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Poster Presentations: Wednesday, November 3, 2010 |

High Prevalence of Sleep-Disordered Breathing in Chinese Patients With Difficult-to-Control Hypertension FREE TO VIEW

Macy M. Lui, MBBS; David C. Lam, PhD; Carmen W. Chan, MBBS; Jamie C. Lam, MD; Agnes Y. Lai, RPSGT; Stephen W. Li, MBBS; Mary S. Ip, MD
Author and Funding Information

The University of Hong Kong, Queen Mary Hospital, Hong Kong, Hong Kong PRC



Chest. 2010;138(4_MeetingAbstracts):613A. doi:10.1378/chest.10780
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Abstract

PURPOSE: To evaluate the prevalence of sleep disordered breathing (SDB)in Chinese subjects with difficult-to-control hypertension.

METHODS: Medical records of patients attending the hypertension clinic at a University teaching hospital were screened over one year. Inclusion criteria were age 18 - 65 with hypertension requiring ≥ 3 anti-hypertensive medications. Patients with known secondary causes of hypertension, unstable medical illnesses in the past three months, on drugs other than anti-hypertensives that might influence blood pressure, were excluded. Eligible subjects were invited to undergo 24-hour ambulatory blood pressure measurement and polysomnography(PSG).

RESULTS: 116 subjects were interviewed and 92 consented for PSG. 6 defaulted the PSG appointment. 10 were awaiting their PSG. Among the 76 subjects already completed PSG, the mean age was 52.2 ± 8.4, male:female=1.5:1, mean body mass index 29.6 ± 5.3 kg/m2, mean systolic blood pressure 141.9 ± 17.3mmHg, mean diastolic blood pressure 81.9 ± 10.9mmHg. Sleep disordered breathing (Apnea hypopnea index ≥ 5/hour) was diagnosed in 57 subjects (57/76=75%)(mean age 52.4 ± 9.0, male:female=2.4:1, mean BMI 30.6 ± 4.9 kg/m2). 41 (41/76=53.9%) had moderate or severe SDB (AHI ≥ 15/hour). Among those with SDB, Obstructive apnea was the predominant type of SDB seen. Central apneas predominance was observed in two subjects (2/57=3.5%).

CONCLUSION: Sleep disordered breathing, in particular obstructive sleep apnea, was found to be highly prevalent in Chinese with difficult-to-control hypertension.

CLINICAL IMPLICATIONS: The finding should arouse higher awareness of the common co-existence of sleep disordered breathing in patients with difficult-to-control hypertension.

DISCLOSURE: Macy Lui, No Financial Disclosure Information; No Product/Research Disclosure Information

12:45 PM - 2:00 PM


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