Septic shock, lung imaging,and driving pressure —what the evidence says now.

This systematic review searched MEDLINE, Embase, and the Cochrane Central Register from inception to August 13, 2025. It included both observational studies and RCTs that evaluated prognostic factors for early mortality (in-hospital or up to 31 days) in adult patients with septic shock.

Adjusted odds ratios were pooled via generic inverse variance with a random-effects model — a methodologically rigorous approach that limits confounding compared to unadjusted analyses. The paper is complemented by a companion benchmarking study from the same journal, creating a two-part roadmap for understanding who dies from septic shock.

The authors performed a Bayesian network diagnostic meta-analysis — a methodological step above standard pairwise meta-analysis because it allows simultaneous comparison of multiple tests against a common reference (CT scan). The search was conducted through May 15, 2025.

The primary analysis assessed sensitivity and specificity of lung ultrasound (LUS) and chest X-ray (CXR) against CT-confirmed pneumonia in mechanically ventilated and critically ill ICU patients. The Bayesian framework produced posterior probability distributions for diagnostic accuracy rather than single-point estimates, which is more honest about uncertainty.

This meta-analysis restricted its population to randomized controlled trials, the highest-quality design for intervention comparisons, which limits confounding inherent in observational driving-pressure data. Four RCTs (n = 465) met inclusion criteria — a small but concentrated evidence base.

The primary outcome was 28- or 30-day all-cause mortality. Secondary outcomes included ICU length of stay, ventilator-free days, and barotrauma rates. The review addresses the critical question of whether titrating ventilation to limit driving pressure (ΔP < 14 cmH₂O) is superior to conventional low tidal volume + plateau pressure targeting.