What is the recommended treatment for sinus bradycardia?

The recommended treatment for sinus bradycardia often involves the administration of oxygen and atropine. Sinus bradycardia is characterized by a slow heart rate, typically below 60 beats per minute, which can lead to inadequate perfusion and subsequent symptoms such as dizziness, weakness, or syncope.

Administering oxygen helps ensure that the body receives adequate oxygenation, which is crucial if the bradycardia is causing a decrease in cardiac output. Atropine is an anticholinergic medication that increases the heart rate by inhibiting the activity of the vagus nerve on the heart's pacemaker, particularly useful in symptomatic bradycardia to alleviate symptoms and improve hemodynamic stability.

The other options provided may not be appropriate for managing sinus bradycardia. Initiating CPR is reserved for cardiac arrest situations, where there is no pulse or breathing; it is not indicated for a patient who has bradycardia yet is still responsive. Starting a beta-blocker would further slow the heart rate, which is contraindicated in the case of bradycardia. Adjusting fluid intake may be beneficial in other clinical scenarios but does not directly address the rhythm disturbance or its associated symptoms in sinus bradycardia.