Obstructive sleep apnea (OSA) can induce dramatic nocturnal blood pressure fluctuations (NBPFs) and can be associated with nocturnal hypertension and arterial stiffness. We investigated the effect of short- and long-term continuous positive airway pressure (CPAP) therapy on NBPFs, nocturnal blood pressure (BP), and arterial stiffness in patients with coexisting cardiovascular diseases (CVD) and OSA (CVD/OSA).
Of 86 patients with CVD, 58 also had OSA, while 28 without OSA served as controls. Nighttime BP was measured continuously using pulse transit time (PTT) and arterial stiffness was measured with pulse wave velocity (PWV). A NBPF was defined as systolic BP elevation > 12 mmHg in a 30 s interval of sleep. All measurements were conducted at baseline, after the first night of CPAP, and after 6 months of CPAP therapy.
In CVD/OSA patients, we observed significantly more frequent NBPFs (p < 0.001) compared with controls. CPAP therapy decreased the frequency of NBPFs (p < 0.001), the maximum systolic BP by 9 mmHg (p = 0.021), and PWV (p < 0.001) even after the first night. After long-term CPAP therapy, there was an additional decrease in average nocturnal systolic BP by 10 mmHg (p = 0.039).
Our findings demonstrate that CPAP therapy reduces NBPFs, nocturnal BP, and arterial stiffness in CVD/OSA patients. This effect was demonstrable after the first night of CPAP and grew more robust after 6 months of CPAP therapy.
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We thank Xenia Monreal, Claudia Stelzmann, and Erika Altenhofen who provided help during the research, and we thank the patients who supported this study. We also thank Mataroria Lyndon for proofreading.
Conflict of interest
The authors declare that they have no conflict of interest.
The study protocol was approved by the ethics committee of the Medical Association of Witten/Herdecke (Germany). All procedures were performed in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendment.
Written informed consent was obtained from each participant included in the study.
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Picard, F., Panagiotidou, P., Weinig, L. et al. Effect of CPAP therapy on nocturnal blood pressure fluctuations, nocturnal blood pressure, and arterial stiffness in patients with coexisting cardiovascular diseases and obstructive sleep apnea. Sleep Breath 25, 151–161 (2021). https://doi.org/10.1007/s11325-020-02075-4
- Obstructive sleep apnea
- Continuous positive airway pressure
- Nocturnal blood pressure
- Nocturnal blood pressure fluctuations
- Arterial stiffness
- Cardiovascular disease