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Does tachycardia correlate with hypotension after trauma?
Gregory P Victorino1, Felix D Battistella, David H Wisner
1Department of Surgery, University of California, San Francisco-East Bay, Oakland, California 94602, USA.
Journal of the American College of Surgeons
|May 14, 2003
Summary
Tachycardia is not a reliable indicator of hypotension in trauma patients. While associated with increased mortality, its poor sensitivity and specificity limit its use in initial evaluations.
Area of Science:
- Trauma care
- Emergency medicine
- Physiological monitoring
Background:
- Tachycardia is commonly associated with hypotension in hemorrhagic shock diagnosis.
- The direct correlation between heart rate and hypotension in trauma remains unproven.
Purpose of the Study:
- To investigate the reliability of tachycardia as an early indicator of hypotension in trauma patients.
- To assess the diagnostic accuracy of heart rate for predicting hypotension.
Main Methods:
- Retrospective analysis of trauma patients aged 16-49.
- Exclusion of moribund patients and those with severe head/spinal injuries.
- Defined tachycardia as heart rate ≥90 bpm and hypotension as systolic blood pressure <90 mmHg.
Main Results:
- 35% of hypotensive patients were not tachycardic.
- Tachycardia was present in 39% of patients with normal blood pressure.
- Hypotensive patients with tachycardia had significantly higher mortality (15% vs 2%).
Conclusions:
- Tachycardia is an unreliable sign of hypotension in trauma.
- Heart rate's low sensitivity and specificity limit its predictive value.
- Absence of tachycardia does not rule out significant blood loss; co-occurring hypotension and tachycardia indicate higher mortality.