Which polysomnographic finding is most consistently observed in patients with major depressive disorder?
- A Shortened REM latency ✓
- B Prolonged REM latency
- C Increased total sleep time
- D Decreased slow-wave sleep in the second half of the night
Correct answer: A. Shortened REM latency
Explanation
Shortened REM latency, meaning a reduced time from sleep onset to the first REM period, is the most consistent polysomnographic abnormality in depression. Other findings include reduced slow-wave sleep and increased REM density. Prolonged REM latency is not characteristic of depression.
Reference: Kaplan and Sadock's Synopsis of Psychiatry, 12th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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