Physiological Mechanisms of Upper Airway Hypotonia during REM Sleep

被引:78
作者
McSharry, David G. [1 ,2 ,3 ]
Saboisky, Julian P. [4 ,5 ]
DeYoung, Pam [1 ,2 ]
Jordan, Amy S. [6 ]
Trinder, John [6 ]
Smales, Erik [1 ,2 ]
Hess, Lauren [1 ,2 ]
Chamberlin, Nancy L. [7 ]
Malhotra, Atul [1 ,2 ,8 ]
机构
[1] Brigham & Womens Hosp, Sleep Disorders Res Lab, Boston, MA 02115 USA
[2] Harvard Univ, Sch Med, Boston, MA USA
[3] Letterkenny Gen Hosp, Donegal, Ireland
[4] Neurosci Res Australia, Sydney, NSW, Australia
[5] Univ New S Wales, Sydney, NSW, Australia
[6] Univ Melbourne, Sleep Lab, Parkville, Vic 3052, Australia
[7] Harvard Univ, Sch Med, Dept Neurol, Boston, MA 02115 USA
[8] Univ Calif San Diego, Div Pulm & Crit Care, San Diego, CA 92103 USA
关键词
Obstructive sleep apnea; rapid eye movement sleep; upper airway hypotonia; genioglossus; single motor unit; HUMAN GENIOGLOSSUS MUSCLE; APNEA SYNDROME; MOTOR UNITS; RISK-FACTOR; TONGUE; HYPERCAPNIA; MOVEMENT; PRESSURE; DISEASE; ADULTS;
D O I
10.5665/sleep.3498
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Study Objectives: Rapid eye movement (REM)-induced hypotonia of the major upper airway dilating muscle (genioglossus) potentially contributes to the worsening of obstructive sleep apnea that occurs during this stage. No prior human single motor unit (SMU) study of genioglossus has examined this possibility to our knowledge. We hypothesized that genioglossus SMUs would reduce their activity during stable breathing in both tonic and phasic REM compared to stage N2 sleep. Further, we hypothesized that hypopneas occurring in REM would be associated with coincident reductions in genioglossus SMU activity. Design: The activity of genioglossus SMUs was studied in (1) neighboring epochs of stage N2, and tonic and phasic REM; and (2) during hypopneas occurring in REM. Setting: Sleep laboratory. Participants: 29 subjects (38 +/- 13 y) (17 male). Intervention: Natural sleep, including REM sleep and REM hypopneas. Measurement and Results: Subjects slept overnight with genioglossus fine-wire intramuscular electrodes and full polysomnography. Forty-two SMUs firing during one or more of stage N2, tonic REM, or phasic REM were sorted. Twenty inspiratory phasic (IP), 17 inspiratory tonic (IT), and five expiratory tonic (ET) SMUs were characterized. Fewer units were active during phasic REM (23) compared to tonic REM (30) and stage N2 (33). During phasic REM sleep, genioglossus IP and IT SMUs discharged at slower rates and for shorter durations than during stage N2. For example, the SMU peak frequency during phasic REM 5.7 +/- 6.6 Hz (mean +/- standard deviation) was less than both tonic REM 12.3 +/- 9.7 Hz and stage N2 16.1 +/- 10.0 Hz (P < 0.001). The peak firing frequencies of IP/IT SMUs decreased from the last breath before to the first breath of a REM hypopnea (11.8 +/- 10.9 Hz versus 5.7 +/- 9.4 Hz; P = 0.001) Conclusion: Genioglossus single motor unit activity is significantly reduced in REM sleep, particularly phasic REM. Single motor unit activity decreases abruptly at the onset of REM hypopneas.
引用
收藏
页码:561 / 569
页数:9
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