree of stretching. • Age should be considered when evaluating passive muscle stiffness in muscular disorders.
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- 2020
6. Performance of Passive Muscle Stiffness in Diagnosis and Assessment of Disease Progression in Duchenne Muscular Dystrophy
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Hong-Kui Yu, Xiao Liu, Min Pan, Jin-Wei Chen, Chen Liu, Yu Wu, Zhi-Bin Li, and Hong-Ying Wang
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Male ,Muscular Dystrophy, Duchenne ,Acoustics and Ultrasonics ,Radiological and Ultrasound Technology ,Biophysics ,Disease Progression ,Elasticity Imaging Techniques ,Humans ,Radiology, Nuclear Medicine and imaging ,Muscle, Skeletal ,Ankle Joint - Abstract
The aim of this study was to evaluate the performance of passive muscle stiffness in diagnosing and assessing disease progression in Duchenne muscular dystrophy (DMD). Boys with DMD and age-matched controls were recruited. Shear wave elastography (SWE) videos were collected by performing dynamic stretching of the gastrocnemius medius (GM). At ankle angles from plantar flexion (PF) 30° to dorsiflexion (DF) 20°, the shear modulus of the GM was measured for each 10° of ankle movement. Shear modulus at each ankle angle was compared between the DMD and control group. Correlation between passive muscle stiffness and motor function grading was also analyzed. A total of 26 patients with DMD and 20 healthy boys were enrolled. At multiple stretch levels, passive muscle stiffness of the GM was significantly higher in patients with DMD than in those in the control group (all p values0.05). The shear modulus of GM at an ankle angle of DF 10° had the largest area under the receiver operating characteristic curve in differentiating DMD patients from normal subjects (AUC = 0.902, 95% confidence interval: 0.814-0.990). Motor function grading was a significant determinant of passive muscle stiffness at an ankle angle of DF 10° (B = 21.409, t = 3.372, p = 0.003). Passive muscle stiffness may potentially serve as a useful non-invasive tool to monitor disease progression in DMD patients.
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- 2021
7. Measurement consistency of dynamic stretching muscle stiffness evaluated using shear wave elastography: comparison among different stretched levels and ROI sizes
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Hong-Kui Yu, Xiao Liu, Si-Min Liang, Shu-Ya Sheng, Li-Xian Gu, Pei Fu, Min Pan, and Hao Lu
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Acoustics and Ultrasonics ,Radiological and Ultrasound Technology ,medicine.diagnostic_test ,biology ,business.industry ,Reproducibility of Results ,Passive stretching ,Repeatability ,Muscle stiffness ,biology.organism_classification ,Dynamic stretching ,Shear modulus ,Medius ,Region of interest ,Muscle Stretching Exercises ,medicine ,Elasticity Imaging Techniques ,Humans ,Radiology, Nuclear Medicine and imaging ,Elastography ,business ,Muscle, Skeletal ,Ankle Joint ,Biomedical engineering - Abstract
Aim: To investigate the reliability of quantitative analysis of dynamic stretching muscle stiffness using shear wave elas- tography (SWE), and to evaluate the influence of stretched levels and region of interest (ROI) sizes on the repeatability of SWE measurements. Materials and methods: SWE videos of the gastrocnemius medius were collected during ankle movement from plantar flexion (PF) 40° to dorsiflexion (DF) 30°. Shear wave images were collected of ankle angles at PF 25°, 0°, DF 15°, and DF 30°, representing the slack status, mildly stretched level, moderately stretched level, and maximal stretched level of the gastrocnemius medius, respectively. ROI circles with diameters of 2 mm, 5 mm, and 8 mm were applied to measure the shear modulus. Intra-observer, and inter-observer repeatability of the measurements were compared among different stretched levels and ROI sizes. Results: Twenty-one healthy volunteers were enrolled. Muscle stiffness increased as the ankle DF increased. Intraclass correlation coefficients (ICCs) of intra-observer and inter-observer repeatability obtained for ROI sizes of 2 mm, 5 mm and 8 mm indicated good to excellent repeatability at all stretched levels. Conclusions: Shear wave elastography appeared to be a reliable tool to evaluate the dynamic stretching muscle stiffness with satisfactory repeatability at various stretched levels of gastrocnemius medius. Good to excellent repeatability was found using different ROI sizes.
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- 2021
8. Effect of computed tomographic venography on donor selection in submandibular gland transplantation in patients with severe dry eye
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Zhi-Gang Cai, Guang-Yan Yu, Zhipeng Sun, Xiao-Jing Liu, Jia-Zeng Su, Lan Lv, and Hong-Kui Yu
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Adult ,Male ,medicine.medical_specialty ,Submandibular Gland ,Venography ,Anastomosis ,Severity of Illness Index ,Donor Selection ,Young Adult ,03 medical and health sciences ,0302 clinical medicine ,stomatognathic system ,Anterior Facial Vein ,Humans ,Medicine ,Prospective Studies ,Vein ,Computed tomography angiography ,medicine.diagnostic_test ,business.industry ,Donor selection ,Superficial Temporal Vein ,Phlebography ,030206 dentistry ,Transplantation ,medicine.anatomical_structure ,Otorhinolaryngology ,030221 ophthalmology & optometry ,Dry Eye Syndromes ,Female ,Surgery ,Radiology ,Oral Surgery ,Tomography, X-Ray Computed ,business - Abstract
Background A reliable anterior facial vein (AFV, donor vein) is cardinal for the success of submandibular gland (SMG) transplantation. This study determined the impact of computed tomographic (CT) venography in identifying AFV variations for SMG transplantation. Methods CT venography was performed in consecutive patients with severe dry eye prior to SMG transplantation in order to identify disadvantageous AFV variations for vascular anastomosis, namely, AFVs that did not drain the SMG and those that did not match the superficial temporal vein (STV, recipient vein; AFV:STV caliber ratio, ≥3). The CT results were compared with the intraoperative findings for the diagnostic accuracy. Results Forty-two donors were included. Compared with the intraoperative findings, the CT results accurately identified AFV–STV caliber mismatches ( P = 1.00; sensitivity and specificity, 100%). In the identification of AFVs not draining the SMG, CT showed 94.7% sensitivity and 100% specificity ( P = 0.25). According to the CT findings, 10 contralateral SMGs with AFVs (23.8%), instead of ipsilateral donors, were selected for transplantations (conventionally ipsilateral donor was the first choice). The surgical success rate was 95.2% (40/42). Conclusion CT venography is valuable in determining disadvantageous AFV variations for anastomosis and choosing a reliable donor for SMG transplantation.
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- 2017
9. Measurement consistency of dynamic stretching muscle stiffness evaluated using shear wave elastography: comparison among different stretched levels and ROI sizes.
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Xiao Liu, Hong-Kui Yu, Shu-Ya Sheng, Si-Min Liang, Hao Lu, Li-Xian Gu, Pei Fu, Min Pan, Liu, Xiao, Yu, Hong-Kui, Sheng, Shu-Ya, Liang, Si-Min, Lu, Hao, Gu, Li-Xian, Fu, Pei, and Pan, Min
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SHEAR waves , *MODULUS of rigidity , *INTRACLASS correlation , *ELASTOGRAPHY , *MUSCLES , *ANKLE - Abstract
Aim: To investigate the reliability of quantitative analysis of dynamic stretching muscle stiffness using shear wave elas-tography (SWE), and to evaluate the influence of stretched levels and region of interest (ROI) sizes on the repeatability of SWE measurements.Materials and Methods: SWE videos of the gastrocnemius medius were collected during ankle movement from plantar flexion (PF) 40° to dorsiflexion (DF) 30°. Shear wave imageswere collected of ankle angles at PF 25°, 0°, DF 15°, and DF 30°, representing the slack status, mildly stretched level, moderately stretched level, and maximal stretched level of the gastrocnemius medius, respectively. ROI circles with diameters of 2 mm, 5 mm, and 8 mm were applied to measure the shear modulus. Intra-observer, and inter-observer repeatability of the measurements were compared among different stretched levels and ROI sizes.Results: Twenty-one healthy volunteers were enrolled. Muscle stiffness increased as the ankle DF increased. Intraclass correlation coefficients (ICCs) of intra-observer and inter-observer repeatability obtained for ROI sizes of 2 mm, 5 mm and 8 mm indicated good to excellent repeatability at all stretched levels.Conclusions: Shear wave elastography appeared to be a reliable tool to evaluate the dynamic stretching muscle stiffness with satisfactory repeatability at various stretched levels of gastrocnemius medius. Good to excellent repeatability was found using different ROI sizes. [ABSTRACT FROM AUTHOR]- Published
- 2021
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10. Right and left ventricular mechanics and interaction late after balloon valvoplasty for pulmonary stenosis
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Sophia J. Wong, Yiu-fai Cheung, Hong-kui Yu, and Shu-juan Li
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Adult ,Balloon Valvuloplasty ,Male ,medicine.medical_specialty ,Adolescent ,Heart Ventricles ,Echocardiography, Three-Dimensional ,Diastole ,Speckle tracking echocardiography ,Balloon ,Internal medicine ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Systole ,Child ,Ejection fraction ,business.industry ,General Medicine ,medicine.disease ,Echocardiography, Doppler, Color ,Pulmonary Valve Stenosis ,Stenosis ,Treatment Outcome ,Pulmonary valve stenosis ,Cardiology ,Female ,Pulmonary Valve Insufficiency ,Cardiology and Cardiovascular Medicine ,business - Abstract
Aims This study sought to explore right (RV) and left ventricular (LV) mechanics and ventricular–ventricular interaction in adolescents and young adults late after percutaneous balloon pulmonary valvoplasty (PBPV) for valvar pulmonary stenosis (PS). Methods and results Potential late effects of PS despite PBPV on cardiac mechanics have not been well defined. Thirty-one patients aged 20.2 ± 7.6 years were studied at 18 ± 6 years after PBPV. Ventricular myocardial deformation was determined using speckle tracking echocardiography, while RV and LV volumes and ejection fraction as well as LV systolic dyssynchrony index were assessed by three-dimensional echocardiography. The results were compared with those of 30 controls. Pulmonary regurgitation, mostly trivial to mild, was present in 90% (28/31) of patients. Compared with controls, patients had significantly greater RV end-diastolic ( P < 0.001), RV end-systolic ( P < 0.001), and LV end-systolic ( P = 0.04) volumes as well as lower LV ejection fraction ( P < 0.001). For deformation, patients had significantly reduced RV longitudinal systolic strain ( P = 0.004), decreased LV circumferential systolic strain ( P < 0.001), and strain rate ( P = 0.001) as well as greater LV mechanical dyssynchrony ( P < 0.001). In patients, RV end-diastolic and end-systolic volumes correlated with LV circumferential strain ( r = −0.47, P = 0.008 and r = −0.36, P = 0.049, respectively) and dyssynchrony ( r = 0.53, P = 0.002 and r = 0.49, P = 0.005, respectively). Patients who had PBPV at age ≤1 year had ventricular deformation indices similar to those who had interventions beyond 1 year. Conclusion Impaired RV and LV mechanics and adverse ventricular–ventricular interaction occur in adolescents and young adults late after balloon valvoplasty for isolated valvar PS.
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- 2014
11. New Three-Dimensional Speckle-Tracking Echocardiography Identifies Global Impairment of Left Ventricular Mechanics with a High Sensitivity in Childhood Cancer Survivors
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Wei Yu, Godfrey Chi-Fung Chan, Hong-kui Yu, Yiu-fai Cheung, Daniel K. L. Cheuk, and Sophia J. Wong
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Male ,China ,medicine.medical_specialty ,Adolescent ,Drug-Related Side Effects and Adverse Reactions ,Childhood cancer ,Echocardiography, Three-Dimensional ,Antineoplastic Agents ,Speckle tracking echocardiography ,Comorbidity ,Sensitivity and Specificity ,Ventricular Dysfunction, Left ,Young Adult ,Risk Factors ,Neoplasms ,Internal medicine ,Prevalence ,Humans ,Medicine ,Cutoff ,Anthracyclines ,Radiology, Nuclear Medicine and imaging ,Survivors ,Derivation ,Ventricular mechanics ,Ejection fraction ,Receiver operating characteristic ,business.industry ,Reproducibility of Results ,Treatment Outcome ,Cardiology ,Elasticity Imaging Techniques ,Time to peak ,Female ,Cardiology and Cardiovascular Medicine ,business - Abstract
Background: The aim of this case-control study was to assess the usefulness of three-dimensional (3D) speckle-tracking echocardiography in the evaluation of global left ventricular (LV) myocardial performance in adolescent and adult survivors of childhood cancers. Methods:Fifty-threeanthracycline-treated survivorsofchildhoodcancers(meanage,18.665.1years)and38 controls were studied. Three-dimensional speckle-tracking echocardiography was performed to assess LV 3D global and segmental strain, time to peak segmental 3D strain, LV torsion, and ejection fraction. LV systolic dyssynchrony index (SDI) was calculated as the percentage of the standard deviation of times to peak strain of the 16 segments divided by the RR interval. A global performance index (GPI) was calculated as (global 3D strain torsion)/SDI. The area under the receiver operating characteristic curve was calculated to determine the capability of various echocardiographic indices to discriminate between patients and controls. Results: Compared with controls, patients had significantly reduced LV global 3D strain (P < .001), torsion (P < .001), and GPI (P < .001) and greater SDI (P < .001). All except the basal anteroseptal segment in patients had reduced regional 3D strain compared with controls (P < .05 for all). Global 3D strain (P = .018), SDI (P = .003), and GPI (P = .02) were correlated with cumulative anthracycline dose. The areas under the curves for GPI, global 3D strain, 1/SDI, torsion, and ejection fraction were 0.92, 0.79, 0.79, 0.79, and 0.78, respectively. A GPI cutoff of 10.6/cm had sensitivity of 84.9% and specificity of 81.6% of differentiating patients from controls. Conclusions: Three-dimensional speckle-tracking echocardiography enables the derivation of an index of LV global performance that incorporates LV 3D strain, dyssynchrony, and torsion for the sensitive detection of altered LV mechanics in childhood cancer survivors. (J Am Soc Echocardiogr 2013;26:846-52.)
- Published
- 2013
12. Atrial mechanics after surgical repair of tetralogy of Fallot
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Sophia J. Wong, Yiu-fai Cheung, Jia Hou, and Hong-kui Yu
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Male ,medicine.medical_specialty ,Adolescent ,Diastole ,Speckle tracking echocardiography ,Doppler imaging ,Right atrial ,Ventricular Dysfunction, Left ,Left atrial ,Internal medicine ,Medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Heart Atria ,Tetralogy of Fallot ,Cardiac cycle ,business.industry ,Cardiovascular Surgical Procedures ,Mechanics ,Plastic Surgery Procedures ,medicine.disease ,Both atria ,Treatment Outcome ,Echocardiography ,Cardiology ,Elasticity Imaging Techniques ,Female ,Cardiology and Cardiovascular Medicine ,business - Abstract
Background Ventricular diastolic dysfunction in patients with repaired tetralogy of Fallot (TOF) may affect atrial mechanics. This study aimed to explore right atrial (RA) and left atrial (LA) mechanics in repaired TOF patients and their relationship with ventricular diastolic function. Methods Fifty-four patients (36 males), aged 17.8 ± 8.3 years, who had undergone TOF repair at 3.9 ± 3.3 years and 40 healthy subjects aged 16.9 ± 6.3 years (P = 0.57) were studied. Right and LA peak positive, peak negative, and total strain, strain rate at ventricular systole (SRs), early diastole (SRed), and atrial contraction (SRac), and electromechanical delay were determined using speckle tracking echocardiography (STE). Ventricular diastolic function was assessed by tissue Doppler imaging and STE. Ventricular volumes and pulmonary regurgitant volume were derived from 3D echocardiography. Results Compared with controls, patients had significantly lower RA and LA peak positive and total strain, SRs, SRed, and SRac (all P
- Published
- 2014
13. Right ventricular mechanics in adults after surgical repair of tetralogy of fallot: insights from three-dimensional speckle-tracking echocardiography
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Sophia J. Wong, Yiu-fai Cheung, Wendy W.M. Lam, Shu-juan Li, Janice J K Ip, and Hong-kui Yu
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Adult ,Male ,medicine.medical_specialty ,Heart disease ,Ventricular Dysfunction, Right ,Echocardiography, Three-Dimensional ,Speckle tracking echocardiography ,Sensitivity and Specificity ,QRS complex ,Young Adult ,Internal medicine ,Elastic Modulus ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,In patient ,Cardiac Surgical Procedures ,Tetralogy of Fallot ,Ventricular mechanics ,Ejection fraction ,business.industry ,Reproducibility of Results ,Stroke Volume ,Plastic Surgery Procedures ,medicine.disease ,Treatment Outcome ,Cardiology ,Elasticity Imaging Techniques ,Female ,Stress, Mechanical ,Cardiology and Cardiovascular Medicine ,Cardiac magnetic resonance ,business - Abstract
Background The clinical relevance of evaluating right ventricular (RV) myocardial deformation in congenital heart disease is increasingly recognized. The aim of this study was to explore, using three-dimensional (3D) speckle-tracking echocardiography, RV mechanics in terms of 3D global area strain and mechanical dyssynchrony in adults with repaired tetralogy of Fallot. Methods Twenty patients (12 men) aged 24.7 ± 8.6 years and 22 age-matched controls (11 men) were studied. Global RV peak area strain and area strain–derived systolic dyssynchrony index (SDI) were determined using 3D speckle-tracking echocardiography. RV end-diastolic volume and end-systolic volume, ejection fraction (EF), and pulmonary regurgitation fraction were measured in patients using cardiac magnetic resonance. Results Coefficients of variation for intraobserver and interobserver measurements of RV global area strain were 6.1% and 7.9%, respectively, and those for SDI were 7.6% and 10.1%, respectively. Compared with controls, patients had significantly lower global area strain ( P = .005) and greater SDI ( P = .008). The prevalence of RV mechanical dyssynchrony (SDI > control mean + 2 SDs) in patients was 30%. In patients, global area strain correlated inversely with SDI ( r = −0.42, P = .04), RV end-diastolic volume ( r = −0.48, P = .032), and RV end-systolic volume ( r = −0.48, P = .031) and positively with EF ( r = −0.51, P = .02), while RV SDI correlated positively with RV end-systolic volume ( r = 0.55, P = .012), pulmonary regurgitation fraction ( r = 0.54, P = .031), and QRS duration ( r = 0.51, P = .022) and negatively with RV EF ( r = −0.62, P = .004). Multivariate analysis showed that RV EF (β = 0.22, P = .048) was a significant correlate of global area strain in patients. Conclusions In adults after tetralogy of Fallot repair, 3D RV deformation is impaired in association with RV dyssynchrony, volume overloading, and reduced EF.
- Published
- 2013
14. Adiponectin increases secretion of rat submandibular gland via adiponectin receptors-mediated AMPK signaling
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Yun-Chao Su, Li Li, Xin Cong, Sheng-Lin Li, Ruo-Lan Xiang, Guang-Yan Yu, Li-Ling Wu, Hong-Kui Yu, and Chong Ding
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Male ,Proteomics ,Anatomy and Physiology ,Gene Expression ,lcsh:Medicine ,Biochemistry ,Rats, Sprague-Dawley ,chemistry.chemical_compound ,Oral Diseases ,Molecular Cell Biology ,Electric Impedance ,Signaling in Cellular Processes ,Phosphorylation ,RNA, Small Interfering ,Receptor ,lcsh:Science ,Multidisciplinary ,Animal Models ,Submandibular gland ,Protein Transport ,medicine.anatomical_structure ,Paracellular transport ,Medicine ,Adiponectin ,Receptors, Adiponectin ,Signal Transduction ,Research Article ,Adenosine monophosphate ,medicine.medical_specialty ,Submandibular Gland ,Oral Medicine ,In Vitro Techniques ,Biology ,Cell Line ,Tight Junctions ,Model Organisms ,stomatognathic system ,Internal medicine ,medicine ,Animals ,Humans ,Secretion ,Activator (genetics) ,Adenylate Kinase ,lcsh:R ,Proteins ,AMPK ,nutritional and metabolic diseases ,Epithelial Cells ,Aquaporin 5 ,Rats ,Regulatory Proteins ,Enzyme Activation ,Endocrinology ,chemistry ,Rat ,lcsh:Q ,Digestive System ,Protein Abundance - Abstract
Adiponectin and adiponectin receptors (AdipoR1/2) are expressed in various tissues and are involved in the regulation of multiple functions such as energy metabolism and inflammatory responses. However, the effect of adiponectin and AdipoRs in submandibular glands has not been fully evaluated. In the present study, we found that mRNA and protein of both adiponectin and AdipoR1/2 were expressed in rat submandibular glands and in the SMG-C6 cell line, as evidenced by RT-PCR and Western blot analysis. Immunofluorescence staining showed that adiponectin was diffused in the cytoplasm, while AdipoR1/2 was concentrated in the membrane of acinar cells. Saliva flow was significantly increased by full length adiponectin (fAd) or globular adiponectin (gAd) perfusion in isolated rat submandibular glands. 5-Aminoimidazole-4-carboxamide-1-4-ribofuranoside (AICAR), an adenosine monophosphate activated protein kinase (AMPK) activator, also increased saliva secretion. fAd, gAd, and AICAR all increased the average width of apical tight junctions in perfused submandibular glands, and decreased transepithelial electrical resistance (TER) in SMG-C6 cells, suggesting that adiponectin promoted secretion by modulating paracellular permeability. fAd and gAd increased p-AMPK levels, while AraA, an AMPK antagonist, abolished fAd- and gAd-induced changes in secretion, tight junction ultrastructure, and TER. Moreover, both AdipoR1 and AdipoR2 were required for fAd- or gAd-induced p-AMPK and TER responses, suggesting from their inhibition following AdipoR1 or AdipoR2 knockdown, and co-knockdown of AdipoRs by RNA interference. Our results suggest that adiponectin functions as a promoter of salivary secretion in rat submandibular glands via activation of AdipoRs, AMPK, and paracellular permeability.
- Published
- 2013
15. Tagging Complex NEs with MaxEnt Models: Layered Structures Versus Extended Tagset
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Hong-Kui Yu, Deyi Xiong, and Qun Liu
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Set (abstract data type) ,Context window ,Computer science ,business.industry ,Principle of maximum entropy ,Data mining ,Artificial intelligence ,Machine learning ,computer.software_genre ,business ,computer ,Human knowledge - Abstract
The paper discusses two policies for recognizing NEs with complex structures by maximum entropy models. One policy is to develop cascaded MaxEnt models at different levels. The other is to design more detailed tags with human knowledge in order to represent complex structures. The experiments on Chinese organization names recognition indicate that layered structures result in more accurate models while extended tags can not lead to positive results as expected. We empirically prove that the {start, continue, end, unique, other} tag set is the best tag set for NE recognition with MaxEnt models.
- Published
- 2005
16. Chinese lexical analysis using hierarchical hidden Markov model
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Huaping Zhang, Qun Liu, Hao Zhang, Xueqi Cheng, and Hong-Kui Yu
- Subjects
Computer science ,business.industry ,media_common.quotation_subject ,Speech recognition ,Text segmentation ,Lexical analysis ,Hierarchical hidden Markov model ,Ambiguity ,computer.software_genre ,Lexicon ,Segmentation ,Artificial intelligence ,Chinese word ,business ,Hidden Markov model ,computer ,Natural language processing ,media_common - Abstract
This paper presents a unified approach for Chinese lexical analysis using hierarchical hidden Markov model (HHMM), which aims to incorporate Chinese word segmentation, Part-Of-Speech tagging, disambiguation and unknown words recognition into a whole theoretical frame. A class-based HMM is applied in word segmentation, and in this level unknown words are treated in the same way as common words listed in the lexicon. Unknown words are recognized with reliability in role-based HMM. As for disambiguation, the authors bring forth an n-shortest-path strategy that, in the early stage, reserves top N segmentation results as candidates and covers more ambiguity. Various experiments show that each level in HHMM contributes to lexical analysis. An HHMM-based system ICTCLAS was accomplished. The recent official evaluation indicates that ICTCLAS is one of the best Chinese lexical analyzers. In a word, HHMM is effective to Chinese lexical analysis.
- Published
- 2003
17. HHMM-based Chinese lexical analyzer ICTCLAS
- Author
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Huaping Zhang, Qun Liu, Hong-Kui Yu, and Deyi Xiong
- Subjects
Computer science ,Speech recognition ,Frame (networking) ,Segmentation ,Big5 ,Chinese word - Abstract
This document presents the results from Inst. of Computing Tech., CAS in the ACL SIGHAN-sponsored First International Chinese Word Segmentation Bake-off. The authors introduce the unified HHMM-based frame of our Chinese lexical analyzer ICTCLAS and explain the operation of the six tracks. Then provide the evaluation results and give more analysis. Evaluation on ICTCLAS shows that its performance is competitive. Compared with other system, ICTCLAS has ranked top both in CTB and PK closed track. In PK open track, it ranks second position. ICTCLAS BIG5 version was transformed from GB version only in two days; however, it achieved well in two BIG5 closed tracks. Through the first bakeoff, we could learn more about the development in Chinese word segmentation and become more confident on our HHMM-based approach. At the same time, we really find our problems during the evaluation. The bakeoff is interesting and helpful.
- Published
- 2003
18. Right and left ventricular mechanics and interaction late after balloon valvoplasty for pulmonary stenosis.
- Author
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Shu-juan Li, Hong-kui Yu, Wong, Sophia J., and Yiu-fai Cheung
- Subjects
HEART physiology ,LEFT heart ventricle ,RIGHT heart ventricle ,HEART beat ,CARDIAC output ,CARDIOLOGY ,DIAGNOSTIC imaging ,ECHOCARDIOGRAPHY ,HEART valve diseases ,EVALUATION of medical care ,PULMONARY stenosis ,TRANSLUMINAL angioplasty ,DATA analysis ,DATA analysis software ,DESCRIPTIVE statistics ,DIAGNOSIS ,PHYSIOLOGY - Abstract
The article presents a research study which investigates Right and left ventricularmechanics and interaction in patients who have undergone balloon pulmonary valvoplasty (PBPV) for valvar pulmonary stenosis (PS). It states that speckle tracking echocardiography method was used to determine ventricular myocardial deformation in patients and it was concluded that adverse right (RV) and left ventricular (LV) interaction occurs after balloon valvoplasty for isolated valvar PS.
- Published
- 2014
- Full Text
- View/download PDF
19. NEW 3D SPECKLE TRACKING ECHOCARDIOGRAPHY IDENTIFIES GLOBAL IMPAIRMENT OF LEFT VENTRICULAR MECHANICS WITH A HIGH SENSITIVITY IN CHILDHOOD CANCER SURVIVORS
- Author
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Sophia J. Wong, Wei Yu, Godfrey Cf Chan, Yiu-fai Cheung, Hong-kui Yu, and Ka-leung Cheuk
- Subjects
medicine.medical_specialty ,business.industry ,Internal medicine ,Childhood cancer ,medicine ,Cardiology ,Speckle tracking echocardiography ,Sensitivity (control systems) ,Radiology ,Cardiology and Cardiovascular Medicine ,business ,humanities ,Ventricular mechanics - Abstract
Cardiovascular disorders are important causes of late morbidity in childhood cancer survivors. This study assessed the usefulness of three-dimensional speckle tracking echocardiography (3D-STE) in the evaluation of global left ventricular (LV) myocardial performance in adolescent and adult survivors
- Full Text
- View/download PDF
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