Pathophysiology of Congestive Heart Failure and Angina

The pathophysiology of congestive heart failure is rooted in the heart's inability to pump sufficient blood, leading to a cascade of neurohormonal and hemodynamic changes. These changes include the activation of the renin-angiotensin-aldosterone system (RAAS) and sympathetic nervous system, contributing to fluid retention, vasoconstriction, and further deterioration of cardiac function. Angina, on the other hand, typically results from a mismatch between myocardial oxygen demand and supply, often due to atherosclerotic plaque buildup in the coronary arteries.

In CHF, the failing heart struggles to meet the body's metabolic needs, leading to compensatory mechanisms that, while initially beneficial, eventually worsen heart function. The ischemic myocardium in angina is often a precursor to heart failure, especially when repetitive episodes of ischemia lead to myocardial stunning or hibernation. Understanding these underlying mechanisms is key to developing targeted therapies that can interrupt the progression from angina to heart failure.

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