Betelihem GirmaAlebachew Asmro2023-12-092023-12-092023-04-29http://etd.aau.edu.et/handle/123456789/490The preoperative assessment determines anatomical features that contribute to difficult laryngoscopy. The magnitude of difficult laryngoscopy ranged from 6% to 27%. Poor patient evaluation can cause unanticipated difficult intubation and severe adverse effects. A variety of tests were used both separately and together, with varying degrees of success. However, it is unclear which of these bedside tests is best at predicting difficult laryngoscopies. Objective: - To compare the effectiveness of neck circumference, neck circumference to thyromental distance ratio, the ratio of height to thyromental distance, upper lip bite, and modified mallampati tests to predict difficult laryngoscopy among elective adult surgical patients at Addis Ababa Referral Hospitals, Ethiopia from February 1 to April 30, 2023 Methods: - The multicentered cross-sectional study was carried out on 190 study participants from February 1 to April 30, 2023. Statistical analysis was done using a chi-square test and a student t-test. A P value of < 0.05 was considered statistically significant. The receiver-operating characteristic (ROC) curves were used to diagnose the significance of predictors of difficult laryngoscopy and the cut-off points. The Diagnostic parameters like sensitivity, specificity, Positive predictive value, and negative predictive value were carried out using crosstabs on SPSS, whereas the positive likelihood ratio, negative likelihood ratio, and accuracy were calculated manually from the descriptive statistics. Result: - The magnitude of difficult laryngoscopy in this study was 13.2%. The cutoff values of Neck circumference, Neck circumference to thyromental distance ratio, and the ratio of height and thyromental distance were >37cm, >4.66 cm, and >22 cm, respectively. The upper lip bit test and the ratio of height and thyromental distance were the most sensitive, specific, high Positive predictive value, and diagnostic accuracy tests (76%, 98.2%, 86.4%, 96.4%, and 95.2%) and (72%, 95.8%, 72%, and 92.6%), respectively. Neck circumference was the least sensitive single test, with a sensitivity of 60%. Conclusion: - The upper lip bit test was the most accurate single test, and neck circumference had the least screening ability for predicting difficult laryngoscopy in the study population.en-USThesis