Intubation Clinical Trial
Official title:
Thyromental Height Test as a New Method for Prediction of Difficult Intubation Using Videolaryngoscopy
The purpose of this study is to assess the usefulness of the Thyromental Height Test in prediction of difficult intubation using videolaryngoscopy and double lumen endotracheal tubes in patients scheduled for elective thoracic procedures.
Successful and fast intubation are crucial for the safety of general anaesthesia. Failed
intubation and acute hypoxia remain among the major contributing factors of anaesthesia
related deaths. Difficult intubation prevalence in literature is very inconsistent and varies
between 1.5-20% of cases in general population, to even 50% in obese Thai population.
There is a number of anthropometric scales and tests used for predicting difficult
intubation. However, none of them appears to be sensitive and specific enough to effectively
predict difficult intubation.
Recently, simple and non-invasive test predicting difficult intubation was
introduced-thyromental height test (TMHT). It shows promise as a more effective substitution
for frequently cited anthropometric measures. It is based on the height between the anterior
border of the thyroid cartilage and the anterior border of the mentum, measured while the
patient lies in the supine position with closed mouth The main objective of the trial is to
assess the clinical usefulness of TMHT in prediction of difficult intubation using
videolaryngoscopy and double lumen endotracheal tubes in patients scheduled for elective
thoracic surgical procedures. The secondary aim is to evaluate usefulness of other commonly
used predictive tests associated with difficult intubation.
During routine, preoperative anaesthetic visit thyromental height, thyromental distance,
sternomental distance and Mallampati scale score are assessed. Then, during videolaryngoscopy
and intubation, score in Cormack-Lehane scale and occurrence of difficult intubation are
noted.
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