Which statement best defines heart failure?

• A. Heart's ability to pump too much blood leading to edema.
• B. Excessive urine production.
• C. Inability of the heart to pump enough blood to meet the body's demands.
• D. Increased contractility of the heart causing hypertension.

Answer: (C)

Heart failure is defined by the heart’s inability to pump enough blood to meet the body’s metabolic needs. When cardiac output falls short, tissues and organs don’t receive adequate oxygen and nutrients, leading to symptoms like fatigue and dyspnea, and the body activates compensatory mechanisms that can cause fluid buildup over time. Among the options, the statement that describes the heart failing to deliver enough blood to meet demands best captures this fundamental problem of insufficient perfusion.

The others describe processes that aren’t the defining issue. Pumping too much blood would imply a high-output state, which isn’t how heart failure is characterized. Excessive urine production isn’t the defining problem of heart failure, though diuresis can occur in response to congestion. Increased contractility causing hypertension would imply a different hemodynamic situation and isn’t how heart failure is defined.