A nurse is caring for a client with bulimia nervosa who has been admitted to the medical unit for electrolyte imbalances. Which assessment finding would be the priority concern requiring immediate intervention?

Severe hypokalemia (K+ 2.8 mEq/L) with cardiac dysrhythmias is life-threatening and requires immediate intervention to prevent cardiac arrest, prioritizing over other bulimia-related findings.

Core Nursing Explanation Key Concept Analysis: This question tests the nurse's ability to prioritize life-threatening complications in a patient with Bulimia Nervosa. The core theme is prioritization using the ABCs (Airway, Breathing, Circulation) and Maslow's Hierarchy of Needs. While all findings are significant in the context of bulimia, the nurse must identify which one poses an immediate threat to life and requires urgent intervention.

Answer Rationale: The correct answer is ② Serum potassium level of 3.0 mEq/L with cardiac dysrhythmias. Key Point! Hypokalemia (low potassium, normal range 3.5-5.0 mEq/L) is a direct consequence of purging behaviors (vomiting, laxative/diuretic abuse). Potassium is critical for normal cardiac muscle function. Severe hypokalemia can lead to life-threatening cardiac dysrhythmias, such as ventricular tachycardia or fibrillation, which can progress to cardiac arrest. The presence of dysrhythmias indicates the electrolyte imbalance is already affecting cardiac conduction, making this a circulation (C in ABCs) emergency.

Distractor Analysis:
• Watch out for confusion! ① Dental erosion and enlarged parotid glands: These are classic physical signs of chronic self-induced vomiting. While important for assessment and long-term care planning, they are not immediately life-threatening.
• ③ Body weight 15% below ideal body weight: This indicates significant malnutrition and is a criterion for Anorexia Nervosa. In bulimia, patients are often at a normal or near-normal weight. While concerning, severe weight loss is a more chronic issue; the acute electrolyte imbalance takes precedence.
• ④ Reports of using laxatives and diuretics daily: This confirms the diagnosis and explains the mechanism for the electrolyte imbalances. It is crucial assessment information but is not in itself an acute physiological crisis requiring "immediate intervention." The consequence of this behavior (the dysrhythmia) is the priority.

Related Concepts: The pathophysiology links purging → loss of gastric acid (H+, Cl-, K+) and intestinal fluids (K+, Mg2+) → metabolic alkalosis and hypokalemia → increased cardiac irritability. Nursing priorities always follow: Life-threatening physiological instability > Safety > Psychological issues > Long-term health problems.
Concept Summary • Priority Setting: ABCs (Airway, Breathing, Circulation), Maslow's Hierarchy (Physiological needs first).
• Bulimia Nervosa: Eating disorder characterized by binge-eating followed by compensatory purging (vomiting, laxatives, diuretics, excessive exercise).
• Key Complication: Electrolyte imbalances (Hypokalemia, hypochloremia, metabolic alkalosis).
• Life-Threatening Risk: Cardiac dysrhythmias due to hypokalemia.

Side-by-Side Comparison!

Assessment Finding	Clinical Significance	Priority Level
Cardiac Dysrhythmia with Hypokalemia	Immediate threat to circulation and life; requires IV potassium, cardiac monitoring.	HIGHEST (Immediate)
Severe Underweight (Anorexia)	Chronic malnutrition risk; requires nutritional rehabilitation but is not an acute emergency.	High (Urgent, but not immediate life-threat)
Report of Purging Behaviors	Diagnostic confirmation; target for therapeutic intervention and education.	Moderate (Important for plan of care)
Dental Erosion / Parotid Swelling	Chronic physical sequelae; requires dental referral and indicates illness duration.	Low (Long-term health issue)

Anatomy, Physiology & Pharmacology Points • Potassium (K+): Major intracellular cation. Essential for maintaining the resting membrane potential of cells, especially cardiac and muscle cells. Low levels make the heart muscle hyperexcitable, leading to dysrhythmias.
• Purging Pathophysiology: Vomiting loses HCl (acid), leading to Metabolic Alkalosis. The kidneys excrete potassium (K+) and hydrogen (H+) to retain sodium (Na+) and bicarbonate (HCO3-), worsening hypokalemia.
• Intervention: IV potassium chloride (KCl) replacement. Must be diluted and infused slowly (e.g., no more than 10 mEq/hr on a general floor) to prevent fatal hyperkalemia and cardiac arrest.
Memory Tips • Mnemonic: "BULIMIA hurts your Beauty (teeth, glands) and your Beats (heart). The Beats come first!"
• Association: Think of the heart as a potassium-dependent battery. Low battery = erratic signals (dysrhythmias). Always check the "battery level" (K+) in purging patients.
High-Frequency NCLEX Topics This is a classic NCLEX question combining Mental Health (Eating Disorders) with Medical-Surgical (Fluid & Electrolytes, Cardiac). The exam consistently tests:
1. Prioritization of physiological stability over psychological or chronic issues.
2. Recognition of life-threatening complications of common disorders.
3. Interpretation of lab values (K+ < 3.5 mEq/L) in a clinical context.
Watch Out for Question Variations! • Instead of "priority concern," the question could ask: "Which finding requires notifying the provider immediately?" (Same answer).
• It could shift to intervention: "The nurse should prepare to administer which medication first?" (IV Potassium Chloride).
• It could focus on monitoring: "Which client should be placed on continuous cardiac monitoring?" (The one with hypokalemia and reported palpitations).

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse on a medical unit. A 22-year-old female is admitted with weakness and palpitations. She has a history of bulimia nervosa. Her initial ECG shows frequent premature ventricular contractions (PVCs).

Nursing Intervention Strategy:
1. Immediate Assessment (ABCs): Assess airway, breathing, and circulation (apical pulse for full minute, blood pressure, capillary refill). Connect to continuous cardiac monitor. Obtain STAT Electrolyte panel.
2. Priority Intervention: Upon receiving lab results showing K+ = 3.0 mEq/L, anticipate an order for IV potassium replacement. Ensure IV access is patent to prevent extravasation, which can cause tissue necrosis.
3. Ongoing Monitoring & Safety: Monitor ECG rhythm continuously. Assess for worsening dysrhythmias. Implement fall precautions due to muscle weakness from hypokalemia. Maintain a non-judgmental, therapeutic relationship to build trust.
4. Patient Education & Discharge Planning: Once stable, collaborate with dietitian and mental health. Educate on dangers of purging, importance of nutrition, and potassium-rich foods (bananas, oranges, potatoes, spinach).

Patient Safety and Precautions:
• IV Potassium Administration: Key Point! Never give IV push potassium – it is fatal. Always dilute in IV bag. Infuse slowly per protocol (e.g., 10 mEq over 1 hour). Monitor the IV site closely. Monitor for hyperkalemia signs (peaked T waves, muscle weakness, nausea).
• Cardiac Monitoring: Understand basic dysrhythmia recognition. Report new or worsening dysrhythmias immediately.
• Psychological Safety: Do not focus solely on weight or food. Mealtimes can be highly stressful. Use a consistent, supportive approach.
Nursing Procedure & Medication Flow Procedure: Administering IV Potassium Chloride (KCl)
1. Verify order: Dose, concentration, infusion rate.
2. Check compatibility with existing IV fluid.
3. Prime IV tubing with the potassium-containing solution to avoid a bolus.
4. Use an infusion pump for precise control.
5. Label the IV line "Contains Potassium."
6. Assess IV site for patency and signs of infiltration (pain, swelling, redness) before and during infusion.
7. Monitor patient's cardiac rhythm, vital signs, and serum potassium levels during and after infusion.
8. Educate patient to report pain at IV site, palpitations, or unusual sensations immediately.
A Word from Your Senior Nurse "In the real world, a patient with bulimia might be admitted to your med-surg floor for 'weakness' or 'abnormal labs.' Your keen assessment skills are what connect the dots. That ECG monitor isn't just a screen with squiggly lines – it's a direct window into the patient's cardiac stability, which is being threatened by their electrolyte imbalance. When you see hypokalemia and any irregular heartbeat, your internal alarm bells should ring loudest. Prioritizing the heart is always the right call. Remember, stabilizing the body is the first and most critical step before any psychological healing can truly begin."