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Respiratory function following application of MAST trousers
1Department of Surgery, University of Kansas School of Medicine, Kansas City.
JACEP
|August 1, 1978
Summary
Medical anti-shock trousers (MAST) may affect lung function but do not significantly impair alveolar ventilation in patients with severe hypotension. This study reviewed 25 patients receiving MAST support.
Area of Science:
- Emergency Medicine
- Critical Care Medicine
- Physiology
Background:
- Counterpressure suits, like medical anti-shock trousers (MAST), are used to manage severe hypotension.
- The impact of MAST on respiratory function, specifically functional ventilation, requires further investigation.
Purpose of the Study:
- To assess the effect of MAST on functional ventilation in patients requiring hemodynamic support.
- To evaluate the incidence and severity of acidosis in patients treated with MAST, particularly those with head injuries.
Main Methods:
- Retrospective review of 25 consecutive patients who received MAST support.
- Analysis of indications for MAST use, including systolic blood pressure thresholds.
- Assessment of acid-base status (pH levels) in patients, with a focus on those with head injuries.
Main Results:
- Patients with head injuries exhibited severe acidosis (mean pH 7.19) compared to other groups.
- While mechanical pulmonary function may be affected by counterpressure suits, alveolar ventilation was not significantly impaired.
- MAST was indicated for systolic pressure below 80 mm Hg or clinical signs with pressure below 100 mm Hg.
Conclusions:
- Counterpressure suits (MAST) do not appear to significantly impair alveolar ventilation despite potential effects on mechanical pulmonary function.
- Acidosis is a notable concern in MAST patients with head injuries, warranting close monitoring.
- Further research into the respiratory implications of MAST in critical care is recommended.