A patient entered the local emergency room and had an EKG taken. The attending physician stated that the patient had an A.V nodal rhythm. What is the likely heart rate? 1. \( 30 / \mathrm{min} \) 2. \( 50 / \mathrm{min} \) 3. \( 65 / \mathrm{min} \) 4. \( 75 / \mathrm{min} \) 1.. 2.. 3.. 4..

In A.V nodal rhythm, the heart rate typically ranges from 40 to 60 beats per minute. This rhythm occurs when the atrioventricular (A.V) node takes over as the pacemaker when the higher pacemakers (sinoatrial node) fail to generate impulses adequately. Given this information, the most likely heart rate from the options provided would be \( 50 / \mathrm{min} \). Additionally, the A.V nodal rhythm often produces a more regular heartbeat compared to other junctional rhythms, making it easier to identify on an EKG. This rhythm can occur in various clinical scenarios, such as during bradycardia or following myocardial infarction, which means prompt assessment and management are essential in an emergency setting.