Anorexia nervosa electrocardiogram
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Joseph Nasr, M.D.[2]
Overview
Electrocardiographic abnormalities in anorexia nervosa reflect the cardiovascular effects of malnutrition, electrolyte disturbances, and altered autonomic tone. ECG evaluation is an essential component of the medical assessment, as abnormalities may indicate life-threatening cardiac instability, even in individuals who appear clinically well.[1][2][3][4]
Common ECG Findings
The most frequently observed electrocardiographic abnormalities include:
- Sinus bradycardia
- Common at rest due to increased vagal tone and reduced metabolic demand[1]
- Prolonged corrected QT (QTc) interval
- Increases risk of ventricular arrhythmias and sudden cardiac death[1]
- Low-voltage QRS complexes
- Related to reduced cardiac muscle mass and loss of subcutaneous tissue[1]
ECG Abnormalities Associated With Electrolyte Disturbances
Electrolyte abnormalities commonly seen in anorexia nervosa, particularly in individuals with purging behaviors or during refeeding, may produce additional ECG changes:
- Hypokalemia
- QT prolongation
- U waves
- Ventricular arrhythmias[5]
- Hypomagnesemia
- Increased susceptibility to torsades de pointes[1]
- Hypocalcemia
- QT interval prolongation[1]
These abnormalities may occur even with modest electrolyte derangements and warrant prompt evaluation.
Clinical Significance
- ECG abnormalities may be present even when laboratory values appear near normal
- QTc prolongation and severe bradycardia are markers of increased risk for:
- Syncope
- Ventricular arrhythmias
- Sudden cardiac death[1]
- ECG findings are incorporated into criteria for higher levels of care, including hospitalization[2][3][4]
Monitoring Considerations
- Baseline ECG is recommended in individuals with suspected or confirmed anorexia nervosa
- Repeat ECGs are indicated:
- With worsening malnutrition
- During refeeding
- When electrolyte abnormalities are present
- When medications affecting cardiac conduction are prescribed[2]
Summary
Electrocardiographic abnormalities in anorexia nervosa are common and clinically significant. Sinus bradycardia and QTc prolongation are the most characteristic findings and may precede serious cardiac complications. ECG assessment is a critical tool for identifying medical instability and guiding level-of-care decisions.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 SøebyM, Gribsholt SB, Clausen L, Richelsen B. Fracture risk in patients with anorexia nervosa over a 40-year period. J Bone Miner Res. 2023;38(11): 1586-1593. doi:10.1002/jbmr.4901
- ↑ 2.0 2.1 2.2 American Psychiatric Association. Practice Guideline for the Treatment of Patients With Eating Disorders. 4th ed. American Psychiatric Association Publishing; 2023.
- ↑ 3.0 3.1 Hornberger LL, Lane MA; Committee on Adolescence. Identification and management of eating disorders in children and adolescents. Pediatrics. 2021;147(1):e2020040279. doi:10.1542/ peds.2020-040279
- ↑ 4.0 4.1 Society for Adolescent Health and Medicine. Medical management of restrictive eating disorders in adolescents and young adults. J Adolesc Health. 2022;71(5):648-654. doi:10.1016/j.jadohealth.2022. 08.006
- ↑ Nitsch A, Dlugosz H, Gibson D, Mehler PS. Medical complications of bulimia nervosa. Cleve Clin J Med. 2021;88(6):333-343. doi:10.3949/ccjm.88a. 20168