Diaphragmatic dysfunction is associated with sepsis severity and pejorative prognosis. Aim of this study is to assess diaphragmatic function with the Diaphragmatic Thickening Fraction (DTF) ultrasound measure in patients with severe sepsis or septic shock, mechanically ventilated or not, hospitalized in ICU in order to determinate diaphragmatic dysfunction frequency, its prognosis value and its associated factors. This is a prospective pilot study in a 14-bed medical and surgical ICU including 50 consecutive patients with severe sepsis or septic shock. The expected duration of study is 18 months. DTF is measured each day as follow: the probe is placed in an intercostal space between mid axillary line and anterior axillary line, 0.5cm to 2 centimeters below the costodiaphragmatic sinus. DTF measure is performed in B-mode using the following formula: TF (%) = \[(end-inspiration thickness - end-expiration thickness)/(end-expiration thickness) x 100\]. A DTF \< 20% indicates a diaphragmatic dysfunction. The investigators will collect potential factors for which DTF Ultrasound Measure could have a prognosis value (intubation, successful or failed weaning from mechanical ventilation), potential risk factors (age, sex, tobacco, alcohol etc.) and potentials associated factors. The investigators expect measure of DTF allows identifying patient with severe sepsis or septic shock with diaphragmatic dysfunction. It would also estimate diaphragmatic dysfunction frequency with ultrasound measure and warranting its use routinely at the bedside. The investigators expect that DTF helps to characterize degree of severity of septic patient and can be a new index able to predict intubation in this population.
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Diaphragmatic Dysfunction with DTF Ultrasound measure
Timeframe: Participants will be followed for the duration of ICU stay, an expected average of 10 days