Ultrasonographic abdominal aorta diameter changes: A predictor of hypovolemic shock class 1

Hypovolemic shock class 1 and mild to moderate dehydration are associated with normal or minimal changes in vital signs. Biochemical values markedly change only in advanced hypovolemia. Inspiration and expiration inferior vena cava diameter changes predict hypovolemic shock class 1 but in acute emergencies this method is impractical. The purpose of this study is to develop a new approach in identifying hypovolemic shock at early phase (class 1 hypovolemic shock) by measuring the diameter of aorta using ultrasound machine.