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Dialysis-associated ischemic heart disease: insights from coronary angiography
Insights
Dialysis patients often have symptomatic ischemic heart disease (IHD) without significant coronary artery narrowing. Factors like older age and male sex predict coronary artery occlusion in these patients.
Area of Science:
- Cardiology
- Nephrology
- Vascular Biology
Background:
- Dialysis patients experience high rates of cardiovascular disease.
- Ischemic heart disease (IHD) is a major cause of mortality in patients undergoing dialysis.
- The relationship between symptomatic IHD and coronary artery atherosclerosis in this population requires further elucidation.
Purpose of the Study:
- To determine the frequency of symptomatic IHD coinciding with significant coronary artery narrowing in dialysis patients.
- To identify factors associated with the coronary atherosclerotic process in this cohort.
- To investigate potential mechanisms linking dialysis to myocardial oxygen imbalance.
Main Methods:
- Retrospective review of medical records for 44 dialysis patients who underwent coronary angiography.
- Analysis of patient demographics, clinical presentation (angina pectoris, myocardial infarction), and angiographic findings.
- Statistical analysis, including discriminant function analysis, to identify predictive variables for coronary artery occlusion.
Main Results:
- 53% of dialysis patients catheterized for IHD symptoms had significant coronary artery narrowing.
- Patients with significant coronary occlusion were older, predominantly white males, and had shorter dialysis duration.
- Predictive factors for coronary artery occlusion included older age, white race, male sex, prior symptomatic IHD, elevated total serum cholesterol, abnormal left ventricular wall motion, and reduced alkaline phosphatase.
- Symptomatic IHD occurred more frequently than significant coronary artery narrowing.
Conclusions:
- Symptomatic IHD in dialysis patients frequently occurs without significant coronary artery narrowing, suggesting non-atherosclerotic contributors.
- Older age, white race, male sex, and specific clinical/biochemical markers are associated with coronary atherosclerosis in this population.
- Dialysis-associated alterations in oxygen delivery and myocardial oxygen consumption may explain the discrepancy between symptomatic IHD and coronary artery findings.
Abstract:
We reviewed the records of 44 dialysis patients who had undergone one or more coronary angiograms to determine the frequency with which symptomatic ischemic heart disease (IHD) and significant coronary artery narrowing coincided and to determine those factors which were associated with the coronary atherosclerotic process. Thirty-four patients were catheterized for angina pectoris or myocardial infarction. Of this group, 53% were found to have significant narrowing of coronary arteries. This group was older than the group with trivial or no coronary artery occlusion and their duration of dialysis was shorter. All the patients with significant coronary occlusion were white and the majority were adult males. Discriminant function analysis revealed that the presence of significant coronary artery occlusion could be predicted with high sensitivity and specificity by the following variables: older age, white race, male sex, the presence of symptomatic IHD prior to the onset of dialysis, increased total serum cholesterol, abnormal left ventricular wall motion, and reduced alkaline phosphatase. We also found that the occurrence of symptomatic IHD far exceeded the presence of significant atherosclerotic coronary artery narrowing. We suggest that this may result from several dialysis-associated alterations in oxygen delivery and myocardial oxygen consumption.