title: Thyromental height test for prediction of difficult laryngoscopy in patients undergoing coronary artery bypass graft surgical procedure.
abstract: BACKGROUND
  Patients undergoing coronary artery bypass graft (CABG) procedures have higher incidence of difficult laryngoscopy and intubation than general surgery population. Accurate prediction of difficult laryngoscopy in CABG patients is desirable to reduce the hemodynamic response and myocardial oxygen requirements. Recently, thyromental height test (TMHT) has been proposed as one of the highly sensitive and specific bedside tests to predict difficult airway. We, in our prospective observational study, evaluated the accuracy of the TMHT in predicting difficult laryngoscopy.
  
  
  METHODS
  A total of 345 patients undergoing CABG of either sex, in the age group of 35-80 years, American Society of Anesthesiologists 111, undergoing CABG, were studied. Airway assessment was performed with modified Mallampati test with the addition of thyromental distance, sternomental distance, and TMHT. Intraoperatively, direct laryngoscopy was done in accordance with Cormack and Lehane grade of laryngoscopy. The preoperative data and laryngoscopic findings were used together to evaluate the accuracy of TMHT. The sensitivity, specificity, positive and negative predictive values of other three tests were calculated according to standard formula.
  
  
  RESULTS
  A total of 345 patients were in the group with mean age of study population at 56.7 (standard deviation 9.1) years (35-80 years). This study showed that almost all tests had good specificity, but sensitivity was poor. However, sensitivity of TMHT was 75% with accuracy of 95%. Receiver operating characteristic curve analysis of TMHT-derived cutoff was 52.17 which increased sensitivity to 81.25% and specificity to 92.3%.
  
  
  CONCLUSIONS
  TMHT had a higher sensitivity compared to other tests along with good positive and negative predictive value and a very high specificity.
authors.affiliation: Department of Cardiac Anaesthesia and Critical Care, Narayana Hrudayalaya, Bengaluru, Karnataka, India.
authors.forename: Nilesh
authors.initials: N
authors.lastname: Jain
authors.affiliation: Department of Cardiac Anaesthesia and Critical Care, Narayana Hrudayalaya, Bengaluru, Karnataka, India.
authors.forename: Sucharita
authors.initials: S
authors.lastname: Das
authors.affiliation: Department of Cardiac Anaesthesia and Critical Care, Narayana Hrudayalaya, Bengaluru, Karnataka, India.
authors.forename: Muralidhar
authors.initials: M
authors.lastname: Kanchi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001837:Body Weights and Measures / Q000379:methods*; D002680:Chin / Q000033:anatomy & histology; D001026:Coronary Artery Bypass; D005260:Female; D006801:Humans; D007828:Laryngoscopy; D008297:Male; D008334:Mandible / Q000033:anatomy & histology; D008875:Middle Aged; D011237:Predictive Value of Tests; D011300:Preoperative Care / Q000379:methods*; D011446:Prospective Studies; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013249:Sternum / Q000033:anatomy & histology; D013961:Thyroid Gland / Q000033:anatomy & histology