[Application value of non-invasive ventilation combined with high flow nasal cannula oxygen therapy in sequential treatment of patients with chronic obstructive pulmonary disease after mechanical ventilation].

Objective: To investigate the value of non-invasive ventilation (NIV) combined with high flow nasal cannula oxygen therapy (HFNCO) in sequential treatment of patients with chronic obstructive pulmonary disease after mechanical ventilation. Methods: Chronic obstructive pulmonary disease with acute exacerbation (AECOPD) patients with invasive mechanical ventilation (MV) and successful withdrawal admitted into Huxi Affiliated Hospital of Jining Medical College from January 2018 to December 2019 were enrolled for perspective study. The patients were divided into treatment group ( n= 40) and control group ( n= 33) by random number table method. The treatment group was given NIV and HFNCO, the control group was given NIV treatment alone. Bedside ultrasound was used to measure the patients' diaphragmatic motion, and the differences between the two groups of patients before treatment, 24, 48 and 72 h after treatment were compared in diaphragmatic excursions during quiet breathing (DEq), diaphragmatic excursions during deep breathing(DEd), diaphragmatic shallow fast breathing index (D-RSBI), arterial oxygen partial pressure (PaO(2)), arterial partial pressure of carbon dioxide (PaCO(2)), re-tracheal intubation rate, mortality rate for 28 days and average duration of NPPV treatment within 3 days. Results: There were no statistically significant differences in DEq, DEd, D-RSBI, PaO(2) and PaCO(2) between the two groups before treatment (all P> 0.05). After 24 h treatment, DEd decreased in both groups, D-RSBI increased in both groups, However, D-RSBI [(1.33±0.56) vs (1.62±0.59) times·min(-1)·mm(-1)] in the treatment group was significantly lower than the control group, P= 0.034. After 72 h treatment, DEd [(41.4±8.1) vs (37.8±6.0) mm] was significantly higher than the control group, D-RSBI [(1.02±0.27) vs (1.22±0.43) times·min(-1)·mm(-1)] was significantly lower than the control group (all P< 0.05). The average duration of NIV treatment time [(7.5±1.2) vs (9.3±2.6) h] in the treatment group was significantly shorter than that in the control group ( P< 0.01). There were no statistically significant differences in PaO(2), PCO(2), re-tracheal intubation rate and the mortality rate of 28 days. Conclusion: NIV combined with HFNCO sequential therapy can effectively relieve diaphragm fatigue and promote recovery of respiratory muscle strength, and it's better than NIV alone.