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Effects of nasal continuous positive airway pressure on left ventricular concentric hypertrophy in obstructive sleep apnea syndrome.
MedLine Citation:
PMID:  23064559     Owner:  NLM     Status:  In-Data-Review    
Objective Abnormal left ventricular (LV) geometry, especially concentric hypertrophy, is associated with cardiovascular morbidity and mortality. The aim of this study was to evaluate the impact of obstructive sleep apnea syndrome (OSAS) and the effects of nasal continuous positive airway pressure (CPAP) on the LV geometric patterns. Methods The LV morphological parameters, including the LV mass index (LVMI) and the relative wall thickness (RWT), were evaluated using echocardiography in 37 patients with OSAS diagnosed on polysomnography and 34 control subjects. Based on the values of LVMI and RWT, the LV geometry was classified as normal, concentric remodeling, concentric hypertrophy or eccentric hypertrophy. The echocardiographic parameters were reassessed after three months of CPAP treatment. Results Compared with the controls, the OSAS patients had a higher proportion of concentric hypertrophy patterns (54% vs. 0%, p<0.001) and a lower proportion of normal geometric patterns (5% vs. 62%, p<0.001). A univariate logistic regression analysis showed the apnea-hypopnea index, lowest oxygen saturation, hypoxemia index and body mass index to each be significantly associated with the presence of concentric hypertrophy. In a multivariate analysis of these factors, the apnea-hypopnea index was found to be a significant independent factor associated with the presence of concentric hypertrophy (odds ratio: 1.06, p=0.008). Three months of CPAP treatment resulted in significant decreases in LVMI and the proportion of cases with concentric hypertrophy (both p=0.025). Conclusion In our limited study population, OSAS patients were found to be associated with a high prevalence of concentric LV hypertrophy patterns that were able to be reversed with three months of CPAP treatment.
Seiji Koga; Satoshi Ikeda; Tomoo Nakata; Tomohiko Yasunaga; Koji Maemura
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Publication Detail:
Type:  Journal Article     Date:  2012-10-15
Journal Detail:
Title:  Internal medicine (Tokyo, Japan)     Volume:  51     ISSN:  1349-7235     ISO Abbreviation:  Intern. Med.     Publication Date:  2012  
Date Detail:
Created Date:  2012-10-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9204241     Medline TA:  Intern Med     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  2863-8     Citation Subset:  IM    
Department of Cardiovascular Medicine, Nagasaki University Graduate School of Biomedical Sciences, Japan.
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