Lung ultrasound associated to capnography to verify correct endotracheal tube positioning in prehospital.

Endotracheal intubation is the “gold standard” of the control of airway patency but is associated with nonnegligible morbidity rates. A rapid detection of esophageal intubation is essential. Capnography is considered the reference technique for correct endotracheal tube (ETT) positioning confirmation. However, capnography can provide false-positive and false-negative results in some situations. Recently, the ultrasound assessment has been studied for confirming ETT placement. Despite of few trials, the ultrasound procedure may enhance physician confidence and decision making in airway management. We report the case of a 52-year-old female patient presenting cardiorespiratory failure. During cardiopulmonary resuscitation, there was a sudden absence of end-tidal CO2 capnographic detection. Correct tube positioning could not be ascertained by auscultation because the environment had become extremely noisy. However, TM-mode (Time Motion--mode) lung ultrasound revealed bilateral pleural sliding during insufflation with the self-filling balloon, thus confirming correct ETT positioning.