Re: Small versus large bore chest tube in traumatic hemothorax, hemopneumothorax, and pneumothorax—external validity, endpoint heterogeneity, and trial sequential analysis assumptions

BACKGROUND: Granieri and colleagues compared small-caliber chest drains (14 Ch or smaller) with large-bore chest tubes (28 Ch or larger) for traumatic hemothorax, hemopneumothorax, and pneumothorax and combined conventional meta-analysis with trial sequential analysis. MAIN POINTS: While the pooled effect estimate suggested no clear difference in treatment failure, clinical translation requires caution. First, the randomized trials largely represent selected, stable thoracic trauma rather than high-risk phenotypes (for example, massive hemothorax, ventilated patients, or severe polytrauma). Second, the primary endpoint ("failure") groups reinterventions that vary in clinical impact and are sensitive to local imaging and escalation thresholds (for example, second drain versus video-assisted surgery). Third, trial sequential analysis conclusions depend strongly on prespecified assumptions (baseline event rate and the smallest clinically important effect), which should be explicitly justified and, where possible, explored in sensitivity analyses. CONCLUSION: These clarifications may reduce overgeneralization, better align conclusions with the included trial populations, and inform pragmatic multicenter trial design with standardized protocols and patient-centered outcomes.