Final answer:
The nurse's priority intervention when caring for a client in shock of unknown etiology and observing a rhythm on the right on the monitor is to administer an intravenous saline bolus (option C).
Step-by-step explanation:
The nurse's priority intervention when caring for a client in shock of unknown etiology and observing a rhythm on the right on the monitor is to administer an intravenous saline bolus (option C). Shock is a life-threatening condition that occurs when there is a disruption in blood flow, leading to insufficient oxygen and nutrients reaching the tissues. Intravenous saline bolus helps to replenish circulating volume, improve blood flow, and support vital organ function.
Checking for a carotid pulse (option A) is important, but administering intravenous saline bolus takes precedence as it directly addresses the underlying issue of shock. Defibrillation (option B) is not indicated in this scenario as the rhythm on the monitor does not suggest a life-threatening arrhythmia. Giving two breaths via an Ambu bag (option D) is a measure taken during cardiopulmonary resuscitation (CPR) and is not the immediate priority in this case.
Administering a defibrillation shock with an AED may require pre-established settings that determine the appropriate energy level; these settings are not typically as high as 360 joules for initial shocks.
If the client is still experiencing cardiac activity but with signs of clinical deterioration, checking for a carotid pulse (to determine if there is effective circulation) and providing supportive interventions such as an intravenous saline bolus or airway support may be appropriate.