Bulimia and major affective disorder: experience with 105 patients

SummarySeveral lines of evidence suggest that bulimia - the syndrome of compulsive binge-eating - may be related to major affective disorder. First, high rates of major affective disorder have been found both among bulimic patients and their relatives. Second, neuroendocrine abnormalities, similar to those found in major affective disorder, have been reported in bulimia. Finally, several antidepressant medications have been shown to be effective in the treatment of bulimia.To investigate further the relationship between bulimia and major affective disorder, we evaluated 105 consecutive patients (101 women, 4 men), meeting DSM III criteria for bulimia, referred to our center, for the following: (1) rates of current or past major affective disorder and other psychiatric disorders, by DSM III criteria, using the NIMH Diagnostic Interview Schedule (n = 105); (2) family history of psychiatric disorders among first-degree relatives, by DSM III criteria (n = 101); (3) response to the 1 mg oral overnight dexamethasone suppression test (DST) with postdexamethasone plasma cortisol level measured at 16 00 h (n = 43); and (4) response to open trials of antidepressant medications, front several different classes - particularly tricyclic antidepressants, monoamine oxidase (MAO) inhibitors, and trazodone (n = 50).The results of these studies were as follows: (1) the bulimic patients displayed a 77% lifetime prevalence rate of major affective disorder by DSM III criteria; (2) the morbid risk for major affective disorder among the firstdegree relatives of the bulimic probands was 0.29, similar to the 0.19 morbid risk found among the first-degree relatives of 40 probands with bipolar disorder, but significantly higher than the 0.03 morbid risk found among the first-degree relatives of 46 schizophrenic probands (P<0.001); (3) the bulimic patients showed a 40% rate of nonsuppression to the DST (16 00 h postdexamethasone plasma cortisol Level≥5.0 mcg/dl), significantly higher than the 9% rate of nonsuppression found among 22 normal control subjects (P<0.02); and (4) after one or more trials of antidepressant medications, 38% of the bulimic patients achieved a remission of symptoms (cessation of bingeeating episodes), 34% achieved a marked response (75-99% reduction in the frequency of binge-eating episodes), 16% achieved a moderate response (50-74% reduction in the frequency of binge-eating episodes), and 12% had no response (less than a 50% reduction in the frequency of binge-eating episodes).Thus, on each of the four indices evaluated, patients with bulimia were similar to patients with major affective disorder, but were distinguishable from patients with other psychiatric disorders and from normal Controls. These results are consistent with the hypothesis that bulimia may be closely related to major affective disorder.