Valsartan

Valsartan is an angiotensin II receptor blocker that lowers blood pressure and is used for heart failure and after certain heart attacks.

Angiotensin II receptor: A cell-surface receptor through which angiotensin II constricts blood vessels and promotes aldosterone release. Valsartan blocks the AT1 subtype, interrupting major effects of angiotensin II.
Hypertension: Persistently elevated arterial blood pressure that increases cardiovascular risk. Valsartan lowers blood pressure and is prescribed to treat this condition.
ACE inhibitor: A drug that inhibits angiotensin-converting enzyme, reducing angiotensin II formation. ACE inhibitors suppress the same hormonal pathway upstream, but valsartan blocks its receptor.
VALIANT trial: A randomized trial comparing valsartan, captopril, and their combination after myocardial infarction with left ventricular dysfunction. It tested valsartan directly against an ACE inhibitor in high-risk post-infarction patients.
Renin–angiotensin system: A hormonal network that regulates blood pressure, fluid balance, and sodium retention. Valsartan acts on this system's signaling pathway to reduce vascular and hormonal pressure effects.
Heart failure: A syndrome in which the heart cannot pump or fill well enough to meet the body's needs. Valsartan is used in selected patients to reduce strain on the failing heart.
Losartan: An angiotensin II receptor blocker used to treat hypertension and certain other cardiovascular conditions. Losartan is a closely related drug in the same class, with different dosing and pharmacologic properties.
Val-HeFT: A clinical trial evaluating valsartan in patients with chronic heart failure. It assessed whether adding valsartan improved outcomes in established heart failure.
Aldosterone: A steroid hormone that increases sodium retention and potassium excretion by the kidneys. Blocking angiotensin signaling reduces aldosterone release, changing salt and potassium balance.
Myocardial infarction: Heart muscle injury caused by prolonged interruption of its blood supply. Valsartan can be prescribed after an infarction in patients with left ventricular dysfunction or heart failure.

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