The British Journal of Psychiatry 133: 123-129 (1978)
© 1978 The Royal College of Psychiatrists
Recurrent unipolar depressions with a 48-hour cycle: report of a case
AJ Gelenberg, GL Klerman, EL Hartmann and P Salt
Since 1804 there have been twelve case reports of patients with mood
disorders showing a regular periodicity of 48 hours, eight bipolar and four
unipolar. This paper describes an additional patient, a 57-year- old man
with a 48-hour unipolar cycle. Although his 24-hour serum cortisol pattern
was abnormal, there were few clear-cut biological abnormalities. Possible
mechanisms are discussed, and comparisons made with previous reports of
similar patients.