Active clinical trials for "Coronary Artery Disease"

Purpose: The investigators plan to test a newly FDA approved pharmacologic stress agent, Regadenoson, in conjunction with atropine in the use of stress echocardiography for the diagnosis of coronary artery disease. The selective nature of Regadenoson allows for its use in patients with contraindications to the currently used drug, Adenosine, which is non-selective. Furthermore, the proposed protocol can be completed faster and without radiation exposure than the current protocol with adenosine. Design: This is a prospective study evaluating people with no prior diagnosis of coronary disease with a prior stress test and are scheduled for cardiac catheterization. Patients who meet inclusion criteria will undergo regadenoson-atropine echocardiography protocol prior to their catheterization. The study will be interpreted by two independent readers blinded to the catheterization results. The sensitivity, specificity, positive and negative predictive values of the regadenoson-atropine study will be then be calculated using the coronary angiogram as a gold standard.

This study is a prospective, single-center evaluation of the impact of the variability in platelet response after loading with clopidogrel on the peri-interventional risk of patients undergoing PCI.

The purpose of this research is to determine if two proteins in the blood are increased during acute myocardial infarction and whether their levels are higher in those who develop heart failure than those who do not. These two proteins are produced and potentially released when the heart muscle is damaged. They may then be released into the blood and be detected by standard method in the research laboratory. At this time, detection of an increase in these proteins in the blood is not known to be associated with any disease or myocardial infarction.

This study will assess the benefit in using a frailty score to quantify accurate risk pre-operatively in patients undergoing major cardiac surgery in order to predict morbidity and disability-free survival post-operatively.

This study will assess the differences between Fractional Flow Reserve (FFR) measurements made by the Navvus catheter and a commercially available pressure guidewire in up to 240 subjects where FFR is clinically indicated. All subjects will receive diagnostic treatment according to clinical indications and center standard practice.

Preoperative detection of combined coronary artery disease by invasive coronary angiography (ICA) is recommended in American Heart Association (AHA)/American College of Cardiology (ACC) guidelines for most patients (>40 yrs male or postmenopausal female) scheduled for heart valve surgery, but the low incident rate of coronary artery disease implied guidelines for the vast majority who ultimately will not undergo revascularization. Computed tomography angiography (CTA) has emerged as an alternative diagnosis procedure, which has the following advantages: non-invasive, low cost, provide information of lung and mediastinum. Our study is to evaluate the feasibility of computed tomography, instead of conventional invasive coronary angiography in evaluating coronary artery lesion prior to the heart valvular operation.

The purpose of the study is to identify a sub-group of diabetic patients at higher risk of progression of coronary disease and also more likely to suffer from heart attack/angina and heart failure. The total number of patients to be recruited in this study will be 250 with type-2 diabetes but no known heart disease. These patients will have an objective measure of the function of the lining of the arteries, CT scan of the arteries of the heart and an ultrasound scan of the heart and arteries of the neck done at baseline along with blood tests for identification new markers of malfunction of the lining and inflammation of the arteries. Patients will be followed up at 18 months. During the follow-up visit, in addition to the blood tests, the CT scan of the heart arteries and ultrasound of the heart and arteries of the neck will be repeated to assess progression of the non-calcified, calcified and mixed plaques in the coronary arteries.

All consecutive patients undergone PTCA in the period between July 2013 and December 2013 are eligible to be enrolled. Study population are divided in : Group 1: smokers on dual antiplatelet therapy with ASA (100 mg once a day) and Prasugrel (10 mg die); Group 2: smokers on dual antiplatelet therapy with ASA(100 mg once a day) and Ticagrelor (90 mg twice a day); Control group: smokers on dual antiplatelet therapy with ASA(100 mg once a day) and Clopidogrel (75 mg once a day). Platelet function is evaluated using a validated method: the VerifyNow System (Accumetrics Inc., San Diego, CA), which is a point-of-care turbidimetry-based optical detection system that measures platelet-induced aggregation. These value are measured Platelet function, measured with the VerifyNow P2Y12. All patients on chronic dual antiplatelet therapy (>1 month) quit smoking for a 2 weeks period. Therefore PRU values are obtained at baseline (at the enrollment time) and after 2 weeks after smoking cessation. Platelet reactivity are expressed in P2Y12 reaction units (PRU). PRU values >240 are suggestive of high platelet reactivity. Primary outcomes: P2Y12 reaction units (PRU) at baseline and two weeks after quitting smoking.

There is currently no published algorithm for secondary prevention prognosis of CHD that is representative of the England GP-registered population and that includes both symptomatic and asymptomatic patients (as identified through primary care). In this paper the investigators will exploit routinely collected information in clinical practice to model CHD prognosis based on a large contemporary open cohort of stable CAD patients. Although the investigators model is based on data from GP practices in England only, the investigators believe that this population is sufficiently heterogeneous in terms of ethnic mix, socioeconomic background, predisposing characteristics and lifestyles to generate a prognostic model with good generalizing power to the wider population. Among the research questions the investigators will try to answer is whether established risk factors for primary care prevention (smoking, hypertension, dyslipidaemia, diabetes) are also reliable for risk-stratification of patients who have already developed CAD. Similarly, the investigators will examine whether strong predictors of adverse outcomes in ACS patients in the short term, such as admission SBP and heart rate, are also associated with their long term prognosis.

This study was advocated by Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences in October 2011. It was funded by China major scientific and technological specialized project for 'significant new formulation of new drugs'. Shenfu is kind of Chinese Medicine injection used for treating shock and coronary heart disease in many Chinese hospitals. The purpose of this study is to determine adverse drug events or adverse drug reaction in large sample size 20,000 patients.