The purpose of this study is to assess the usefulness of the Thyromental Height Test in prediction of difficult intubation and the utility of double lumen video endotracheal tubes in patients scheduled for elective thoracic procedures.
Most of the thoracic surgery interventions require lung isolation techniques. Currently the most commonly used lung isolation techniques are double lumen tubes or single lumen tubes with additional use of bronchial blockers. In both cases fiberoptic bronchoscopy is used for proper placement and maintenance during operation. Recently double lumen video endotracheal tubes were proposed as a new alternative for lung isolation techniques. The double lumen video endotracheal tube differs significantly in size and physical characteristics from standard single lumen endotracheal tube and intubation may prove to be challenging even for an experienced practitioner. Therefore proper prediction of difficult intubation play a crucial role in a clinical setting. Sensitivity and specificity of existing anthropometric scales and tests used for prediction of difficult intubation seem lacking so new methods such as Thyromental Height Test (TMHT) are being introduced. 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 double lumen video endotracheal tubes in patients scheduled for elective thoracic surgical procedures. The secondary aim is to evaluate the utility of double lumen video endotracheal tubes as a novel method of lung separation.
Study Type
OBSERVATIONAL
Enrollment
60
Intubation was performed with Double Lumen Endotracheal Tube.
Intubation was performed with Double Lumen Video Endotracheal Tube.
Samodzielny Publiczny Szpital Kliniczny nr 1
Zabrze, Silesian Voivodeship, Poland
Thyromental height
The height between the anterior border of the thyroid cartilage (on the thyroid notch just between the 2 thyroid laminae) and the anterior border of the mentum (on the mental protuberance of the mandible), in supine position with mouth closed, measured with a depth gauge during routine preoperative anaesthetic visit.
Time frame: Preoperative (1 day prior to the operation)
Time of Intubation
Time of intubation defined as a time from direct laryngoscopy to proper placement of double lumen endotracheal tube measured with a timer during induction of general anesthesia.
Time frame: Intraoperatively
Airway trauma
During fiberoptic bronchoscopy after the operation airway trauma on the level of bronchus, tracheal bifurcation, trachea and vocal cords were reported, where 0 was defined as no visible trauma, 1 as a redness, 2 as oedema, 3 as hematoma and 4 as active bleeding.
Time frame: Intraoperative
Usage of fiberoptic bronchoscopy
Usage of fiberoptic bronchoscopy for proper placement of double lumen tube was noted.
Time frame: Intraoperatively
score in Cormack-Lehane scale
During direct laryngoscopy the laryngeal view is graded in Cormack-Lehane Scale by the laryngoscopist. Grade I is assigned when the glottis is fully visible, grade II when the glottis is partially visible, grade III when only the epiglottis is visible and grade IV when neither glottis nor epiglottis is visible.
Time frame: Preoperative (1 day prior to the operation)
Thyromental distance
The distance between the thyroid prominence and the most anterior part of the mental prominence of the mandible, measured with a standard centigrade ruler as the distance in centimetres with the patient in supine position, head fully extended, mouth closed, during routine preoperative anaesthetic visit.
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Time frame: Preoperative (1 day prior to the operation)
Sternomental distance
The distance in centimetres between the superior border of the manubrium sterni and the bony point of the mentum, with the patient in supine position, head fully extended, mouth closed, measured with a standard centigrade ruler, during routine preoperative anaesthetic visit.
Time frame: Preoperative (1 day prior to the operation)
score in modified Mallampati test
The oropharyngeal view is assessed in sitting position, mouth maximally opened, tongue protruded, without phonation, measured during routine preoperative anaesthetic visit.
Time frame: Preoperative (1 day prior to the operation)