title: Validation of modified Mallampati test with addition of thyromental distance and sternomental distance to predict difficult endotracheal intubation in adults.
abstract: OBJECTIVE
  Intubation is often a challenge for anaesthesiologists. Many parameters assist to predict difficult intubation. The present study was undertaken to assess the validity of different parameters in predicting difficult intubation for general anaesthesia (GA) in adults and effect of combining the parameters on the validity.
  
  
  METHODS
  The anaesthesiologist assessed oropharynx of 135 adult patients. Modified Mallampati test (MMT) was used and the thyromental distance (TMD) and sternomental distances (SMD) for each of the patients were also measured. The Cormack and Lehane laryngoscopic grading was assessed following laryngoscopy. The validity parameters such as sensitivity, specificity, false positive and negatives values, positive and negative predictive values were calculated. The effect of combining different measurements on the validity was also studied. Univariate analysis was performed using the parametric method.
  
  
  RESULTS
  The study group comprised of 135 patients. The sensitivity and specificity of MMT were 28.6% and 93%, respectively. The TMD (<6.5 CM) had sensitivity and specificity of 100% and 75.8%, respectively. The SMD (<12.5 CM) had sensitivity and specificity of 91% and 92.7%, respectively. Combination of MMT grading and TMD and SMD measurements increased the validity (sensitivity of 100% and specificity of 92.7%).
  
  
  CONCLUSIONS
  MMT had high specificity. The validity of combination of MMT, SMD and TMD as compared to MMT alone was very high in predicting difficult intubation in adult patients. All parameters should be used in assessing an adult patient for surgery under GA.
authors: Department of Anesthesia, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia.
authors: Bhavdip
authors: B
authors: Patel
authors: Department of Anesthesia, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia.
authors: Rajiv
authors: R
authors: Khandekar
authors: Department of Anesthesia, SAL Hospital, Ahmedabad, Gujarat, India.
authors: Rashesh
authors: R
authors: Diwan
authors: Department of Anesthesia, SAL Hospital, Ahmedabad, Gujarat, India.
authors: Ashok
authors: A
authors: Shah
keywords: Anaesthesia; endotracheal intubation; modified Mallampatti test; validity