Background: Non-invasive ventilation (NIV) is a well-established approach for preventing endotracheal intubation (ETI) in critically ill patients with acute respiratory failure (ARF). Sedation is frequently used to improve comfort. This study aimed to analyze the impact of sedation during NIV on ETI rates and NIV success in critically ill patients. Methods: We systematically searched in PubMed, EMBASE, MEDLINE, Web of Science, and CENTRAL up to September 2023, including prospective observational studies, retrospective cohort studies (nRCTs), and randomized controlled trials (RCTs). Primary outcomes were NIV success and ETI rates; secondary outcomes were hypotension, bradycardia, 28-day mortality, delirium, and oversedation. Proportions were used for observational studies, odds ratios (OR) for retrospective studies, and risk ratios (RR) for RCTs. Retrospective studies compared intermittent and continuous analgosedation, while RCTs evaluated dexmedetomidine versus other sedatives, including direct comparisons. Results: Four observational studies, 2 retrospective studies, and 7 RCTs (738 patients) were selected. Dexmedetomidine showed increased NIV success (RR = 1.167, 95%C.I. 1.014–1.343, p = 0.032) and reduced ETI rate (RR = 0.553, 95%C.I. 0.405–0.755, p < 0.001), but higher rate of bradycardia (RR = 2.172, 95%C.I. 1.819–4.042, p < 0.001) and hypotension (RR = 2.441, 95%C.I. 1.608–3.706, p < 0.001). nRCTs revealed higher NIV success (Proportion = 0.694, 95%C.I. 0.528–0.912, p = 0.009), moderate ETI rates (Proportion = 0.379, 95%C.I. 0.282–0.511, p < 0.001), and low bradycardia and hypotension rates. Conclusions: Our findings suggest that sedation, particularly dexmedetomidine-based strategies, may enhance NIV success and lower ETI rates. However, dexmedetomidine was also associated with higher rates of bradycardia and hypotension, especially compared with midazolam. To establish the correct sedation strategy, it is important to tailor the drug to the patient, considering its hemodynamic instability, delirium risk, and mortality risk.
Iacovazzo et al. (Sun,) studied this question.