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Predicting Difficult Intubation by using Modified Mallampati (MMT) with or without Thyromental Height Test (TMHT).

A K Azad1, D Banik, A F Hoque

  • 1Dr Mohammad Abul Kalam Azad, Medical Officer, Department of Anesthesia, Analgesia & Intensive Care Medicine (AA&ICM), Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh;

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Summary

Predicting difficult tracheal intubation is crucial for patient safety. Combining the Modified Mallampati Test (MMT) with the Thyromental Height Test (TMHT) offers superior accuracy in identifying potential airway challenges before anesthesia.

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Area of Science:

  • Anesthesiology
  • Airway Management
  • Diagnostic Accuracy

Background:

  • Failed tracheal intubation is a leading cause of anesthesia-related morbidity and mortality.
  • Early identification of potential difficult airways is essential for safe anesthetic practice.
  • Standardized tests aid in predicting difficult endotracheal intubation.

Purpose of the Study:

  • To evaluate the efficacy of the Modified Mallampati Test (MMT) combined with the Thyromental Height Test (TMHT) for predicting endotracheal intubation difficulty.
  • To compare the predictive accuracy of MMT with TMHT versus MMT alone.

Main Methods:

  • Prospective observational study involving 202 patients undergoing general anesthesia.
  • Patients were assessed using MMT with TMHT and MMT alone prior to intubation.
  • Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy were calculated.

Main Results:

  • Both MMT with TMHT and MMT alone demonstrated high predictive values (Sensitivity 100%, Specificity 96%, PPV 96.2%, NPV 100%, Accuracy 98%).
  • No significant differences in demographic data (age, gender, BMI) were observed between groups.
  • MMT combined with TMHT showed a slightly improved prediction of intubation difficulty compared to MMT alone.

Conclusions:

  • The Modified Mallampati Test combined with the Thyromental Height Test is a highly accurate and reliable method for predicting difficult tracheal intubation.
  • This combined approach enhances pre-anesthetic airway assessment, contributing to improved patient safety.
  • Routine use of MMT with TMHT can aid anesthesiologists in preparing for challenging intubations.