EVALUATION OF DIFFERENT AIRWAY TESTS IN PREDICTING DIFFICULT AIRWAY IN ELDERLY DIABETIC AND NON-DIABETIC PATIENTS UNDERGOING SURGERY UNDER GENERAL ANAESTHESIA
Background: Diabetes mellitus introduces unique pathophysiological alterations in connective tissue and joint mobility that may predispose elderly patients to difficult airway management. Despite this, comparative data on the performance of specific bedside airway assessment tools in elderly diabetic versus non-diabetic populations remains limited.Aims and Objectives: This study aimed to evaluate and compare the diagnostic accuracy of the Upper Lip Bite Test (ULBT), Modified Mallampati Score (MMS), Palm Print Sign (PPS), and neck range of movement in predicting difficult laryngoscopy among elderly diabetic and non-diabetic patients undergoing elective surgery under general anaesthesia.Methods: A cross-sectional interventional comparative study was conducted at R.L. Jalappa Hospital and Research Centre, Kolar, from May 2023 to March 2025. A total of 184 patients aged ≥60 years were enrolled — 92 diabetic and 92 non-diabetic. Preoperative airway assessment was performed using ULBT, MMS, PPS, and neck range of movement. Intraoperative laryngoscopic view was graded using the Cormack-Lehane (CL) system. Number of intubation attempts, time to intubation, and need for alternative methods were recorded. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) were calculated for each test.Results: Difficult laryngoscopy (CL Grade III–IV) was significantly more frequent in diabetic patients (34.8% vs. 17.6%, p=0.010). Class III ULBT was found in 38.0% of diabetic patients versus 4.3% of non-diabetic patients (p<0.001). Difficult Palm Print Sign grades were more prevalent in diabetic patients (26.1% vs. 7.6%, p=0.001). Prolonged intubation time occurred in 10.9% of diabetic patients compared to 3.3% of non-diabetic patients (p=0.048). In diabetic patients, ULBT demonstrated the highest sensitivity (90.6%) and specificity (90.0%), followed by MMS (sensitivity 75.0%, specificity 100%) and PPS (sensitivity 65.6%, specificity 95.0%). In non-diabetic patients, MMS showed the highest sensitivity (75.0%), while ULBT and PPS had excellent specificity.Conclusion: Elderly diabetic patients carry a significantly higher risk of difficult laryngoscopy. The Upper Lip Bite Test is the most sensitive predictor in this group, while Modified Mallampati Score performs better in non-diabetic patients. Comprehensive multi-test preoperative airway assessment is strongly recommended for elderly diabetic patients