Cardiovascular changes in chronic renal failure--pathogenesis and therapy

Area of Science:

• Cardiovascular Medicine
• Nephrology
• Pathology

Background:

• Cardiac death due to ischemia is the primary cause of mortality in chronic renal failure (CRF) patients.
• This ischemia is not always linked to coronary artery disease.
• Uremia significantly impacts cardiac and vascular structures and function.

Purpose of the Study:

• To review current findings on structural and functional changes in the heart and vessels of uremic patients.
• To elucidate the mechanisms behind reduced myocardial ischemia tolerance in CRF.
• To explain the high cardiovascular mortality observed in CRF.

Main Methods:

• Review of existing literature on uremia-induced cardiovascular changes.
• Analysis of structural alterations in the myocardium and vasculature.
• Examination of metabolic changes affecting myocardial function.

Main Results:

• Cardiovascular structural changes include left ventricular hypertrophy, interstitial fibrosis, and rarefaction of intramyocardial capillaries.
• Myocardial microcirculation is affected by capillary rarefaction and thickening of intramyocardial arteries.
• Metabolic changes, such as decreased high-energy phosphates, heighten myocardial ischemia sensitivity.
• Extracardial vascular changes involve wall thickening, reduced elastic fibers, increased extracellular matrix, and media calcification, leading to increased vascular stiffness and reduced aortic compliance.

Conclusions:

• Structural and functional cardiovascular changes in uremia significantly impair myocardial ischemia tolerance.
• These changes contribute substantially to the high cardiovascular mortality in chronic renal failure.
• Understanding these mechanisms is crucial for managing cardiovascular risk in CRF patients.