Ultrasound in Undifferentiated Hypotension

Background

* Symptomatic undifferentiated hypotension represents a negative prognostic factor and the strongest predictor of in-hospital mortality. * Misdiagnosis may lead to delayed or incorrect treatment of some life-threatening conditions.

Aim

- The aim of the study is to evaluate the feasibility and accuracy of a new bedside ultrasound method that consists in the focused imaging of the thorax, abdomen and leg veins, in emergency.

Methods

* Hypotensive (<100 mm/Hg) patients presenting to our emergency department, complaining of at least one of the neurologic, respiratory and cutaneous signs and symptoms of inadequate tissue perfusion, are prospectively studied by ultrasound-focused assessment of the heart, lungs, inferior vena cava, peritoneum, aorta and leg deep veins. * On the basis of physical examination and ultrasound results, the operator declares the diagnostic hypothesis without influencing the attending physician and the following diagnostic procedure (which includes ultrasound, when needed). * The diagnostic hypothesis is compared with the final diagnosis, obtained after the hospital route and discussed by a panel of three blinded experts (one radiologist, one cardiologist and one emergency physician). * The statistical agreement is calculated by the k of Cohen with p-value, confidence intervals and raw agreement (Ra).