Why might a nurse administer a beta-blocker to a patient?

Administering a beta-blocker to a patient is primarily aimed at managing hypertension and decreasing heart rate. Beta-blockers work by blocking the effects of adrenaline on the beta receptors in the heart, leading to a reduction in heart rate and myocardial contractility. This not only helps lower blood pressure but also reduces the workload on the heart, making beta-blockers effective in treating various cardiovascular conditions, such as heart failure, angina, and arrhythmias.

In the context of hypertension, beta-blockers decrease cardiac output and inhibit renin release from the kidneys, contributing to blood pressure control. By effectively lowering heart rate, these medications can also alleviate symptoms in patients with tachycardia or those at risk for heart-related complications.

Other options listed do not align with the primary uses of beta-blockers. For example, while they may have a role in anxiety management, this use is not as prevalent or direct as their role in managing cardiovascular issues. Similarly, beta-blockers would not be administered to increase heart rate during physical activity, nor are they indicated for supporting liver function in cirrhosis patients.