Obesity Hypoventilation Syndrome Patients Research Articles

P027 Predictors of CPAP failure in severe obstructive sleep apnoea and obesity hypoventilation syndrome patients

Abstract There are mixed findings regarding predictors of failing continuous positive airway pressure in the obstructive sleep apnoea and obesity hypoventilation population, with duration of time under 90% oxygen saturation independently associated with treatment failure. Our study examined predictors of CPAP failure in severe OSA and OHS patients using baseline characteristics, diagnostic polysomnography, arterial blood gases and TcCO2 oximetry data. An observational review of patients in an accredited sleep laboratory from 2016 to 2021 was performed. Patients with treatment studies demonstrating CPAP failure were compared to patients controlled on CPAP therapy via pressure determination study. Independent t-test compared group characteristics and multivariate logistic regression was performed to assess predictors of CPAP failure. Data is presented as mean unless otherwise stated. Twenty patients who required bilevel support ventilation were compared to thirty-five patients controlled by CPAP. Total sleep time (266vs328minutes, p=0.007) and sleep efficiency (62% vs 75%, p=0.028) was lower in the BSV group. Patients who failed CPAP spent a greater percentage of T<88% on their diagnostic study (T<88%, 46.4%vs9.66%, p=0.001). Percentage of T<88% oxygen saturations were significant in being able to predict CPAP failure (p<0.001) using a model including arterial blood gas PaCO2 and TcCO2 data. TcCO2, blood gases and baseline demographic data were not significant in determining CPAP failure. Our study strengthens the duration of time spent hypoxic or T<88% as a significant predictor of CPAP failure. Surprisingly, TcCO2 data and paired arterial blood gas data was not able to predict who would require bilevel ventilation in our cohort.

Home mechanical ventilation: quality of life patterns after six months of treatment

BackgroundIt has been shown that home mechanical ventilation improves quality of life, but it has not been widely studied which particular patient groups benefit the most from starting this type of therapy. The purpose of this prospective observational study was to evaluate quality of life change patterns 6 months after initiation of home mechanical ventilation in patients suffering from chronic respiratory failure using patient reported outcomes.MethodsWe enrolled 74 chronic respiratory failure patients starting invasive or noninvasive home mechanical ventilation through the Semmelweis University Home Mechanical Ventilation Program. Quality of life was evaluated at baseline and at 6 months after initiation of home mechanical ventilation using the Severe Respiratory Insufficiency Questionnaire.ResultsOverall quality of life showed 10.5% improvement 6 months after initiation of home mechanical ventilation (p < 0.001). The greatest improvement was observed in Respiratory complaint (20.4%, p = 0.015), Sleep and attendant symptoms (19.3%, p < 0.001), and Anxiety related subscales (14.4%, p < 0.001). Interface (invasive versus noninvasive ventilation) was not associated with improvement in quality of life (p = 0.660). Severely impaired patients showed the greatest improvement (CC = -0.328, p < 0.001). Initial diagnosis contributed to the observed change (p = 0.025), with chronic obstructive pulmonary disease and obesity hypoventilation syndrome patients showing the greatest improvement, while amyotrophic lateral sclerosis patients showed no improvement in quality of life. We found that patients who were started on long term ventilation in an acute setting, required oxygen supplementation and had low baseline quality of life, showed the most improvement during the six-month study period.ConclusionsOur study highlights the profound effect of home mechanical ventilation on quality of life in chronic respiratory failure patients that is indifferent of ventilation interface but is dependent on initial diagnosis and some baseline characteristics, like acute initiation, oxygen supplementation need and baseline quality of life.Trial registrationThis study was approved by and registered at the ethics committee of Semmelweis University (SE TUKEB 251/2017; 20th of December, 2017).

非侵襲的陽圧換気療法(NPPV)が有効であった肺高血圧合併肥満低換気症候群の1例

非侵襲的陽圧換気療法(NPPV)が有効であった肺高血圧合併肥満低換気症候群の1例