The clinical utility of shock index in hospitalised patients requiring activation of the rapid response team

The systolic shock index (SSI) is used to direct management and predict outcomes, but its utility in patients requiring rapid response team (RRT) activation is unclear. We explored whether SSI can predict the outcomes of ward patients experiencing clinical deterioration and compared its performance with other parameters. This retrospective study included adult patients in medical/surgical wards who required RRT activation. We calculated SSI (heart rate/systolic blood pressure [BP]), diastolic shock index (DSI, heart rate/diastolic BP), modified shock index (heart rate/mean BP), and quick Sequential Organ Failure Assessment (qSOFA) score at activation. We categorised patients into two groups (SSI: ≥1.0 and