A nurse is caring for an 18-year-old female client with anorexia nervosa who has been admitted to the medical unit with severe dehydration and electrolyte imbalances. The client's BMI is 14.2 kg/m², and she has been refusing meals for the past 3 days. Which nursing action should be the highest priority to ensure client safety?

The client has life-threatening complications (severe bradycardia, hypotension, hypokalemia, hyponatremia) requiring immediate cardiac monitoring and medical stabilization before psychological interventions.

Clinical Context and Initial Assessment

This client presents with a classic and severe manifestation of anorexia nervosa (AN). The combination of a critically low BMI of 14.2 kg/m², severe dehydration, electrolyte imbalances, and active food refusal for 3 days signals a state of profound medical instability. In such cases, the body has entered a starvation state, leading to catabolism of muscle tissue, including the myocardium, and dangerous shifts in fluid and electrolytes. These physiological derangements create an immediate, life-threatening risk for cardiovascular collapse, making medical stabilization the absolute priority over all psychological or behavioral interventions.

Physiological Rationale for Priority Action

The highest priority is derived from the pathophysiology of starvation and its impact on the heart. In severe AN, malnutrition leads to myocardial atrophy, a loss of cardiac muscle mass that reduces the heart's contractile strength. This is compounded by electrolyte disturbances, particularly hypokalemia, hypomagnesemia, and hypophosphatemia, which are common in this population and directly disrupt cardiac electrical conduction. The result is a highly irritable myocardium prone to life-threatening arrhythmias. A case report on cardiovascular complications in AN describes a patient with a similar BMI of 14 kg/m² who developed severe sinus bradycardia, a direct consequence of this malnutrition-induced myocardial atrophy and metabolic slowdown ^[2]. This bradycardia can easily degenerate into more lethal rhythms. Furthermore, research on cardiogenic shock in AN patients demonstrates that this myocardial vulnerability can progress to complete cardiovascular failure, a condition termed cardiogenic shock, where the heart is too weak to perfuse vital organs ^[4]. Continuous cardiac monitoring is the only way to immediately detect these conduction delays and arrhythmias, allowing for rapid intervention.

Analysis of Incorrect Options

The other options represent important components of a comprehensive, multidisciplinary treatment plan for AN, but they are not the immediate safety priority for a medically unstable client. Initiating a behavior modification program (Option 1) and providing nutritional education (Option 2) are long-term therapeutic strategies. In the acute phase of severe malnutrition, the client’s cognitive function is often impaired by starvation, and their psychological rigidity regarding food is profound. These interventions are ineffective and ethically inappropriate when the client is at imminent risk of cardiac arrest. Similarly, establishing a therapeutic relationship (Option 3) is foundational to psychiatric care but does not address the acute physiological threat. The medical complications must be stabilized first; psychological exploration is initiated only after medical safety is ensured. This is supported by the concept of distinguishing medical complications from psychiatric symptoms, such as differentiating starvation-induced liver injury from refeeding syndrome, where treatment strategies and monitoring differ significantly .

Synthesis and Clinical Judgment

The clinical decision-making follows the ABC (Airway, Breathing, Circulation) and safety hierarchy fundamental to NCLEX-RN prioritization. The client’s circulatory status is the most unstable element. The risk for a fatal arrhythmia or cardiogenic shock secondary to electrolyte imbalances and a weakened myocardium is immediate and predictable based on the presented data. The narrative review on eating disorders emphasizes that the pediatrician or primary provider must first identify and manage medical complications, as these can be fatal before any psychiatric treatment is effective . Therefore, the nurse’s highest priority is to implement continuous cardiac monitoring and prepare for medical interventions such as electrolyte replacement protocols, which must be administered cautiously to avoid refeeding syndrome, another life-threatening complication. This action directly mitigates the greatest threat to the client’s survival.