The term for the ratio of heart rate to systolic blood pressure is known as?

• A. Homeostatic Failure
• B. Shock Index
• C. Critical Perfusion
• D. Cellular Death

Answer: (B)

The metric combines heart rate and systolic blood pressure to gauge perfusion and hemodynamic stability. The ratio of heart rate to systolic blood pressure is known as the Shock Index. It’s calculated by dividing the heart rate (beats per minute) by the systolic blood pressure (mmHg). In healthy individuals, this value tends to be around 0.5–0.8, but in states of shock or poor perfusion the heart rate rises while systolic pressure falls, causing the index to increase. A higher Shock Index signals greater hemodynamic instability and helps clinicians quickly assess and triage patients who may need urgent resuscitation. The other terms listed aren’t standard names for this bedside measure, whereas Shock Index specifically captures this HR-to-SBP ratio.