View clinical trials related to Constriction, Pathologic.
Filter by:To observe the clinical outcomes of the different valve sizing strategies treating type-0 Bicuspid Aortic Stenosis (BAS) with self-expandable transcatheter aortic valve implantation (TAVI) valve, compared with those of a standard sizing strategy of normal Tricuspid Aortic Stenosis(TAS).
To confirm the safety and efficacy of the Lotus™ Valve System in the Chinese population for Transcatheter Aortic Valve Implantation (TAVI) in symptomatic patients with severe aortic stenosis.
This study will be evaluate the autonomic, endothelial and hemodynamic functions, inspiratory muscle strength, peripheral tissue oxygenation, peripheral and respiratory muscle architecture, and inflammatory profile of severe AS patients submitted undergoing to valve replacement (sAVR) or transcatheter aortic valve implantation (TAVI), and their influence on the pathophysiological mechanisms involved in cardiovascular rehabilitation.
Biliary strictures present a diagnostic and therapeutic challenge to clinicians due to unsatisfied accuracy of sampling modality. The major problem is very difficult to discern malignant from non-malignant strictures, such as patients with primary sclerosing cholangitis (PSC). With the poor prognosis and high mortality rate of advanced stage of hepatopancreaticobiliary malignancies, early and accurate diagnosis impacts patients' outcome and possible surgical candidacy. Therefore, a pre-operative determination of malignancy to help plan appropriate treatment is highly desirable. Before 2000s, several diagnostic modalities, including laboratory tests, ultrasonography (US), computed tomography (CT) scan, cholangiography by percutaneous transhepatic cholangiography endoscopic (PTC) and endoscopic retrograde cholangiopancreatography (ERCP), and brushing cytology disclosed 13% to 24% false positive rate for suspicious malignant hilar strictures. Compared to recent studies, ERCP brushings still suffer from low sensitivity (41.6% ± 3.2% (99% CI)) and negative predictive value (58.0% ± 3.2% (99% CI)). In order to increase diagnostic accuracy, at least two sampling methods, including brushing cytology, biopsy, and fine-needle aspiration is therefore recommended. One article showed multimodal tissue-sampling (Brushing + Biopsy + Fine-needle aspiration) increased the sensitivity for diagnosis of malignant biliary stricture to 62%. However, no any literature demonstrate the best sequence of combined sampling modalities to yield the highest diagnostic accuracy. Besides, the role of stricture dilation before or after different tissue sampling modality is still uncertain. In this study, the investigators want to compare stricture dilation before or after multimodal tissue-sampling, including brush cytology, intraductal suction and forceps biopsy for the diagnosis of malignant biliary stricture and also assess which kind of the sequence of combined tissue-sampling modalities could offer the highest diagnostic accuracy.
The purpose of this study is to compare the effect of DSA guided percutaneous balloon dilatation, ultrasound guided percutaneous balloon dilatation and surgical repair in the treatment of Stenosis of Arteria-Venous Fistula in Maintenance Hemodialysis Patients.
The purpose of this study is to evaluate the efficacy and safety of staged carotid angioplasty v.s. routine single-stage carotid artery stenting in Chinese patients with carotid artery stenosis at high hyperperfusion risk in peri-procedural period.
The asses and evaluate whether trans apical access for TAVR is associated with apical dysfunction.
The study will determine the benefit of Colchicine versus placebo for cardiac surgery patients on the post-operative development of atrial fibrillation and post-pericardiotomy syndrome. Primary Objective. Colchicine will reduce the composite endpoint of incidence of post-operative atrial fibrillation and post-pericardiotomy syndrome at 3 months following cardiac surgery. Secondary Objectives. 1. Colchicine will reduce the incidence of constrictive physiology on echocardiography at 3 months following cardiac surgery. 2. Reduction in the burden of symptomatic and asymptomatic atrial fibrillation in the 3 months following cardiac surgery with the use of colchicine.
Stenting for systematic Intracranial artery stenosis is challenged recently, especially for safety. This registry is aimed to explore the safety profile during peri-operation period in Stenting procedures for systematic Intracranial artery stenosis in Chinese population in real world.
The investigators aim to identify all clinical, biological, echo and imagistic parameters that predispose to increased progression rates in a prospective observational trial which will include ONLY patients with moderate AS, with the complete cardiological investigational tools provided in 2012. Once those parameters are found, medical and interventional treatment could be implemented to decrease the mortality rates.