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Auto-trilevel versus bilevel positive airway pressure ventilation for hypercapnic overlap syndrome patients

  • Sleep Breathing Physiology and Disorders • Original Article
  • Published:
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Abstract

Purpose

Although bilevel positive airway pressure (Bilevel PAP) therapy is usually used for overlap syndrome (OS), there is still a portion of OS patients in whom Bilevel PAP therapy could not simultaneously eliminate residual apnea events and hypercapnia. The current study was expected to explore whether auto-trilevel positive airway pressure (auto-trilevel PAP) therapy with auto-adjusting end expiratory positive airway pressure (EEPAP) can serve as a better alternative for these patients.

Methods

From January of 2014 to June of 2016, 32 hypercapnic OS patients with stable chronic obstructive pulmonary diseases (COPD) and moderate-to-severe obstructive sleep apnea syndrome (OSAS) were recruited. Three variable modes of positive airway pressure (PAP) from the ventilator (Prisma25ST, Weinmann Inc., Germany) were applicated for 8 h per night. We performed the design of each mode at each night with an interval of two nights with no PAP treatment as a washout period among different modes. In Bilevel-1 mode (Bilevel-1), the expiratory positive airway pressure (EPAP) delivered from Bilevel PAP was always set as the lowest PAP for abolishment of snoring. For each patient, the inspiratory positive airway pressure (IPAP) was constantly set the same as the minimal pressure for keeping end-tidal CO2 (ETCO2) ≤45 mmHg for all three modes. However, the EPAP issued by Bilevel PAP in Bilevel-2 mode (Bilevel-2) was kept 3 cmH2O higher than that in Bilevel-1. In auto-trilevel mode (auto-trilevel) with auto-trilevel PAP, the initial part of EPAP was fixed at the same PAP as that in Bilevel-1 while the EEPAP was automatically regulated to rise at a range of ≤4 cmH2O based on nasal airflow wave changes. Comparisons were made for parameters before and during or following treatment as well as among different PAP therapy modes. The following parameters were compared such as nocturnal apnea hypopnea index (AHI), minimal SpO2 (minSpO2), arousal index, sleep structure and efficiency, morning PaCO2, and daytime Epworth Sleepiness Scale (ESS).

Results

Compared with the parameters before PAP therapies, during each mode of PAP treatment, significant reduction was detected in nocturnal AHI, arousal index, morning PaCO2, and daytime ESS while significant elevation was revealed in nocturnal minSpO2 and sleep efficiency (all P < 0.01). Comparison among three PAP modes indicated that under the same IPAP, the auto-trilevel PAP mode could result in the lowest arousal index, daytime ESS, and the highest sleep efficiency. Compared with Bilevel-1, it was detected that (a) AHI was lower but minSpO2 was higher in both Bilevel-2 and auto-trilevel (all P < 0.05) and (b) morning PaCO2 showed no statistical difference from that in auto-trilevel but displayed higher in Bilevel-2 (P < 0.05). Compared with Bilevel-2, in auto-trilevel, both AHI and minSpO2 showed no obvious changes (all P > 0.05) except with a lower morning PaCO2 (P < 0.05).

Conclusion

Auto-trilevel PAP therapy was superior over conventional Bilevel PAP therapy for hypercapnic OS patients with their OSAS moderate to severe, since auto-trilevel PAP was more efficacious in synchronous elimination of residual obstructive apnea events and CO2 retention as well as in obtaining a better sleep quality and milder daytime drowsiness.

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Author information

Author notes

  1. De Huai and Juan Cao contributed equally to the first author Mei Su.

Authors and Affiliations

  1. Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital with Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, China

    Mei Su, Ding Ning, Rong Xue, Meijie Xu, Mao Huang & Xilong Zhang

  2. Department of Otorhinolaryngology, Huaian Hospital and Huai’an Second People’s Hospital, Xuzhou Medical University, Huaian, Jiangsu, 223002, China

    De Huai

  3. Department of Respirology, Wuxi People’s Hospital, 299 Qingyang Road, Wuxi, Jiangsu, 214001, China

    Juan Cao

Authors
  1. Mei Su
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  2. De Huai
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  3. Juan Cao
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  4. Ding Ning
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  5. Rong Xue
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  6. Meijie Xu
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  7. Mao Huang
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  8. Xilong Zhang
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Corresponding author

Correspondence to Xilong Zhang.

Ethics declarations

All procedures performed in this study involving human participants were in accordance with the ethical standards of Patient Ethics and Research Committee of the First Affiliated Hospital of Nanjing Medical University and with the 1964 Helsinki declaration and its later amendments. Informed consent was obtained from all individual participants included in the study.

Conflict of interest

The authors declare that they have no conflict of interest.

Funding

The 333 high level personnel training program in Jiangsu Province (BRA-2014131) provided financial support in the form of ventilator application training, and the key research and development program of Huai’an (social development HAS201611) provided financial support in the form of necessary equipment for this study. The sponsors had no role in the design or conduct of this research.

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Su, M., Huai, D., Cao, J. et al. Auto-trilevel versus bilevel positive airway pressure ventilation for hypercapnic overlap syndrome patients. Sleep Breath 22, 65–70 (2018). https://doi.org/10.1007/s11325-017-1529-y

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  • DOI: https://doi.org/10.1007/s11325-017-1529-y

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