The first sign of failure was a black flag on a white horizon. Robert Falcon Scott had reached the South Pole, but the outcome that ultimately defined his expedition lay not at the Pole, but on the long journey home. Clinical trials face a similar question: should an intervention be judged by the nearest outcome it can influence, or by whether the patient survives the entire journey?

The Long Journey Home explores why mortality is both the most compelling and the most demanding endpoint in critical care research—objective, patient-important and capable of revealing unexpected harm, yet often causally distant, statistically inefficient and blind to the quality of survival. From testing an expedition to testing a pair of boots, it asks how far along the causal path an intervention can reasonably be expected to reach. The blog leads into our latest collection: Critical Care Trials Reporting a Mortality Effect. Reaching the Pole is not the same as coming home.

Mortality is the outcome that matters most—but a statistically significant result is not always a settled answer. This collection brings together the pivotal acute and critical care trials that reported a mortality benefit or harm. It distinguishes primary outcomes from secondary analyses, subgroup findings and restricted analyses. It also follows the important stories that came afterwards. Where a promising mortality effect was not reproduced in a later large multicentre trial, the studies are shown side by side.

Where apparent harm was subsequently not confirmed, that evidence is presented with the same scrutiny. Across 187 trial entries, the collection makes the evolution of critical care evidence visible. It is a practical resource for understanding not simply whether mortality changed, but how confidently we should believe it. Explore the trials that changed practice, challenged assumptions and refined the evidence.