The nurse is administering the angiotensin II receptor antagonist valsartan. Which physiological response causes its therapeutic effect?

A) Chronotropic effect: This term refers to changes in heart rate. Angiotensin II receptor antagonists like valsartan primarily affect blood pressure and vascular tone, rather than directly altering heart rate. B) Diuresis: Diuresis involves increased urine production. Although some antihypertensives can have a diuretic effect, valsartan primarily works through mechanisms other than increasing urine output. C) Vasodilation: Angiotensin II receptor antagonists such as valsartan work by blocking the action of angiotensin II, which leads to vasodilation. This reduction in vascular resistance helps to lower blood pressure and is the primary therapeutic effect of valsartan. D) Sympatholytic action: This refers to the suppression of sympathetic nervous system activity. Valsartan does not primarily act through sympathetic nervous system modulation but rather through direct vasodilation by blocking angiotensin II receptors.