Distinguishing psychotic depression from melancholia

Abstract

We contrast 25 patients with “psychotic depression” (PD) against two age- and sex-matched groups of melancholic depressed patients. In terms of clinical features, specificity to PD was suggested for several features, including delusions, morbid cognitions (involving guilt and a sense of deserving punishment), hallucinations and constipation. In addition, the PDs had significantly higher levels of behaviourally rated psychomotor disturbance. A comprehensive list of risk factors to depression (e.g., socio-demographic, family history, parental influences, medical disorders, anxiety, stressors and personality style) were examined, without clear differentiation between the comparison groups apart from the suggestion that being a “worrier” and having tenuous stability under stress was over-represented in the PDs. Findings favour the view that psychotic depression is a sub-type of melancholic depression (accounting for the similar expression of the majority of clinical and possible aetiological variables across our contrasted `types'). Findings also suggest possible benefits from future phenomenological studies of psychotic depression relying more on observer-based rather than self-report or symptom data sets. Aetiological studies would benefit from focussing on those features identified as distinguishing the condition from melancholic depression.