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Pneumatic Anti-Shock Garment
Temple College
EMS Professions
Pneumatic Anti-Shock Garment
PASG
Medical
Anti-Shock Trousers
Military Anti-Shock Trousers
MAST
Action
Applies circumferential
pneumatic counterpressure to
abdomen, lower extremities
Therapeutic Effects
Controls
external bleeding by
direct compression
Controls internal bleeding under
trousers by:
–reduction of blood flow
–compression of vessels
Therapeutic Effects
Stabilizes
–Pelvis
–Femurs
fractures
Therapeutic Effects
 Increases
resistance to blood flow in
lower body
 Shunts blood to:
– Heart
– Lungs
– Brain
 Produces
increased blood flow to
critical organs
Indications
 BP
below 80 systolic due to hypovolemia
 Extensive soft tissue trauma to or
bleeding from abdomen or lower
extremities with hypovolemic shock
 Pelvic/femur fractures with hypovolemic
shock
Absolute Contraindications
Pulmonary Edema
Diaphragmatic Hernia
Relative Contraindications
 Bleeding
above level of suit
 Head trauma
 Thoracic trauma
 Advanced pregnancy (legs only)
 Abdominal evisceration/impaled object
(legs only)
 Short transport times (<30 minutes)
Removal
 At
hospital under supervision of
physician who understands device
 IVs established
 Surgical team ready
 Abdomen then one leg at a time SLOWLY
Removal
 Deflation
should take 20 - 60 minutes
 If BP drops 4-6 mmHg, discontinue
deflation, infuse fluid
 If BP drops over 10mmHg, re-inflate
 Unstable patient may need to go to OR
with MAST in place
Never deflate entire suit at once