What is a common EKG finding in patients with anorexia nervosa?

Sinus bradycardia is a common electrocardiogram (EKG) finding in patients with anorexia nervosa due to multiple factors associated with the disorder. Anorexia nervosa often leads to malnutrition and electrolyte imbalances, particularly hypokalemia and hypomagnesemia, which can influence heart rate. The physiological response to starvation and decreased body mass can also cause a decrease in metabolic rate, including a reduction in heart rate.

Bradycardia in this context reflects the body's adaptation to low caloric intake and metabolic stress, conserving energy by slowing down the heart rate. Additionally, the autonomic nervous system's balance can be affected, often leading to heightened vagal tone, which can further promote heart rate slowing.

In contrast, sinus tachycardia might be expected in cases of anxiety or stress but is less common in anorexia when the body is in a state of starvation. Heart block and atrial fibrillation are less frequently associated with anorexia nervosa and are typically linked to more specific cardiac issues or severe electrolyte disturbances. Therefore, recognizing sinus bradycardia as a common EKG finding helps clinicians monitor and manage potential cardiac complications in patients with anorexia nervosa.