Eating Disorder & Electrolyte Imbalances: Anorexia Case Study
This case study examines the clinical management of a 16-year-old patient presenting with anorexia nervosa, self-injurious behavior, depressive symptoms, and critical electrolyte imbalances. The paper traces the nurse's systematic assessment process — from relevant personal and social history through vital signs, physical and mental status evaluation, EKG interpretation, and laboratory findings — to identify priority nursing diagnoses and care interventions. It addresses collaborative medical management, including IV fluid resuscitation, potassium and magnesium replacement, cardiac monitoring, and antiarrhythmic therapy. Mental health priorities, therapeutic communication strategies, and discharge education planning are also discussed, culminating in nurse-to-provider and nurse-to-nurse SBAR handoffs.
- Personal and Social History: Clinical Relevance: Identifying personal, biological, and social risk factors
- Patient Assessment: Vital Signs, Physical Findings, and Labs: Vital signs, physical exam, EKG, and critical lab values
- Clinical Reasoning and Medical Management: Primary diagnosis, pathophysiology, and priority care orders
- Mental Health and Physical Nursing Priorities: Nursing diagnoses, interventions, and therapeutic communication
- Evaluation and Cardiac Complication Management: Post-intervention evaluation and cardiac arrhythmia response
- SBAR Communication and Discharge Planning: Nurse handoffs, discharge education, and reflective practice
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What makes this paper effective
- Systematically links each clinical finding to its significance, helping readers understand not just what data is present but why it matters for patient care decisions.
- Integrates both physical and mental health priorities within a single case, reflecting the real-world complexity of eating disorder nursing practice.
- Uses structured frameworks — SBAR, NANDA-I nursing diagnoses, priority-ordered interventions — that mirror actual clinical documentation, adding authenticity and practical value.
Key academic technique demonstrated
The paper demonstrates clinical reasoning through a domino-effect pathophysiology model, tracing how an initial condition (anorexia nervosa rooted in low self-esteem and trauma) generates cascading complications including hypokalemia, hypomagnesemia, and ultimately cardiac arrhythmia. This cause-and-effect reasoning anchors each subsequent intervention in a coherent physiological rationale.
Structure breakdown
The case study follows a standard nursing clinical-reasoning sequence: history gathering → patient assessment → lab interpretation → priority-setting → collaborative medical orders → nursing interventions (mental and physical) → evaluation → SBAR communication → discharge planning → reflective practice. Each section builds directly on the previous one, mirroring the actual progression of a clinical shift.
Personal and Social History: Clinical Relevance
Relevant Data from Present Problem
The clinically significant data from the patient's present problem includes self-injurious behavior (SIB), increasing weakness, lightheadedness, and the likelihood of a syncopal episode. This information helps identify personal and biological factors contributing to the patient's current condition.
Relevant Data from Social History
Key social history data includes a history of sexual abuse by her stepfather, living with a single mother, and current sexual behaviors. This information helps identify social and family factors that may be contributing to the patient's condition.
Past Medical History and Current Medications
Anorexia nervosa, depression, self-injurious behavior (SIB), and a history of childhood sexual abuse constitute the patient's past medical history (PMH). Her current home medication is Citalopram 20 mg PO daily, a Selective Serotonin Reuptake Inhibitor (SSRI). The expected outcome of this medication is reduction of depressive and eating disorder symptoms and protection against recurrence.
Domino Effect of Disease Progression
One disease process often influences the development of other illnesses. Based on pathophysiological principles, the childhood sexual abuse likely developed first, creating a domino effect that contributed to the emergence of low self-esteem, anorexia nervosa, depression, and self-injurious behavior over time.
Patient Assessment: Vital Signs, Physical Findings, and Labs
Vital Signs
Relevant vital sign data includes a temperature of 96.2°F / 35.7°C (oral) and a blood pressure of 86/44 with a MAP of 58. These findings are clinically significant because low body temperature and low blood pressure are indicators of hypothermia and hypotension — both recognized vital sign abnormalities associated with anorexia nervosa.
Physical Assessment
Relevant physical assessment data includes the absence of menses for the past six months, dry skin with lanugo body hair, thinning hair on the head, and vertical lacerations on the forearms and thighs. These findings are clinically significant for the diagnosis of anorexia nervosa and its associated domino conditions.
Mental Status Examination (MSE)
Relevant MSE data includes an emaciated appearance, generalized weakness, symptoms of depression, lack of eye contact, suicidal ideation, and poor insight and judgment. These findings are significant for diagnosing the mental health issues affecting the patient. Initial EKG rhythm interpretation indicated a regular heart rate, with regular intervals between R waves, which serves as a baseline for identifying any abnormal cardiac components.
Lab Results
Complete Blood Count (CBC)
The relevant lab finding is hemoglobin (normal range: 12–16 g/dL), which slightly exceeds the normal range. Trend: Stable.
Basic Metabolic Panel (BMP)
Relevant values include Sodium (135–145 mEq/L), Potassium (3.5–5.0 mEq/L), Chloride (95–105 mEq/L), CO2/Bicarbonate (21–31 mmol/L), Glucose (70–110 mg/dL), BUN (7–25 mg/dL), and Creatinine (0.6–1.2 mg/dL). These results help explain the patient's generalized weakness and other vital sign abnormalities. Trend: Worsening.
Liver Function Tests
All liver function test results are within normal range, indicating no current abnormalities in liver function. Trend: Stable.
Miscellaneous Labs and Thyroid Profile
Relevant values include Magnesium (normal range: 1.6–2.0 mEq/L) and Phosphorus (normal range: 2.5–4.5 mg/dL). These labs are significant for identifying electrolyte disturbances. Trend: Stable.
Urinalysis
All urinalysis values are within normal range. Clinical significance: detection of any urinary tract symptoms. Trend: Stable.
Priority Lab Planning
Potassium: Value 1.9 mEq/L (critical value: 3.7 mEq/L). A potassium level this low indicates hypokalemia. Required nursing assessments and interventions include management of vomiting tendencies, which cause ongoing potassium loss.
Magnesium: Value 1.2 mEq/L (critical value: 1.7 mEq/L). This critically low magnesium level indicates hypomagnesemia. Required nursing intervention is magnesium replacement therapy.
Clinical Reasoning and Medical Management
Primary Problem and Pathophysiology
The primary problem the patient is presenting with is anorexia nervosa. The underlying cause and pathophysiology of this primary problem involve low self-esteem, relationship problems, and stressful life events.
Collaborative Care: Medical Management Orders
The following care provider orders, their rationales, and expected outcomes have been identified:
- Pelvic exam and cultures to assess for STDs: The patient is sexually active. Expected outcome: rule out STDs.
- Establish peripheral IV ×2: The patient has shown signs of electrolyte imbalances. Expected outcome: electrolyte replenishment.
- 0.9% Normal Saline (NS) 1000 mL IV bolus: Anorexia nervosa is associated with electrolyte imbalances and various cardiac conditions. Expected outcome: electrolyte replenishment.
- Continuous cardiac monitor: To detect any irregular heartbeats and cardiac conditions associated with the patient's condition.
- Magnesium sulfate 4 g IVPB over 4 hours, with potassium recheck per hospital protocol: Patient shows critically low magnesium. Expected outcome: magnesium replacement.
- Potassium Chloride 10 mEq IVPB ×4, each dose over 1 hour, with potassium recheck per hospital protocol: Patient shows critically low potassium. Expected outcome: potassium replacement.
- Mental health assessment and referral: Required given the patient's depressive symptoms and self-injurious behaviors. Expected outcome: detection of any underlying mental health issues.
- 1:1 sitter/security watch: Continuous patient assessment to identify changes in the patient's status and condition.
Priority Setting: Order of Implementation
The following priority order was established for implementing care provider orders:
- 0.9% Normal Saline (NS) 1000 mL IV bolus — Patient has shown signs of electrolyte imbalances requiring immediate fluid resuscitation.
- Magnesium sulfate 4 g IVPB over 4 hours — Magnesium replacement must precede potassium replacement for effective correction.
- Potassium Chloride 10 mEq IVPB ×4 — Patient shows critically low potassium levels.
- Continuous cardiac monitor — Signs of irregular heartbeat require urgent attention to improve cardiac wellbeing and prevent further complications.
- Establish peripheral IV — Essential for medication and fluid administration.
- 1:1 sitter/security watch — Treatment requires continuous monitoring to determine effectiveness and to guide any necessary changes.
Mental Health and Physical Nursing Priorities
Therapeutic Rapport and Communication
The nurse can establish a therapeutic rapport in this setting by demonstrating genuine interest in the patient's life. Using a persuasive yet empathetic approach, the nurse should provide insights regarding the disorder and clearly explain his or her role in the patient's care. Key principles of therapeutic communication relevant to this situation include keeping the patient as the primary focus of interaction, maintaining a professional attitude, using self-disclosure cautiously, and avoiding the development of a social relationship with the patient.
To explore the patient's comments suggesting suicidal ideation, the nurse should ask direct but compassionate questions about her feelings regarding life and any thoughts of suicide.
Mental Health Nursing Priorities
The following mental health nursing priorities will guide the plan of care:
- Mood and affect
- Depressive symptoms
- Suicidal ideation
Nursing interventions based on these priorities include:
- Cognitive-behavioral intervention: To address altered mood, perceptions, and depressive symptoms. Expected outcome: improved patient engagement in the care process and reduction of depressive symptoms.
- Supportive psychotherapy: To address the patient's lived experience and its emotional impact. Expected outcome: enhanced patient commitment to the recovery process.
Physical Nursing Priorities
Physical nursing priorities, listed in order of priority, include:
- Disturbed body image
- Poor eating habits
- Self-care deficit
Nursing interventions based on these physical priorities include:
- Patient education: Patients with anorexia nervosa often have limited information about the condition and how to cope with it. Expected outcome: enhanced involvement in care and self-care practices through being fully informed.
- Nutritional interventions: Promoting appropriate eating habits is essential in the management of anorexia nervosa. Expected outcome: development of suitable eating behaviors and habits.
- Motivational enhancement therapy: A positive self-image is critical to avoiding depressive symptoms and self-injurious behaviors. Expected outcome: improved self-esteem.
Body Systems and Complication Anticipation
The body systems requiring the most thorough assessment based on the primary concern are body mass index and the cardiovascular system. The worst possible complication to anticipate is electrolyte imbalance and an irregular heartbeat. Early identification of these complications relies on basic metabolic panel assessment and cardiac monitoring. If these complications develop, nursing intervention involves the administration of recommended medications and continued close monitoring.
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