Pneumatic antishock trousers (military antishock trousers, MAST) have achieved progressively greater utilization in prehospital and hospital care since their introduction in 1903. The major physiologic response to external counterpressure is a blood pressure rise, probably resulting from an increase in peripheral vascular resistance (afterload) produced by vessel compression in areas covered by the garment. Respiratory limitation is minimal and is similar to that observed with assumption of the supine position alone. One indication for use of the antishock trousers is hypotension due to hypovolemia or volume maldistribution. Recent data suggest that use of the MAST suit with external cardiac massage improves the efficacy of cardiopulmonary resuscitation. Contraindications to use of the device are active congestive heart failure and documented cardiogenic shock. Care must always be taken not to deflate the trousers too rapidly.
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