Objective To assess the risk factors associated with extubation failure in patients who had successfully passed a spontaneous breathing trial.Methods Patients receiving invasive mechanical ventilation for over 48 h were enrolled in the study，they were admitted into Emergency ICU of Zhongshan Hospital during May 2006 and Oct.2007.A spontaneous breathing trial was conducted by a pressure support of 7 cm H2O for 30 min.Clinical data were prospectively recorded for the patient receiving full ventilatory support before and after the spontaneous breathing trial.Regarding the extubation outcome，patients were divived into extubation success group and extubation failure group.Results A total of 58 patients with a mean（±SD） age of 69.4±12.7 years passed spontaneous breathing trial and were extubated.Extubation failure occurred in 11 patients（19%）.The univariate analysis indicated the following associations with extubation failure：elderly patients（78.1±7.9 years vs 67.4±15.1years，Plt;0.05），higher rapid shallow breathing index（RSBI） value（83±12 breaths·min-1·L-1 vs 68±19 breaths·min-1·L-1，Plt;0.05）and excessive respiratory tract secretions（54.5％ vs 21.3％，Plt;0.05）.Conclusion Among routinely measured clinical variables，elderly patients，higher RSBI value and amount of respiratory tract secretions were the valuable index for predicting extubation failure despite a successful spontaneous breathing trial.
ObjectiveTo investigate the clinical efficacy of AIRVO2 respiratory humidification apparatus in patients with tracheotomy after successful weaning from mechanical ventilation in intensive care unit (ICU).MethodsOne hundred subjects were randomly divided into a control group (treated with the tracheotomy mask joint oxygen inhalation by heating humidifier, n=50) and an observation group (treated with AIRVO2 model, n=50) on the basis of conventional therapy. Blood gas indexes (pH, PaO2, PaCO2, PaO2/FiO2) and clinical data (heart rate, respiratory rate, SpO2, sputum viscosity) were recorded at 0 h, 6 h, 12 h, 24 h, 48 h, 72 h after weaning. Besides, the incidence of postoperative pulmonary infection, rapid shallow breathing index (RSBI), successful weaning rate from mechanical ventilation and daily cost of weaning between the two groups were compared at 72 h after weaning.ResultsAfter treatment, all observed data of the patients were obviously improved compared with those before treatment. The differences of humidification effects between the observation group and the control group at the same time point were statistically significant (P<0.05). The differences of heart rate, respiratory rate, and SpO2 between the observation group and the control group at the same time point were statistically significant (P<0.05). The improvement of PaO2 and PaCO2 at the same time point were statistically different between the observation group and the control group (P<0.05). Seventy-two hours after weaning, the incidence of postoperative pulmonary infection and RSBI in the observation group were significantly lower than those in the control group (P<0.05), successful weaning rate from mechanical ventilation in the observation group was significantly higher than that in the control group (P<0.05), and the average daily cost of weaning from mechanical ventilation in the observation group was lower than that in the control group (P<0.05). Nine patients in the control group and 1 patient in the observation group needed secondary mechanical ventilation due to hypoxemia.ConclusionThe therapy of AIRVO2 respiratory humidification apparatus combined with conventional treatment may achieve satisfactory effect for patients of successful weaning from mechanical ventilation with tracheotomy, and it is worthy of promotion in clinical use.