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Poor prognostic value of the modified Mallampati score: a meta-analysis involving 177 088 patients
L H Lundstrøm1, M Vester-Andersen, A M Møller
1Department of Anaesthesia and Intensive Care, Herlev Hospital, Copenhagen University Hospital, Herlev, Denmark.
Abstract:
The modified Mallampati score is used to predict difficult tracheal intubation. We have conducted a meta-analysis of published studies to evaluate the Mallampati score as a prognostic test. A total of 55 studies involving 177 088 patients were included after comprehensive electronic and manual searches. The pooled estimates from the meta-analyses were calculated based on a random-effects model and a summary receiver operating curve. Meta-regression analyses were performed to explore sources of possible heterogeneity between the studies. The summary receiver operating curve demonstrated an area under the curve of 0.75. The pooled odds ratio for a difficult intubation with a modified Mallampati score of III or IV was 5.89 [95% confidence interval (CI), 4.74-7.32]. The pooled estimates of the specificity and sensitivity were 0.91 (CI, 0.91-0.91) and 0.35 (CI, 0.34-0.36), respectively. The pooled positive and negative likelihood ratios were 4.13 (CI, 3.60-4.66) and 0.70 (CI, 0.65-0.75), respectively. The meta-analyses had statistical and clinical heterogeneity ranging from 87.2% to 99.4%. Meta-regression analyses did not identify any significant explanation of the heterogeneity. We conclude that the prognostic value of the modified Mallampati score was worse than that estimated by previous meta-analyses. Our assessment shows that the modified Mallampati score is inadequate as a stand-alone test of a difficult laryngoscopy or tracheal intubation, but it may well be a part of a multivariate model for the prediction of a difficult tracheal intubation.
Insights
The modified Mallampati score is not a reliable standalone predictor for difficult tracheal intubation. This meta-analysis indicates its prognostic value is insufficient, suggesting it should be part of a larger predictive model.
Area of Science:
- Anesthesiology
- Critical Care Medicine
- Otolaryngology
Background:
- The modified Mallampati score is a widely used clinical tool to predict difficult tracheal intubation.
- However, its accuracy and prognostic value as a standalone test remain debated.
Purpose of the Study:
- To conduct a comprehensive meta-analysis evaluating the modified Mallampati score's effectiveness in predicting difficult tracheal intubation.
- To assess its diagnostic accuracy using pooled estimates of sensitivity, specificity, and likelihood ratios.
Main Methods:
- A systematic review and meta-analysis of published studies were performed.
- Data from 55 studies, including 177,088 patients, were analyzed using random-effects models and summary receiver operating characteristic (SROC) curves.
- Meta-regression was employed to investigate heterogeneity.
Main Results:
- The SROC curve showed an area under the curve (AUC) of 0.75.
- A modified Mallampati score of III or IV yielded a pooled odds ratio of 5.89 for difficult intubation.
- Pooled sensitivity was 0.35 and specificity was 0.91, with positive and negative likelihood ratios of 4.13 and 0.70, respectively. Significant heterogeneity was observed across studies.
Conclusions:
- The modified Mallampati score demonstrates inadequate prognostic value as a standalone predictor for difficult laryngoscopy or tracheal intubation.
- Its performance appears worse than previously estimated, highlighting the need for caution when relying solely on this score.
- The score may be more useful as a component within a multivariate model for predicting difficult tracheal intubation.
