Redefining Spontaneous Breathing Trial in COPD Exacerbation with Acute Hypercapnic Respiratory Failure: The Role of High Pressure Support and Non-Invasive Ventilation Post-Extubation

INTRODUCTION: The process of weaning from invasive mechanical ventilation (IMV) usually takes up more than 40% of the time on IMV(1), especially so in patients with multiple risk factors for failed extubation procedures(2). The current practice of spontaneous breathing trials (SBT) includes either reducing the pressure support to 5–7 cm of H2O over a peep of 1–5 cm of H2O while still connected to ventilator or detached to an independent source of oxygen via T-piece(3). Moreover, non-invasive ventilation has been recommended in patients with risk factors for post extubation respiratory failure(4). OBJECTIVES: To evaluate the role of higher PS during SBT in COPD exacerbation patients and its impact on extubation success, reintubation rates, and ICU outcomes. This study also aims to emphasize the potential for NIV post-extubation in facilitating recovery and preventing complications. MATERIALS AND METHODS: A retrospective analysis was conducted over six months, including 30 COPD exacerbation patients intubated due to acute hypercapnic respiratory failure (excluding cases with community-acquired pneumonia). SBT success and extubation outcomes were assessed in two groups: those requiring higher PS (≥8cm H(2)O) and those requiring PS <8 cm H(2)O. Data were analyzed for reintubation rates, ICU length of stay, diaphragmatic function (measured by mean excursion), and nutritional status (NUTRIC score). RESULTS: Out of 30 patients, 22 (73%) were extubated on higher PS (≥8 cm H(2)O) and transitioned to NIV. Reintubation rates were lower in this group (9%) compared to patients extubated on lower PS (<8 cm H(2)O, reintubation rate: 12.5%; p=0.62). The duration of IMV was similar between groups (3.5 vs. 3.25 days), but ICU stay was shorter in the higher PS group (9 vs. 12 days). Patients requiring higher PS had reduced diaphragmatic excursions (<1.6 cm) and poorer NUTRIC scores (3.09 vs. 3.5). DISCUSSIONS/CONCLUSIONS: Higher PS during SBT facilitates safe extubation in COPD patients when immediately transitioned to NIV, potentially reducing ICU stay and supporting respiratory muscle recovery. Modern NIV modalities, such as IVAPS and AVAPS, can optimize post-extubation care by ensuring adequate alveolar ventilation. This study underscores the need to revise SBT criteria for COPD patients and advocates for personalized strategies tailored to disease-specific challenges. Further multicentric trials are warranted to validate these findings.