Question

The client asks how atenolol helps angina. The response provided by the nurse is based on which concept? This medication

a. Slows the heart rate and reduces contractability
b. Increases the heart rate and diminishes contractability
c. Blocks sodium channels and elevates depolarization
d. Decreases blood pressure and blocks the alpha2 receptors

Answer 1

Atenolol is a beta-blocker that helps relieve angina by slowing the heart rate and reducing myocardial contractility, which decreases the oxygen demand of the heart.

Step-by-step explanation:

Atenolol, a beta-blocker, helps to manage angina by interfering with the action of adrenaline on the heart. It binds to beta-1 receptors, which slows the heart rate (HR) and reduces myocardial contractility, also known as a negative inotropic effect. This decrease in heart rate and contractility reduces the oxygen demand of the heart muscles, alleviating the pain associated with angina. Atenolol does not significantly affect sodium channels or alpha2 receptors, and while it can decrease blood pressure, this is not its primary mechanism for helping with angina.