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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Obstructive Sleep Apnea is Associated with Increased Chemoreflex Sensitivity in Patients with Metabolic Syndrome

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Author(s):
Trombetta, Ivani C. [1] ; Maki-Nunes, Cristiane ; Toschi-Dias, Edgar ; Alves, Maria-Janieire N. N. ; Rondon, Maria Urbana P. B. [2] ; Cepeda, Felipe X. ; Drager, Luciano F. ; Braga, Ana Maria F. W. ; Lorenzi-Filho, Geraldo ; Negrao, Carlos E. [2]
Total Authors: 10
Affiliation:
[1] Univ Sao Paulo, Heart Inst InCor, Sch Med, Unidade Reabilitacao Cardiovasc & Fisiol Exercici, BR-05403000 Sao Paulo - Brazil
[2] Univ Sao Paulo, Sch Phys Educ & Sports, BR-05403000 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Sleep; v. 36, n. 1, p. 41-49, JAN 1 2013.
Web of Science Citations: 28
Abstract

Study Objectives: Obstructive sleep apnea (OSA) is often observed in patients with metabolic syndrome (MetS). In addition, the association of MetS and OSA substantially increases sympathetic nerve activity. However, the mechanisms involved in sympathetic hyperactivation in patients with MetS + OSA remain to be clarified. We tested the hypothesis that chemoreflex sensitivity is heightened in patients with MetS and OSA. Design: Prospective clinical study. Participants: Forty-six patients in whom MetS was newly diagnosed (ATP-III) were allocated into: (1) MetS + OSA (n = 24, 48 +/- 1.8 yr); and (2) MetS -OSA (n = 22, 44 +/- 1.7 yr). Eleven normal control subjects were also studied (C, 47 +/- 2.3 yr). Measurements: OSA was defined as an apnea-hypopnea index >= 15 events/hr (polysomnography). Muscle sympathetic nerve activity (MSNA) was measured by microneurography technique. Peripheral chemoreflex sensitivity was assessed by inhalation of 10% oxygen and 90% nitrogen (carbon dioxide titrated), and central chemoreflex sensitivity by 7% carbon dioxide and 93% oxygen. Results: Physical characteristics and MetS measures were similar between MetS + OSA and MetS - OSA. MSNA was higher in MetS + OSA patients compared with MetS - OSA and C (33 +/- 1.3 versus 28 +/- 1.2 and 18 +/- 2.2 bursts/min, P < 0.05). Isocapnic hypoxia caused a greater increase in MSNA in MetS + OSA than MetS -OSA and C (P = 0.03). MSNA in response to hyperoxic hypercapnia was greater in MetS + OSA compared with C (P = 0.005). Further analysis showed a significant association between baseline MSNA and peripheral (P < 0.01) and central (P < 0.01) chemoreflex sensitivity. Min ventilation in response to hyperoxic hypercapnia was greater in MetS + OSA compared with C (P = 0.001). Conclusion: OSA increases sympathetic peripheral and central chemoreflex response in patients with MetS, which seems to explain, at least in part, the increase in sympathetic nerve activity in these patients. In addition, OSA increases ventilatory central chemoreflex response in patients with MetS. (AU)

FAPESP's process: 11/17533-6 - Autonomic, metabolic and inflammatory aspects of metabolic syndrome associated with obstructive sleep apnea: effect of hypocaloric diet and physical training
Grantee:Ivani Credidio Trombetta
Support Opportunities: Regular Research Grants