Ultrasound in<unk>  and Hypotension
External
Internal
Thoracic cavity
Peritoneal cavity
Retroperitoneal space (i.e. pelvic fracture)
Femur fracture (into muscle/subcutaneous tissue)
Thoracic cavity
Peritoneal cavity
Retroperitoneal space (i.e. pelvic fracture)
Femur fracture (into muscle/subcutaneous tissue)
Hemorrhagic shock
Cardiogenic
Spinal shock
Acute valvular Regurgitation/VSD
Neurogenic shock
CHF
Undifferentiated shock 
Dysrhythmia