Author: Ball, Lorenzo; Serpa Neto, Ary; Trifiletti, Valeria; Mandelli, Maura; Firpo, Iacopo; Robba, Chiara; Gama de Abreu, Marcelo; Schultz, Marcus J.; Patroniti, Nicolò; Rocco, Patricia R. M.; Pelosi, Paolo
Title: Effects of higher PEEP and recruitment manoeuvres on mortality in patients with ARDS: a systematic review, meta-analysis, meta-regression and trial sequential analysis of randomized controlled trials Cord-id: sw5wxdfp Document date: 2020_12_18
ID: sw5wxdfp
Snippet: PURPOSE: In patients with acute respiratory distress syndrome (ARDS), lung recruitment could be maximised with the use of recruitment manoeuvres (RM) or applying a positive end-expiratory pressure (PEEP) higher than what is necessary to maintain minimal adequate oxygenation. We aimed to determine whether ventilation strategies using higher PEEP and/or RMs could decrease mortality in patients with ARDS. METHODS: We searched MEDLINE, EMBASE and CENTRAL from 1996 to December 2019, included randomiz
Document: PURPOSE: In patients with acute respiratory distress syndrome (ARDS), lung recruitment could be maximised with the use of recruitment manoeuvres (RM) or applying a positive end-expiratory pressure (PEEP) higher than what is necessary to maintain minimal adequate oxygenation. We aimed to determine whether ventilation strategies using higher PEEP and/or RMs could decrease mortality in patients with ARDS. METHODS: We searched MEDLINE, EMBASE and CENTRAL from 1996 to December 2019, included randomized controlled trials comparing ventilation with higher PEEP and/or RMs to strategies with lower PEEP and no RMs in patients with ARDS. We computed pooled estimates with a DerSimonian-Laird mixed-effects model, assessing mortality and incidence of barotrauma, population characteristics, physiologic variables and ventilator settings. We performed a trial sequential analysis (TSA) and a meta-regression. RESULTS: Excluding two studies that used tidal volume (V(T)) reduction as co-intervention, we included 3870 patients from 10 trials using higher PEEP alone (n = 3), combined with RMs (n = 6) or RMs alone (n = 1). We did not observe differences in mortality (relative risk, RR 0.96, 95% confidence interval, CI [0.84–1.09], p = 0.50) nor in incidence of barotrauma (RR 1.22, 95% CI [0.93–1.61], p = 0.16). In the meta-regression, the PEEP difference between intervention and control group at day 1 and the use of RMs were not associated with increased risk of barotrauma. The TSA reached the required information size for mortality (n = 2928), and the z-line surpassed the futility boundary. CONCLUSIONS: At low V(T), the routine use of higher PEEP and/or RMs did not reduce mortality in unselected patients with ARDS. TRIAL REGISTRATION: PROSPERO CRD42017082035.
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