Active clinical trials for "Constriction, Pathologic"

Purpose of the study To evaluate the lower puntum dimensions in cases of acquired punctal stenosis(APS), using anterior segment optical coherence tomography (AS-OCT).

This study aims to evaluate whether baseline 18F-sodium fluoride uptake activity at aortic valve could predict aortic stenosis progression in moderate aortic stenosis. Patients with moderate aortic stenosis are enrolled and underwent baseline evaluation including 18F-sodium fluoride PET/CT. After 1 year, all the participants underwent follow-up echocardiography. The study design is an observational trial. Primary endpoint was a change in mean pressure gradient along the aortic valve as assessed by echocardiography at 1 year. Secondary endpoints include changes in aortic valve area, and symptom occurrence.

Atherosclerosis is the major contributor for the morbidity and mortality for the variety of cardiovascular diseases. Aortic calcification on x-ray is a marker for arterial atherosclerosis and an independent prognostic factor for the morbidity and mortality from a cardiovascular event. Carotid artery stenoses is the current accepted indication for interventional treatment of carotid artery, for the prevention of embolic event, while other arterial atherosclerosis indication, is for hemodynamic disturbance and ischemic outcome. This research will try to find whether incidental aortic calcification can predict carotid artery stenosis. Two groups will be chosen: group A - patients who had CT scan in the hospital (for different indications); Group B - patients (not from the first group) who have a significant carotid artery stenosis who are indicated for interventional treatment. The data to analyze: Group A - Patients with aortic calcification, carotid artery stenosis, and patients with both Group B - Patients who have aortic calcification Comparison of the populations within the group and among the two will show if a significant correlation between aortic calcification and carotid artery stenosis exist.

Pathophysiology of Aortic Valve Stenosis remains poorly known. The aim of the present study is to identify genetic factors involved in this disease using a case control trial design.

The population of the US is aging. They remain more active and place greater demands on their musculoskeletal system. A key problem is that pain and disability of age related spinal disorders will increase. Problems such as Degenerative Lumbar Spondylolisthesis, Degenerative Disk Disease, Spinal Stenosis and Degenerative Scoliosis are age related problems that are treated with spinal fusion when non-operative treatment fails. Traditional open surgery poses significant risk for patients in this age group. The use of minimally invasive spinal surgery techniques provides an opportunity to treat these patients with less morbidity than traditional open surgery.

The purpose of this study is to determine the accuracy of a new non-invasive device, the Carotid Stenotic Scan (CSS), to check for stenosis of the internal carotid artery (ICA) as compared to a carotid duplex ultrasound study.

Register of treatment of unprotected left main coronary artery stenosis in Andalucia (RETRATO).

Aims: evaluate the hydric status through bioimpedance spectroscopy in consecutive acute myocardial infarction patients referred for primary PCI; assessment of renal artery stenosis incidence through renal angiography in consecutive STEMI patients; fully characterize the complex hydration, metabolic and endothelial profile of these patients in the attempt to define the role played by dehydration in the complex dynamics of acute myocardial infarction.

In patients with asymptomatic aortic stenosis (AS), the prognostic value of reduced left ventricular (LV) ejection fraction is well known. Consequently, there is class I indication for surgery in these patients when LV ejection fraction <50%. However, there is growing evidences suggesting that subclinical LV dysfunction, and more particularly longitudinal myocardial dysfunction, may be a powerful early predictor of outcome, even when LV ejection is still preserved. In asymptomatic AS patients with LV ejection fraction >50%, a reduced LV global longitudinal strain, as assessed using speckle tracking imaging with transthoracic echocardiography, may be an accurate marker to identify early subclinical LV dysfunction and thus, to improve the risk stratification, the management and the timing of surgery. Several mono-centric observational small studies recently reported results emphasizing the role of LV global longitudinal strain in AS patients. Therefore, a meta-analysis may be conducted and may provide meaningful data. The investigators hypothesized that LV global longitudinal strain is a determinant of outcome in asymptomatic patients with AS and preserved LV ejection fraction.

The primary purpose of this study is electronic data collection of arterial pressure waveform signals in patients with Aortic Stenosis. The collected digital pressure waveform data will be used to assess the feasibility of using the arterial pressure signal as a decision support tool for early detection of aortic stenosis conditions. Furthermore we evaluate hemodynamic parameters before and after valve repair and its correlation with outcome.