Medical and Psychiatric Features of Patients Hospitalized for Severe Restrictive Eating Disorders: Analysis of 545 Consecutive Patients with Severe Anorexia Nervosa or Avoidant/Restrictive Food Intake Disorder

Background People with severe eating and feeding disorders regularly require hospitalization due to complications inherent to their disease, though formal training regarding this care is limited. Methods This retrospective study included 545 patients with severe anorexia nervosa (AN) or avoidant restrictive food intake disorder hospitalized in a medical stabilization unit between 2018 and 2021. Biometrics were obtained throughout hospitalization. Nutrition was increased until patients were gaining 0.2 kg/day. Results Average admission body mass index was 13 kg/m2 with diagnoses of 46% AN-R (restricting), 39% AN-BP (binge-purge), and 15% avoidant restrictive food intake disorder. Average daily Kcals by discharge were 3343 for females and 3962 for males; 26% required nasogastric feeding. Hypoglycemia was common until day 7, correlated with elevated liver function tests and low prealbumin. Liver function tests were abnormal in 31% of patients. Refeeding hypophosphatemia developed in 26% of patients starting day 2 and was associated with lower body mass index. Hypokalemia appeared on admission among 39%, twice as common in patients diagnosed with AN-BP. Initial electrocardiograms were abnormal in 50% of patients, usually sinus bradycardia. Average QTc was normal, but only 14% prolonged. Bone density testing revealed 70% osteoporosis. History of suicide attempts were present in 19%, while 76% and 50% presented with anxiety and depressive disorders, respectively. Conclusions Given the inextricability of medical complications from severe eating and feeding disorders, familiarity among consult-liaison psychiatrists with the prevalence of frequently observed abnormal findings can inform consultation, prevent adverse events, prevent unnecessary intervention, and facilitate weight restoration and medical stabilization.