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The effects of the GABA agonist, baclofen, on sleep and breathing

AJ Finnimore, M Roebuck, D Sajkov, RD McEvoy
European Respiratory Journal 1995 8: 230-234; DOI: 10.1183/09031936.95.08020230
AJ Finnimore
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M Roebuck
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D Sajkov
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RD McEvoy
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Abstract

The gamma aminobutyric acid (GABA)-B agonist, baclofen, is a centrally-acting, anti-spasmodic agent and muscle relaxant used in spinal cord lesions, multiple sclerosis and other neurological disorders. In a previous pilot study of quadriplegic patients, 75% of whom were treated with baclofen, we found a high prevalence of sleep-disordered breathing. Because of the depressant effects of GABA on the central nervous system, we hypothesized that baclofen might aggravate sleep-disordered breathing in susceptible individuals by depressing central ventilatory drive, increasing upper airway obstruction and/or increasing the arousal threshold to apnoea. We therefore conducted a double-blind, placebo-controlled, cross-over study of baclofen 25 mg, administered before sleep in 10 snorers with mild sleep-disordered breathing (respiratory disturbance index < 30 events per sleep hour). Each subject underwent two standard polysomnographic assessments, one week apart. Total sleep time was significantly prolonged by baclofen (placebo 356 +/- 9.9 SEM min; baclofen 386 +/- 9.9 min). Both nonrapid eye movement(REM) and REM sleep duration were increased (nonREM: placebo 295 +/- 6.8 min; baclofen 311 +/- 8.9 min; REM: placebo 61 +/- 7.5 min; baclofen 76 +/- 9.0 min). Time spent awake after sleep onset was reduced after baclofen (placebo 71 +/- 10.3 min; baclofen 51 +/- 9.7 min). There was a slight reduction in mean overnight oxygen saturation (placebo 95.2 +/- 0.5%; baclofen 94.4 +/- 0.7%). The frequency of apnoeas plus hypopnoeas (respiratory disturbance index (RDI)) did not change significantly (placebo 9 +/- 1.8 events.h-1; baclofen 13 +/- 3.4 events.h-1).(ABSTRACT TRUNCATED AT 250 WORDS)

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The effects of the GABA agonist, baclofen, on sleep and breathing
AJ Finnimore, M Roebuck, D Sajkov, RD McEvoy
European Respiratory Journal Feb 1995, 8 (2) 230-234; DOI: 10.1183/09031936.95.08020230

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The effects of the GABA agonist, baclofen, on sleep and breathing
AJ Finnimore, M Roebuck, D Sajkov, RD McEvoy
European Respiratory Journal Feb 1995, 8 (2) 230-234; DOI: 10.1183/09031936.95.08020230
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