This before-and-after study evaluated real-time bag-valve-mask ventilation feedback during adult out-of-hospital cardiac arrest, analyzing 4,300 ventilations in 163 patients. Insufflated volume was within 400–600 mL in 68% of ventilations with feedback versus 42% without, whereas expiratory tidal volume met that range in 14% versus 15%. Median expiratory tidal volume was 235 versus 243 mL with and without feedback, respectively (p=0.84). Feedback was associated with less variable insufflated volumes (within-patient IQR ratio 0.65; 95% CI 0.53–0.77) and lower leak volume (adjusted mean ratio 0.88; 95% CI 0.77–0.99).
Feedback was associated with better control of insufflated volume, but this did not translate into a demonstrated improvement in expiratory tidal volume. Patient-centred benefits remain unestablished.
Study limitation: Sequential observational cohorts limit causal inference; the abstract reports ventilation measures rather than survival or neurological outcomes.
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