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Published in: Sleep and Breathing 4/2020

01-12-2020 | Sleep Apnea | Sleep Breathing Physiology and Disorders • Original Article

Overlap syndrome: the coexistence of OSA further impairs cardiorespiratory fitness in COPD

Authors: Luiz Carlos Soares de Carvalho Junior, Renata Trimer, Katiany Lopes Zangrando, Guilherme Peixoto Tinoco Arêas, Flávia Rossi Caruso, José Carlos Bonjorno Junior, Cláudio Ricardo Oliveira, Renata Mendes, Audrey Borghi-Silva

Published in: Sleep and Breathing | Issue 4/2020

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Abstract

Background

Cardiorespiratory fitness (CRF) is an important prognostic marker in chronic obstructive pulmonary disease (COPD). Obstructive sleep apnea (OSA) also negatively affects exercise tolerance. However, the impact of their association on CRF has not been evaluated. We hypothesized that patients with overlap syndrome would demonstrate a greater impairment in CRF, particularly those with severe COPD.

Methods

Individuals with COPD were recruited. First, subjects underwent clinical and spirometry evaluation. Next, home-based sleep evaluation was performed. Subjects with an apnea-hypopnea index (AHI) < 15 episodes/h were allocated to the COPD group and those with an AHI ≥ 15 episodes/h to the overlap group. On the second visit, subjects underwent a cardiopulmonary exercise test. Subsequently, they were divided into four groups according to the severity of COPD and coexistence of OSA: COPDI/II; overlap I/II; COPDIII/IV; and overlap III/IV.

Results

: Of the 268 subjects screened, 31 were included. The overlap group exhibited higher values for peak carbon dioxide (COPD: 830 [678–1157]; overlap: 1127 [938–1305] mm Hg; p < 0.05), minute ventilation (COPD: 31 [27–45]; overlap: 48 [37–55] L; p < 0.05), and peak systolic blood pressure (COPD: 180 [169–191]; overlap: 220 [203–227] mm Hg; p <; 0.001) and peak diastolic blood pressure COPD: 100 [93–103]; overlap: 110 [96–106] mm Hg; p < 0.001). COPD severity associated with OSA produced a negative impact on exercise time (COPDIII/IV: 487 ± 102; overlap III/IV: 421 ± 94 s), peak oxygen uptake (COPDIII/IV: 12 ± 2; overlap III/IV: 9 ± 1 ml.Kg.min−1 ; p < 0.05) and circulatory power (COPDIII/IV: 2306 ± 439; overlap III/IV: 2162 ±  340 ml/kg/min.mmHg; p < 0.05).

Conclusion

Overlap syndrome causes greater hemodynamic and ventilatory demand at the peak of dynamic exercise. In addition, OSA overlap in individuals with more severe COPD impairs CRF.
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Metadata
Title
Overlap syndrome: the coexistence of OSA further impairs cardiorespiratory fitness in COPD
Authors
Luiz Carlos Soares de Carvalho Junior
Renata Trimer
Katiany Lopes Zangrando
Guilherme Peixoto Tinoco Arêas
Flávia Rossi Caruso
José Carlos Bonjorno Junior
Cláudio Ricardo Oliveira
Renata Mendes
Audrey Borghi-Silva
Publication date
01-12-2020
Publisher
Springer International Publishing
Published in
Sleep and Breathing / Issue 4/2020
Print ISSN: 1520-9512
Electronic ISSN: 1522-1709
DOI
https://doi.org/10.1007/s11325-019-02002-2

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