Background: The aspiration test, performed by a self-inflating bulb (SIB), is a simple and reliable method to detect an accidental esophageal intubation. The aim of the study, in case of employment of a hollow intubating introducer (HII), was to verify the possibility to directly perform the test with the introducer and its efficacy in allowing the detection of its position.
Experimental Design: prospective, randomized study.
Environment: operating theater in a university hospital.
Patients: adult patients, without evidence of gastro-esophageal or tracheobronchial pathologies, scheduled for elective surgery.
Interventions: patients were randomized in two groups T (HII was placed in trachea) and E (HII was positioned in the esophagus). Under general anesthesia, a HII was placed in either the trachea or the esophagus. A blinded anesthesiologist connected the SIB to the HII and performed the test twice.
Measurements: the anesthesiologist inferred the position of the device, based on the re-inflation observed.
Results: One hundred subjects were studied. In group E patients, a prompt and complete re-inflation of the bulb was never observed and the anesthesiologist correctly inferred the position of the HII. Occasionally (3.5% of cases), in group T patients, a prevented or incomplete re-inflation of the bulb occurred, leading to an incorrect judgment of the HII position.
Conclusions: The aspiration test with the SIB allows the proper detection of the introducer in esophagus. When used in combination with a HII, both time and local trauma associated with an erroneous, introducer-guided esophageal intubation in case of difficult laryngoscopy may be reduced.
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