This retrospective cohort study examined the dynamic changes in platelet counts—the platelet trajectory—around the initiation of Continuous Renal Replacement Therapy (CRRT) in over 2,200 critically ill adults with Acute Kidney Injury (AKI) to determine their association with in-hospital mortality.

Researchers categorized patients into nine distinct patterns by analyzing platelet slopes (descending, stable, or ascending) seven days before and seven days after CRRT began.

With a high overall in-hospital mortality rate of 57.8%, the study aimed to identify easily observable prognostic signals.

The analysis conclusively found that a descending platelet trajectory after CRRT initiation was a strong, independent predictor of higher in-hospital mortality.

Specifically, all three patterns that included a ‘descending’ slope during-CRRT were significantly associated with increased odds of death (e.g., Stable-Descending pattern had an adjusted odds ratio of $1.49$). Conversely, patients with stable or ascending platelet counts post-CRRT tended to have lower mortality.

This finding highlights the crucial prognostic value of monitoring the dynamic trend of a routinely measured parameter, suggesting that a continued drop in platelets after starting CRRT signals ongoing, severe physiological deterioration and a worse outcome.

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