Which statement best describes the neurohormonal response in heart failure?

Which statement best describes the neurohormonal response in heart failure?

• A. Decreased norepinephrine
• B. Decreased aldosterone
• C. Hypertension due to vasodilation
• D. Increased norepinephrine

Answer: (D)

In heart failure, reduced cardiac output triggers compensatory activation of the sympathetic nervous system. This leads to increased norepinephrine release, which aims to maintain blood pressure and perfusion by increasing heart rate, contractility, and peripheral vasoconstriction. While this helps in the short term, chronic elevation of norepinephrine damages the heart, promotes remodeling, and increases the risk of arrhythmias. So, the neurohormonal response is best described by increased norepinephrine. Note: RAAS activation also occurs (raising aldosterone and angiotensin II), which promotes sodium and water retention and further vascular changes, but the statement that directly reflects the neurohormonal drive in this context is the rise in norepinephrine.

In heart failure, reduced cardiac output triggers compensatory activation of the sympathetic nervous system. This leads to increased norepinephrine release, which aims to maintain blood pressure and perfusion by increasing heart rate, contractility, and peripheral vasoconstriction. While this helps in the short term, chronic elevation of norepinephrine damages the heart, promotes remodeling, and increases the risk of arrhythmias. So, the neurohormonal response is best described by increased norepinephrine.

Note: RAAS activation also occurs (raising aldosterone and angiotensin II), which promotes sodium and water retention and further vascular changes, but the statement that directly reflects the neurohormonal drive in this context is the rise in norepinephrine.