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Redefining hypotension in the elderly: normotension is not reassuring
Tolulope A Oyetunji1, David C Chang, Joseph G Crompton
1Howard-Hopkins Surgical Outcomes Research Center, Department of Surgery, Howard University College of Medicine, Washington, DC 20060, USA. toyetunji@howard.edu
Archives of Surgery (Chicago, Ill. : 1960)
|July 20, 2011
Summary
The optimal definition of hypotension varies by age. For trauma patients under 65, a systolic blood pressure (SBP) below 90 mm Hg is ideal, while elderly patients require a higher SBP threshold.
Area of Science:
- Trauma care
- Critical care medicine
- Emergency medicine
Background:
- The definition of hypotension, particularly the systolic blood pressure (SBP) threshold, is debated.
- Existing definitions may not be universally applicable across all patient demographics.
Purpose of the Study:
- To determine the optimal SBP threshold for defining hypotension in trauma patients across different age groups.
- To identify age-specific definitions of hypotension to improve patient outcomes.
Main Methods:
- Analysis of a large dataset (902,852 patients) from the National Trauma Data Bank.
- Stratification of patients into three age groups: 18-35, 36-64, and 65+ years.
- Logistic regression and AUROC curve analysis to identify SBP cutoffs that best predict in-hospital mortality.
Main Results:
- Optimal SBP thresholds for hypotension varied significantly by age.
- Recommended SBP cutoffs were 85 mm Hg (18-35 years), 96 mm Hg (36-64 years), and 117 mm Hg (65+ years).
- Overall mortality in the study cohort was 4.1%.
Conclusions:
- The traditional hypotension definition (SBP < 90 mm Hg) remains optimal for trauma patients under 65.
- A higher SBP threshold is necessary for defining hypotension in elderly trauma patients due to their unique physiological characteristics.
- Revising hypotension definitions for the elderly is crucial given their increasing representation in trauma cases.
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