Low iCa is associated with prehospital hypotension regardless of age, ISS, or sampling time and is a better predictor of mortality than base deficit. Since acidosis reduces calcium binding to serum protein and actually increases iCa, the association between base deficit and iCa in this study requires further investigation.
TTA criteria selected patients with greater ISS and early mortality, but impact on long-term survival may not be appreciated. Full TTA criteria for blunt injury may be limited to GCS <8, SBP <90, RR >29 or <10, and intubation status.
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