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Subjective versus objective evaluation of hypnotic efficacy: experience with zolpidem
M H Kryger1, D Steljes, Z Pouliot
1Section of Respiratory Medicine, University of Manitoba, Winnipeg, Canada.
Sleep
|October 1, 1991
Summary
This study found that zolpidem effectively improved sleep for chronic insomnia patients, aligning subjective reports with objective polysomnography (PSG) findings. While generally correlating, individual patient experiences showed significant variations between subjective feelings and objective sleep data.
Area of Science:
- Sleep Medicine
- Pharmacology
Background:
- Limited research exists on the correlation between subjective and objective hypnotic efficacy.
- Assessing hypnotic effectiveness requires understanding patient perception alongside clinical measurements.
Purpose of the Study:
- To determine the correlation between patient-reported hypnotic efficacy and polysomnographic (PSG) findings.
- To evaluate the efficacy of zolpidem in chronic insomnia patients over an 11-night period.
Main Methods:
- 16 patients with chronic insomnia underwent 11 nights of polysomnography (PSG).
- Patients received placebos (nights 1-2, 10-11) and zolpidem (nights 3-9).
- Daily questionnaires assessed subjective sleep quality, latency, and total sleep time post-PSG.
Main Results:
- Zolpidem significantly reduced sleep latency, increased total sleep time, and improved sleep efficiency compared to placebo.
- Subjective patient reports generally correlated with objective PSG findings regarding sleep latency and total sleep time.
- Individual patient data showed notable discrepancies between subjective and objective measures, despite high group correlation.
Conclusions:
- Polysomnography (PSG) remains crucial for evaluating hypnotic efficacy.
- While zolpidem demonstrates objective and subjective benefits, individual variability in perception versus reality warrants attention.
- Subjective measures of sleep quality and morning alertness did not correlate with objective findings.