[Effects of endotracheal intubation on the trachea--usefulness of the evaluation by MRI].
Using an MRI apparatus, we observed the effects of endotracheal intubation on the trachea by measuring T1 value before and after an operation in ten surgical cases. T1 value of the anterior wall at the level of the first tracheal ring was 275.8 +/- 58 msec, and that of the posterior wall was 346.8 +/- 72 msec. The patients were all intubated under general anesthesia. Anesthesia was maintained with inhalation anesthesia such as nitrous oxide-oxygen-enflurane with the aid of vecuronium bromide. Periods of intubation varied between 80 to 46 minutes, and averaged 270 +/- 112 minutes. After the extubation, T1 value showed 312 +/- 62 msec at the anterior wall and 395 +/- 82 msec at the posterior wall. In the case of the posterior wall, T1 value was significantly prolonged compared with that of the pre-intubation period. Prolongation of T1 value is assumed to be related to the increase of tissue free water demonstrating the occurrence of tissue edema. From the findings that T1 value might be prolonged by endotracheal intubation, we conclude that the MRI apparatus is useful for investigating the effects of the intubation procedure on the trachea.
Dogomori
H
H
Department of Anesthesia, Fujimoto Hospital, Miyakonojo.
Fujimoto
T
T
Yoshimura
N
N
D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal / Q000009:adverse effects*; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D013514:Surgical Procedures, Operative; D014132:Trachea / Q000473:pathology*