A. Reporting the findings and anticipating a prescription for amiodarone may be necessary later, but the first step is to assess the patient's immediate condition (unresponsiveness, pulse status, etc.).
B. Although increasing monitor sensitivity and initiating a rapid response call might be helpful, these actions come after assessing the patient’s condition. If the patient is in distress or unresponsive, the nurse needs to check for a pulse and intervene right away.
C. This is a crucial action if the patient is unresponsive and pulseless (cardiac arrest). If the patient is found to be unresponsive and pulseless, starting chest compressions immediately and preparing for defibrillation is the next step. However, the first action is to check for pulse and responsiveness.
Why it's incorrect: Compressions and defibrillation are correct actions if the patient is pulseless, but before taking these steps, the nurse must assess the patient for responsiveness and check the carotid pulse. Starting CPR and preparing defibrillation without verifying the patient's condition could delay appropriate care.
D. Checking responsiveness and pulse is the most immediate and critical action because VT may be asymptomatic or cause deterioration, including cardiac arrest. Once pulse and responsiveness are determined, appropriate interventions (such as defibrillation or CPR) can be initiated quickly.

A. Mobitz II is a type of second-degree AV block characterized by constant PR intervals and sudden dropped QRS complexes (i.e., the PR interval does not lengthen progressively). This is a more serious block because the dropped beats are unpredictable and could lead to complete block.
B. Sinus bradycardia is a slower-than-normal heart rate (usually less than 60 beats per minute) that originates from the sinus node. First-degree AV block is characterized by a prolonged PR interval, but unlike second-degree block, there are no dropped QRS complexes.
C. Mobitz I (Wenckebach) is a second-degree AV block where the PR interval gradually lengthens with each successive beat until a QRS complex is dropped. After the dropped beat, the cycle repeats. This is a relatively benign block and often resolves without intervention, though it requires monitoring.
D. Third-degree heart block (also known as complete heart block) occurs when there is no communication between the atria and ventricles. The atria and ventricles beat independently of each other. There are no relationship between the P waves and QRS complexes, and the ventricular rate is typically slower than the atrial rate.