Relation of sleep-disordered breathing to carotid plaque and intima-media thickness

Keattiyoat Wattanakit, Lori Boland, Naresh M Punjabi, Eyal Shahar

Research output: Contribution to journalArticle

Abstract

Background: Sleep-disordered breathing (SDB) is associated with clinical cardiovascular disease (CVD), but its relation to subclinical atherosclerosis remains to be determined. Methods: We analyzed the cross-sectional associations of SDB, measured by the respiratory disturbance index (RDI), a hypoxemia index, and an arousal index, with carotid plaque and carotid intima-media thickness (IMT), measured by ultrasound. The sample included 985 participants in the Sleep Heart Health Study (mean age-62, median RDI-8.7) with no history of coronary heart disease and stroke, of whom 396 had evidence of a carotid plaque. Results: As compared with the first quartile of the RDI (0-1.2), the crude odds ratio for carotid plaque was 1.14, 1.27, and 1.48 for the second (1.3-4.1), third (4.2-10.7), and fourth (>10.7) quartile, respectively. After adjustment for CVD risk factors, the corresponding odds ratios were reduced (1.00, 1.04, 1.07, and 1.25). Similarly, the unadjusted mean carotid IMT increased with RDI, but adjusted means (mm) were similar (0.84, 0.85, 0.84, 0.85). Spline regression models did not show monotonicity of the dose-response functions at the right end of the RDI distribution. Neither the hypoxemia index nor the arousal index was associated with carotid plaque or carotid IMT. Conclusion: The results of this study suggest that crude, positive associations between SDB and subclinical atherosclerosis can be attributed to confounding by CVD risk factors.

Original languageEnglish (US)
Pages (from-to)125-131
Number of pages7
JournalAtherosclerosis
Volume197
Issue number1
DOIs
StatePublished - Mar 2008

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Carotid Intima-Media Thickness
Sleep Apnea Syndromes
Cardiovascular Diseases
Arousal
Atherosclerosis
Odds Ratio
Coronary Disease
Sleep
Stroke
Health
Hypoxia

Keywords

  • Cardiovascular risk factor
  • Carotid intima-media thickness
  • Carotid plaque
  • Epidemiology
  • Sleep-disordered breathing

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Cite this

Relation of sleep-disordered breathing to carotid plaque and intima-media thickness. / Wattanakit, Keattiyoat; Boland, Lori; Punjabi, Naresh M; Shahar, Eyal.

In: Atherosclerosis, Vol. 197, No. 1, 03.2008, p. 125-131.

Research output: Contribution to journalArticle

Wattanakit, Keattiyoat ; Boland, Lori ; Punjabi, Naresh M ; Shahar, Eyal. / Relation of sleep-disordered breathing to carotid plaque and intima-media thickness. In: Atherosclerosis. 2008 ; Vol. 197, No. 1. pp. 125-131.
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AB - Background: Sleep-disordered breathing (SDB) is associated with clinical cardiovascular disease (CVD), but its relation to subclinical atherosclerosis remains to be determined. Methods: We analyzed the cross-sectional associations of SDB, measured by the respiratory disturbance index (RDI), a hypoxemia index, and an arousal index, with carotid plaque and carotid intima-media thickness (IMT), measured by ultrasound. The sample included 985 participants in the Sleep Heart Health Study (mean age-62, median RDI-8.7) with no history of coronary heart disease and stroke, of whom 396 had evidence of a carotid plaque. Results: As compared with the first quartile of the RDI (0-1.2), the crude odds ratio for carotid plaque was 1.14, 1.27, and 1.48 for the second (1.3-4.1), third (4.2-10.7), and fourth (>10.7) quartile, respectively. After adjustment for CVD risk factors, the corresponding odds ratios were reduced (1.00, 1.04, 1.07, and 1.25). Similarly, the unadjusted mean carotid IMT increased with RDI, but adjusted means (mm) were similar (0.84, 0.85, 0.84, 0.85). Spline regression models did not show monotonicity of the dose-response functions at the right end of the RDI distribution. Neither the hypoxemia index nor the arousal index was associated with carotid plaque or carotid IMT. Conclusion: The results of this study suggest that crude, positive associations between SDB and subclinical atherosclerosis can be attributed to confounding by CVD risk factors.

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