Document Detail

Sleep-disordered breathing with nighttime hypocapnia relates to daytime enhanced ventilatory response to exercise in patients with heart disease.
MedLine Citation:
PMID:  23291838     Owner:  NLM     Status:  In-Data-Review    
Background: Sleep-disordered breathing (SDB) induces nighttime disturbance of arterial gases, such as carbon dioxide. However, it is still unclear whether nighttime SDB-related gas abnormality is related to respiratory dysregulation in daytime. Therefore, we examined the relationship between the arterial partial pressure of carbon dioxide (PaCO(2)) at nighttime and the respiratory response to exercise in daytime. Methods: Eighteen men (age, mean ± SD; 55 ± 11 years) with heart disease underwent multichannel respiratory monitoring through the night with transdermal measurement of PaCO(2) (PtcCO(2)) reflecting PaCO(2) and a cardiopulmonary exercise test in daytime. The ventilatory equivalent (VE)/carbon dioxide production (VCO(2)) slope as an index of ventilatory response to exercise and peak oxygen consumption (VO(2)) were obtained with a cardiopulmonary exercise test. Results: Of the 18 patients, 10 patients had obstructive SDB, 5 had central SDB, and 3 patients did not have SDB. The mean apnea-hypopnea index was 21 ± 17. Minimum nighttime saturation of O(2) was positively correlated with peak VO(2), but not with VE/VCO(2). Nighttime PtcCO(2) was not correlated with peak VO(2) but was negatively correlated with the VE/VCO(2) slope of the daytime cardiopulmonary exercise test (r=-0.53). Conclusion: Nighttime lowering of PaCO(2) in SDB is related to an abnormal ventilatory response to exercise testing in the daytime. This finding suggests that nighttime hyperventilation in SDB alters both nighttime and daytime pathophysiological conditions in patients with heart disease.
Nagaharu Fukuma; Hiroko Hayashi; Juri Sugaya; Tomohiro Aida; Masatoshi Kato; Kazuyo Kato; Yuko Kato; Hiroshi Takahashi; Kyoichi Mizuno
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of Nippon Medical School = Nippon Ika Daigaku zasshi     Volume:  79     ISSN:  1347-3409     ISO Abbreviation:  J Nippon Med Sch     Publication Date:  2012  
Date Detail:
Created Date:  2013-01-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100935589     Medline TA:  J Nippon Med Sch     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  409-15     Citation Subset:  IM    
Division of Cardiology, Department of Internal Medicine, Nippon Medical School.
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