Abstract:Objective To analyze the effect of different ventilation parameter settings of non-invasive ventilators during the day and night in the treatment of patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD) complicated with obstructive sleep apnea (OSA), and its influence on sleep efficiency, Borg score, and AHI.Methods A total of 174 patients with AECOPD combined with OSA admitted to Hebei Provincial Chest Hospital from March 2022 to February 2025 were selected and divided into three groups according to the random number table method, with 58 cases in each group. During the day, all three groups of patients were treated with the optimal positive airway pressure (PAP) parameters for AECOPD patients, while at night, different methods of non-invasive positive airway pressure ventilation PAP treatment parameters were adopted. Group A maintained a constant nocturnal inspiratory pressure (IPAP), while the expiratory pressure (EPAP) remained unchanged if there was no snoring during sleep. Otherwise, the EPAP was titrated to the lowest parameter level that could eliminate snoring during sleep. In Group B, IPAP and EPAP were respectively increased by 3 cmH2O at night based on the daytime parameters. In group C, IPAP remained unchanged at night and EPAP was increased by 3 cmH2O based on the daytime parameters. The therapeutic effects of the three groups were compared.Results After treatment, the levels of TST/TRT, AHI and MAI in Group C and group B were all lower than those in group A (P < 0.05), while the level of miniSpO2 was higher than that in group A (P < 0.05). The increases in TST/TRT from before to after treatment in Groups B and C were smaller than that in Group A (P < 0.05). In contrast, the reductions in AHI and MAI, as well as the increase in miniSpO2, from before to after treatment in Groups B and C were all greater than those in Group A (P < 0.05). After treatment, the ESS score, Borg score and mMRC score of Group C and Group B were lower than those of group A (P < 0.05). The differences in ESS, Borg, and mMRC scores before and after treatment in Groups B and C were greater than those in Group A (P < 0.05). After treatment, the PaCO2 levels in Group C and Group B were lower than those in group A (P < 0.05), while the PaO2 levels were higher than those in Group A (P < 0.05). The reductions in PaCO2 and pH from before to after treatment in Groups B and C were greater than those in Group A (P < 0.05). Similarly, the increase in PaO2 was greater in Groups B and C than in Group A (P < 0.05). After treatment, the CAT scores of Group C and Group B were lower than those of group A (P < 0.05), while the HRQL scores were higher than those of Group A (P < 0.05). The increase in HRQL scores from before to after treatment in Groups B and C was greater than that in Group A (P < 0.05). Conversely, the reduction in CAT scores was greater in Groups B and C than in Group A (P < 0.05).Conclusion When patients with OSA combined with AECOPD are treated with NPPV, the IPAP remains unchanged at night, and the EPAP is increased by 3 cmH2O based on the daytime parameters. This can improve the PSG parameters and blood gas analysis indicators, relieve the patients' dyspnea symptoms and fatigue state, and reduce their daytime sleepiness.