Clinical trial NCT02988336: TMHT - New Method of Difficult Intubation Prediction
Official title: Thyromental Height Test as a New Method for Prediction of Difficult Intubation With Double Lumen Tube
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Airway Management
Predictive Value of Tests
Keywords: difficult intubation
thyromental height
Lead sponsor: Medical University of Silesia
Sponsor class: OTHER
First posted: 2016-12-09
Enrollment: 237
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Consecutive patients undergoing elective thoracic procedures in university hospital, requiring general anaesthesia, elective direct laryngoscopy and intubation with a double lumen endotracheal tubes.

Brief summary: The purpose of this study is to assess the usefulness of the Thyromental Height Test in prediction of difficult intubation using double lumen endotracheal tubes in patients scheduled for elective thoracic procedures.

Detailed description: Proper prediction of the occurrence of difficult intubation plays a crucial role in anaesthesiology. For years attempts have been made to develop methods allowing anaesthesiologists to correctly predict the occurrence of difficult intubation. None of the currently used tests and anthropometric measurements present satisfying predictive value. Recent studies show promise in Thyromental Height Test (TMHT), which base on the height between the anterior borders of the mentum and the thyroid cartilage, measured while the patient lies in the supine position with closed mouth, as a single, non-invasive predictor of difficult intubation. Use of double lumen endotracheal tubes during thoracic procedures, due to greater diameter of the tube, may lead to higher occurrence of difficult intubation. That is why, the purpose of this study is to assess the usefulness of the TMHT in prediction of difficult intubation using double lumen endotracheal tubes in patients scheduled for elective thoracic procedures and relate it to other, commonly used predictive tests.

During routine, preoperative anaesthetic visit thyromental height, thyromental distance, sternomental distance and Mallampati scale score are assessed. Then, during direct laryngoscopy and intubation, score in Cormack-Lehane scale and occurrence of difficult intubation are noted.

Eligibility criteria: Inclusion Criteria:

* patients scheduled for elective thoracic procedures, requiring general anaesthesia, direct laryngoscopy and intubation with a Robertshaw type double lumen endotracheal tubes
* consent for participation in the trail
* older than 18

Exclusion Criteria:

* emergency procedures
* visible anatomic abnormalities
* patients scheduled for awake fibre optic intubation
* lack of consent for participation in the trail

Primary outcomes:
measure: Thyromental height
timeFrame: immediate
Secondary outcomes:
measure: Thyromental distance
timeFrame: immediate
measure: Sternomental distance
timeFrame: immediate
measure: score in modified Mallampati test
timeFrame: immediate
measure: score in Cormack-Lehane scale
timeFrame: immediate
Other outcomes:
Locations:
city: Zabrze
country: Poland
facility: Samodzielny Publiczny Szpital Kliniczny nr 1
state: Silesia
Study officials:
affiliation: School of Medicine with the Division of Dentistry in Zabrze. Medical University of Silesia. Department of Anaesthesiology and Critical Care.
name: Hanna Misiołek, MD PhD
role: STUDY_CHAIR
References:
citation: Palczynski P, Bialka S, Misiolek H, Copik M, Smelik A, Szarpak L, Ruetzler K. Thyromental height test as a new method for prediction of difficult intubation with double lumen tube. PLoS One. 2018 Sep 13;13(9):e0201944. doi: 10.1371/journal.pone.0201944. eCollection 2018.