These authors looked at 5958 trauma patients arriving at their trauma center with a systolic blood pressure greater than 90. They calculated shock index (heart rate /sbp) for all of these and then looked at who received a blood transfusion within one hour of arrival. 211 patients received blood in that time frame. “Patients were stratified by SI using the following thresholds: ? 0.7, > 0.7 to 0.9, > 0.9 to 1.1, > 1.1 to 1.3, and > 1.3.”
“A main effect was observed for shock index with increased risk for required transfusion for patients with admission shock index >0.7 (P < 0.001). In comparison to shock index of ? 0.7, odds ratios were 2.5(1.7 - 3.8), 8.2(5.4 - 12.2), 24.9(15.1 - 41.1), 59.0(32.0 - 108.6) for each categorical increase in SI.”
References
Lin TM, Memon AM, Reeson EA, Tolan GC, Low TM, Kupanoff KM, Huang DD, Jones MD, Czarkowski BR, Soe-Lin H, Bogert JN, Weinberg JA. Shock index identifies compensated shock in the 'Normotensive' trauma patient. Injury. 2025 May 8:112419. doi: 10.1016/j.injury.2025.112419. Epub ahead of print. PMID: 40379507.
