Active clinical trials for "Heart and Blood Diseases"

The purpose of this study is to collect and compare EndoSure and EndoSure s2 Wireless AAA Pressure Sensor measurements with measurements from CT scan imaging, ultrasound, and other tests used to measure your AAA sac size and endoleaks following AAA repair, and during follow-up visits with your physician. An antenna is held over the patient's abdomen to measure pressure inside the aneurysm sac. The reading does not cause any discomfort, and dye or radiation is not needed to take the pressure measurement. To qualify, the patient must have a previously implanted EndoSure Sensor.

Arterial pulse wave velocity (PWV) is strongly correlated with atherosclerosis, and the PWV of carotid or femoral artery could predict the severity of arterial atherosclerosis. Because the measurement of PWV is noninvasive, it would serve as a good clinical and screen marker to evaluate the extent of atherosclerosis. The study uses self-made PWV measurement device to investigate the correlation of the PWV in the high cardiovascular risk population, and compare it with normal population.

The aim of this study is the identification of familial congenital arrhythmogenic disorders and their clinical follow-up.

The purpose of this study is to investigate if breathing disorders are related to atrial fibrillation and if it is possible to predict recurrence of atrial fibrillation after DC-conversion by changes in heart rate variability and 24 hour ECG.

The aim of this study is to show the frequency of endothelial dysfunction in patients suffering from ectatic coronary arteries as compared to those who have normal coronary arteries. Should this frequency be significant we would recommend initiating conventional treatment in those patients with ectatic coronary arteries as is the practice in patients with endothelial dysfunction without ectatic arteries

The purpose of this study is to determine whether there is a relationship between serial B-natriuretic peptide (BNP) and implantable device measured intrathoracic impedance in symptomatic and asymptomatic heart failure patients over a 1-year period. Furthermore, this study will establish whether implantable device measured intrathoracic impedance trends with the distance walked on a six-minute hall walk (6MHW), an exercise-based acute measure that has also been associated with heart failure clinical status.

The purposes of this study are to investigate the functional connectivity of motor network in patients of stroke and investigate the mechanism of brain plasticity for recovery after stroke.

Patients with hemolytic disorders (e.g. sickle cell anemia or thalassemia) are known to develop pulmonary hypertension. Hemolysis is where red blood cells are destroyed and their contents released into the circulation. It is thought that these red-cell contents cause constriction and thrombosis of the blood vessels in the lungs. Conversely, it is possible that patients with pulmonary hypertension have hemolysis. In this study we will be drawing blood from a range of patients and normal controls for a panel of blood tests related to hemolysis.

The exact etiology of ischemic stroke remains unclear, because multiple genetic predispositions and environmental risk factors may be involved, and their interactions dictate the complexity. Family-based studies provide unique features in design because of their robustness to population admixture and stratification. The Fangshan / Family-based Ischemic Stroke Study In China (FISSIC) program aims to conduct a genetic pedigree study of ischemic stroke in rural communities of China.

The goals of this trial are: To compare the sensitivity and specificity of various tools including Doppler and magnetic resonance imaging (MRI) for diagnosing vertebral artery stenosis and carotid artery stenosis. The positron emission tomography (PET)/MRI fusion imaging will be a promising tool to provide both anatomical and functional imaging for vulnerable plaques. To identify patients at high risk of plaque rupture by image studies, biomedical profile, and gene expression of circulating monocytes.