Active clinical trials for "Constriction, Pathologic"

The current trial is designed to assess the safety and efficacy of sustained oral administration of inorganic nitrate in patients with severe aortic stenosis and to assess the mechanisms by which inorganic nitrate enhances oxygen uptake and exercise capacity in this population.

First-In-Man Study on the ACURATE TF™ Transfemoral Aortic Bioprosthesis Implantation in Patients with Severe Aortic Stenosis to collect human feasibility data pertaining to the safety and performance of the device.

Only a small proportion of patients with biliary obstruction caused by hepatopancreatobiliary malignancies are suitable for surgical resection. Therefore, most patients with malignant biliary obstruction will need palliation of their obstructive jaundice to relieve the symptoms and prevent life threatening complications such as biliary sepsis. The endoscopic or percutaneous/transhepatic routes, such as endoscopic retrograde cholangiopancreatography (ERCP) and percutaneous transhepatic cholangiography (PTC), and stents are accepted approaches for the relief of jaundice in malignant biliary obstruction. Improvement in the bilirubin level is also essential before palliative chemotherapy is considered in these patients. However, tumor ingrowth still remains a major cause of obstruction. In this trial, the investigators will use HabibTM EndoHPB (EMcision Ltd., UK) catheter which was used for the endobiliary radiofrequency ablation (RFA) treatment as a form of neoadjuvant therapy in hepatopancreatobiliary adenocarcinoma.

From adulthood onwards, the aging process manifests itself in the spine through loss of disc height and kyphotic deformity. As the general population ages, the prevalence of lumbar degenerative diseases and sagittal imbalance increases. Sagittal balance is a physiological alignment resulting from the effective muscular and ligamentary forces that place patients' heads harmoniously in line with their pelvis. Roussouly first classified this alignment by differentiating four types of balance in an asymptomatic population. He established a link between the varieties of sagittal balance of the spine, the sacral slope and the position of the pelvis in space. He went on to explain sagittal imbalance in the aging population suffering from degenerative diseases. One of the most common lumbar degenerative diseases is lumbar spinal canal stenosis. Stenosis of the lumbar spinal canal is frequently associated with sagittal imbalance of the spine. Lumbar canal stenosis causes lumbar pain, leg pain, neurogenic intermittent claudication and bladder and rectal disorders. The severity of clinical symptoms increases linearly with progressive sagittal imbalance [8]. We represent the sagittal imbalance of the spine by a positive sagittal vertical axis (SVA) presented by patients to reduce the pressure exerted by the yellow ligament, which is hypertrophied in degenerative disease . Many have shown that this forward-flexing posture can be improved by simple decompression, and that this deformity corresponds to an analgesic position and not to a structural deformity. Little is known about the factors that influence alignment after lumbar canal decompression and short segment fusion. This study therefore aims to elucidate some of the clinical and radiological factors likely to affect postoperative sagittal balance in patients undergoing simple minimally invasive decompression surgery and short segment fusion (1 or 2 levels).

The goal of this study is to investigate the genetic and gender specific differences, in patients with low flow low gradient aortic stenosis and high flow high gradient aortic stenosis. Patients referred for surgical aorticvalve replacement will be offered to participarte in the study. The main questions the study aims to answer are: Low-gradient aortic stenosis is associated with differences in valvular concentration of the genes that code for mast-cell chymase, Angiotensin-II, ACE, ACE2 and Angiotensin receptor 1 and 2. Low-gradient aortic stenosis is associated with differences in the genetic code of renin-angiotensin-aldosterone system. Gender differences in LV remodelling associates with different levels of sexual hormones. Patients participating in the study will be asked to undergo: Cardiac ultrasound, MR- and CT-scan prior to surgery Blooddraw prior to surgery. Heartmuscle biopsy during surgery Cardiac MR-scan 1 year after surgery.

The objective of this study is to assess the safety and effectiveness of the COVERA™ Vascular Covered Stent for the treatment of stenotic lesions in the upper extremity venous outflow of the Arteriovenous (AV) access circuit.

To validate the long-term effects of implantation of the self-expanding Smart nitinol stent system for the treatment of severe atherosclerotic carotid stenosis in a 2-year follow-up study of a large patient cohort

Nocturnal calf cramps is a common complaint in patients with lumbar spinal stenosis. The purpose of this study is to evaluate the effect of botulinum toxin A injection into the gastrocnemius muscle in lumbar spinal stenosis patients receiving conservative therapy. We will compare pain score, insomnia severity, functional ability, patient satisfaction, and neurophysiological variables change using electrical stimulator between control (conservative management for spinal stenosis) and botox group (conservative management for spinal stenosis plus botox injection into the gastrocnemius muscle).

To assess the safety and efficacy of the BARD LTX DCB for treatment of stenosis or occlusion of the superficial femoral and popliteal arteries.

The purpose of the present study is to evaluate the effectiveness of a prehabilitation program on the recovery of patients undergoing a minimally invasive surgery for degenerative lumbar spinal stenosis. To do so, 40 participants will be recruited and randomized into two groups; intervention or control group. Participants in the intervention group will take part in a physical training program, three times a week for six weeks before undergoing surgery. The exercise program will be supervised and will aim at improving core muscles strength and endurance as well as spine stability. It is hypothesized that the prehabilitation program will significantly improve disability and pain intensity reported by patients after surgery. Ultimately, this study aims to improve health care of patients awaiting lumbar surgery but its results may also impact the management of patients awaiting spine surgery for various conditions.