Which of the following is a cardioselective beta blocker?

Atenolol is a cardioselective beta blocker, which means it primarily affects beta-1 adrenergic receptors located in the heart. This selectivity is significant because it allows atenolol to reduce heart rate and myocardial contractility while minimizing effects on beta-2 adrenergic receptors found in other tissues, such as the lungs. This attribute is particularly beneficial for patients with cardiovascular issues, as it can help manage conditions like hypertension and angina with a lower risk of respiratory side effects, which can be a concern with non-selective beta blockers.

In contrast, lisinopril is an ACE inhibitor, which works primarily by blocking the conversion of angiotensin I to angiotensin II, leading to vasodilation and reduced blood pressure. Amlodipine is a calcium channel blocker that relaxes the blood vessels to lower blood pressure and improve blood flow. Hydrochlorothiazide is a thiazide diuretic that helps prevent your body from absorbing too much salt, leading to decreased fluid retention. Each of these medications serves different therapeutic roles and mechanisms of action in the management of cardiovascular disorders, unlike atenolol, which specifically blocks beta-1 receptors.