Vascular Calcification, Inflammation and Coronary Flow Velocity in Hemodialysis Patients
The aim of this cross-sectional study is to determine the correlation of coronary artery calcification as measured by electron-beam computerized tomography and coronary flow reserve measured by trans-thoracic Doppler echocardiography in hemodialysis patients. The investigators also assessed the carotid artery parameters by measuring intima media thickness that can accurately describe the process of arterial wall changes due to atherosclerosis. Possible association of coronary flow reserve with inflammation and arterial calcification in hemodialysis patients was also evaluated.
|Study Design:||Time Perspective: Cross-Sectional|
|Official Title:||The Association Among Vascular Calcification, Inflammation and Coronary Flow Velocity in Hemodialysis Patients|
- Comparison of coronary artery calcium scores measured by electron-beam computerized tomography and coronary flow reserve. [ Time Frame: 3 months ] [ Designated as safety issue: Yes ]
- Relationship between coronary artery calcium scores, coronary flow reserve and inflammatory parameters (IL-6,TNF-alpha, hs-CRP). [ Time Frame: 3 months ] [ Designated as safety issue: Yes ]
|Study Start Date:||April 2008|
|Study Completion Date:||December 2008|
|Primary Completion Date:||July 2008 (Final data collection date for primary outcome measure)|
End stage renal disease patients aged lower than 70 years, treated for more than 6 months with hemodialysis
Normotensive healthy controls
Cardiovascular mortality is a major cause of death in end-stage renal disease (ESRD). Therefore, the identification of coronary artery disease (CAD) in ESRD is an important task for nephrologists. Coronary angiography is the gold standard for detecting extent and severity of coronary atherosclerosis. It was necessary to determine whether coronary angiography, which is an invasive and contrast using procedure, should be performed in all high-risk individuals or whether noninvasive testing could reliably identify patients with critical coronary lesions. The coronary artery calcification (CAC) in uremic patients undergoing hemodialysis reflects the severity of atherosclerotic vascular disease and predicts the cardiovascular events. Recent studies of chronic kidney disease (CKD) patients have shown significant incidence and rapid progression rates of CAC. Coronary electron-beam computerized tomography (EBCT) could be used as screening test to identify cardiovascular disease (CVD) in CKD patients. In coronary artery disease, left ventricular diastolic dysfunction was found to be correlated with reduced coronary flow reserve (CFR) in patients with hypertension and left ventricular hypertrophy. This shows that in patients with vascular calcification, CFR measurement by trans-thoracic Doppler echocardiography (TTDE) as a non-invasive and an easy test has a usage advantage during risk stratification. CFR represents the capacity of the coronary circulation to dilate following an increase in myocardial metabolic demands. By using this method, impairment of CFR can be assessed before development of angiographically detectable stenosis in epicardial coronary arteries and we are able to investigate early coronary microvasculature pathology. The aim of this cross-sectional study, is to determine the correlation of CAC as measured by EBCT and CFR measured by TTDE. We also assessed the carotid artery parameters by measuring intima media thickness that can accurately describe the process of arterial wall changes due to atherosclerosis. Possible association of CFR with inflammation and arterial calcification was also evaluated.
|Division of Nephrology, Department of Internal Medicine, Istanbul Faculty of Medicine, Istanbul University|
|Istanbul, Turkey, 34390|
|Study Director:||Alaattin Yildiz, MD||Division of Nephrology, Istanbul Faculty of Medicine, Istanbul University|
|Principal Investigator:||Yasar Caliskan, MD||Division of Nephrology, Istanbul Faculty of Medicine, Istanbul University|