Could Elevated C-Reactive Protein in Patients With Obstructive Sleep Apnea Be Due to Obesity per se?
2003; Lippincott Williams & Wilkins; Volume: 107; Issue: 1 Linguagem: Inglês
10.1161/01.cir.0000046771.12875.6c
ISSN1524-4539
Autores Tópico(s)Body Contouring and Surgery
ResumoHomeCirculationVol. 107, No. 1Could Elevated C-Reactive Protein in Patients With Obstructive Sleep Apnea Be Due to Obesity per se? Free AccessLetterPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessLetterPDF/EPUBCould Elevated C-Reactive Protein in Patients With Obstructive Sleep Apnea Be Due to Obesity per se? Tsung O. Cheng Tsung O. ChengTsung O. Cheng The George Washington University, Washington, DC Originally published7 Jan 2003https://doi.org/10.1161/01.CIR.0000046771.12875.6CCirculation. 2003;107:e9To the Editor:I read with interest the recent report by Shamsuzzaman et al1 of elevated C-reactive protein (CRP) in patients with obstructive sleep apnea (OSA). Although the patients and control subjects were matched for body mass index (BMI), 36±4 kg/m2 versus 34±4 kg/m2, all were very obese (upper normal BMI=25 kg/m2).Several recent studies have indicated that CRP levels are elevated in obese patients.2–4 Adiposity, in particular visceral adipose tissue, is a key promoter of low-grade chronic inflammation.3 The central distribution of body fat as evaluated by waist circumference is a stronger predictor of CRP levels than total adiposity as evaluated by BMI.4Thus, it would be of interest to know the differences in the fat distribution between the Mayo Clinic patients with OSA and the control subjects. Shinohara et al5 reported a relatively higher waist circumference and a greater amount of abdominal visceral fat accumulation in obese patients with OSA. Therefore, one should not compare apples with oranges; perhaps, I should say, one should not compare apples (android obesity) with pears (gynecoid obesity).1 Shamsuzzaman ASM, Winnicki M, Lanfranchi P, et al. Elevated C- reactive protein in patients with obstructive sleep apnea. Circulation. 2002; 105: 2462–2464.LinkGoogle Scholar2 Visser M, Bouter LM, McQuillan GM, et al. Elevated C-reactive protein levels in overweight and obese adults. JAMA. 1999; 282: 2131–2135.CrossrefMedlineGoogle Scholar3 Forouhi NG, Sattar N, McKeigue PM. Relation of C-reactive protein to body fat distribution and features of the metabolic syndrome in Europeans and South Asians. Int J Obes Relat Metab Disord. 2001; 25: 1327–1331.CrossrefMedlineGoogle Scholar4 Pannacciulli N, Cantatore FP, Minenna A, et al. C-reactive protein is independently associated with total body fat, central fat, and insulin resistance in adult women. Int J Obes Relat Metab Disord. 2001; 25: 1416–1420.CrossrefMedlineGoogle Scholar5 Shinohara E, Kihara S, Yamashita S, et al. Visceral fat accumulation as an important risk factor for obstructive sleep apnea syndrome in obese subjects. J Intern Med. 1997; 241: 11–18.CrossrefMedlineGoogle ScholarcirculationahaCirculationCirculationCirculation0009-73221524-4539Lippincott Williams & WilkinsResponseShamsuzzaman A.S.M., , Winnicki Mikolaj, , Lanfranchi Paola, , Kara Tomas, , Wolk Robert, , Accurso Valentina, , and Somers Virend K., 07012003We appreciate Dr Cheng's interest in our work.1 There is emerging evidence of a number of variables that may influence C-reactive protein (CRP) levels, including, as Dr Cheng points out, obesity, visceral adiposity, and sex.2–4 Patients with increased abdominal visceral fat may indeed have a higher prevalence of obstructive sleep apnea (OSA).5 It is important to consider whether higher levels of CRP in subjects with visceral obesity may be a consequence of the visceral obesity or the sleep apnea. We believe that both conditions may conceivably be implicated. Prior studies linking visceral obesity to CRP levels have not excluded the effects of the presence of OSA.In our study, patients with OSA had body mass indexes (BMIs) and percent body fat similar to controls. Although waist-to-hip ratio was higher in patients with OSA than controls (0.998 versus 0.905, P=0.0002), multivariate analysis showed that the association between elevated CRP and OSA remained statistically significant after adjustment for age, sex, BMI, and waist-to-hip ratios (F=8.07, P=0.008). By contrast, after adjusting for age, sex, BMI, and apnea hypopnea index, there was no significant association between waist-to-hip ratio and CRP (F=3.1, P=0.09). These findings speak to the broader concept of including the possible confounding effects of occult sleep apnea in studies addressing the pathophysiological mechanisms linking obesity and fat distribution to cardiovascular disease. eLetters(0)eLetters should relate to an article recently published in the journal and are not a forum for providing unpublished data. Comments are reviewed for appropriate use of tone and language. Comments are not peer-reviewed. Acceptable comments are posted to the journal website only. Comments are not published in an issue and are not indexed in PubMed. Comments should be no longer than 500 words and will only be posted online. References are limited to 10. 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Gami A, Caples S and Somers V (2003) Obesity and obstructive sleep apnea, Endocrinology and Metabolism Clinics of North America, 10.1016/S0889-8529(03)00069-0, 32:4, (869-894), Online publication date: 1-Dec-2003. January 7, 2003Vol 107, Issue 1 Advertisement Article InformationMetrics https://doi.org/10.1161/01.CIR.0000046771.12875.6CPMID: 12515763 Originally publishedJanuary 7, 2003 PDF download Advertisement
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