shock index
Ratio of heart rate to systolic blood pressure used to assess hemodynamic status and predict outcomes in trauma patients.
Full Definition
The shock index is calculated by dividing the heart rate by the systolic blood pressure, providing a simple bedside tool for evaluating hemodynamic compromise in trauma patients. Normal values range from 0.5 to 0.7, while values exceeding 1.0 suggest significant hemodynamic instability and increased mortality risk. The shock index is particularly useful in identifying occult shock in patients who may maintain normal blood pressure through compensatory mechanisms. It serves as both a diagnostic tool and prognostic indicator in trauma resuscitation protocols.
Usage
Usage note: May be abbreviated as SI in clinical documentation; always express as a decimal ratio
In Context
- "The patient's shock index of 1.2 indicated significant hemodynamic compromise despite stable blood pressure." — Emergency department triage assessment
- "Serial shock index measurements showed improving hemodynamic status following resuscitation." — Trauma bay documentation