Impact of obstructive sleep apnea on left atrial functional and structural remodeling beyond obesity.

Abstract:

BACKGROUND:To evaluate the left atrial (LA) volume and function of obese patients with/without obstructive sleep apnea (OSA) and its association with left ventricular (LV) diastolic function independent of obesity. METHODS:LA volumetric and functional parameters were measured by 2-dimensional and strain echocardiography in 49 obese (body mass index ≥ 25 kg/m(2)) subjects (24 non-OSA and 25 OSA). RESULTS:OSA group showed larger maximal LA volume indexed for body surface area, larger volume before atrial contraction, a reduction in the LA passive emptying fraction, and an increase in the LA active emptying fraction with no significant change in LA total emptying fraction. Mitral annular early diastolic velocity (Ea) was significantly reduced, whereas the ratio of mitral valve early diastolic velocity (E) to Ea (E/Ea) and late diastolic velocity (Aa) were significantly increased in OSA group. Although the mean peak late diastolic strain rate had not shown any differences, the LA mean peak systolic strain/strain rate, and mean peak early diastolic strain rate were significantly lower in the OSA group. Apnea-hypopnea index (AHI) of the OSA patients was significantly correlated with E/Ea (r=0.67, p<0.001). There is a significant correlation between LA active emptying volume index and E/Ea (r=0.77, p<0.001), and between LA passive emptying volume index and E/Ea (r=-0.51, p=0.009). CONCLUSION:LA structural and functional remodeling was significantly correlated with the severity of OSA and LV diastolic filling pressure. OSA impaired LA wall compliance and passive contraction independent of obesity.

journal_name

J Cardiol

journal_title

Journal of cardiology

authors

Kim SM,Cho KI,Kwon JH,Lee HG,Kim TI

doi

10.1016/j.jjcc.2012.07.007

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

475-83

issue

6

eissn

0914-5087

issn

1876-4738

pii

S0914-5087(12)00133-5

journal_volume

60

pub_type

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