Relationship between airway parameters and screening parameters_
| DSEM (cm) | DSHB (cm) | DSAC (cm) | MMS | TMD (cm) | IIG (cm) | NC (cm) | SD (cm) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| r-value | P-value | r-value | P-value | r-value | P-value | r-value | P-value | r-value | P-value | r-value | P-value | r-value | P-value | r-value | P-value | |
| DSEM (cm) | - | - | .559 | <0.001 | .784 | <0.001 | .437 | <0.001 | -.324 | .001 | .007 | .943 | .399 | <0.001 | -.167 | .097 |
| DSHB (cm) | .559 | <0.001 | - | - | .532 | <0.001 | .550 | <0.001 | -.365 | <0.001 | -.016 | .875 | .429 | <0.001 | -.246 | .014 |
| DSAC (cm) | .784 | <0.001 | .532 | <0.001 | - | - | .530 | <0.001 | -.408 | <0.001 | .118 | .242 | .334 | .001 | -.310 | .002 |
| MMS | .437 | <0.001 | .550 | <0.001 | .530 | <0.001 | - | - | -.256 | .010 | .051 | .615 | .335 | .001 | -.284 | .004 |
| TMD (cm) | -.324 | .001 | -.365 | <0.001 | -.408 | <0.001 | -.256 | .010 | - | - | .349 | <0.001 | .065 | .519 | .419 | <0.001 |
| IIG (cm) | .007 | .943 | -.016 | .875 | .118 | .242 | .051 | .615 | .349 | <0.001 | - | - | .166 | .100 | .122 | .228 |
| NC (cm) | .399 | <0.001 | .429 | <0.001 | .334 | .001 | .335 | .001 | .065 | .519 | .166 | .100 | - | - | -.228 | .022 |
| SD (cm) | -.167 | .097 | -.246 | .014 | -.310 | .002 | -.284 | .004 | .419 | <0.001 | .122 | .228 | -.228 | .022 | - | - |
Airway evaluating parameters for predicting difficult laryngoscopy_
| Variable | Difficult (n=39) | Easy (n=61) | P-value |
|---|---|---|---|
| MMS | <0.001 | ||
| MMS 1 | 6 (15.4%) | 24 (39.3%) | |
| MMS 2 | 5 (12.8%) | 31 (50.8%) | |
| MMS 3 | 25 (64.1%) | 6 (9.8%) | |
| MMS 4 | 3 (7.7%) | 0 (0.0%) | |
| ULBT | <0.001 | ||
| ULBT 1 | 29 (74.4%) | 61 (100%) | |
| ULBT 2 | 10 (25.6%) | 0 (0%) | |
| TMD | 6.61 ± 1.02 | 7.62 ± 1.26 | <0.001 |
| IIG | 6.29 ± 0.85 | 6.34 ± 0.57 | 0.76 |
| SD | 16.34 ± 2.41 | 17.60 ± 1.57 | 0.002 |
| NC | 35.18 ± 3.14 | 33.13 ± 2.64 | 0.001 |
| DSHB | 1.03 ± 0.20 | 0.82 ± 0.13 | <0.001 |
| DSEM | 1.49 ± 0.11 | 1.14 ± 0.14 | <0.001 |
| DSAC | 1.92 ± 0.15 | 1.43 ± 0.10 | <0.001 |
Demographic data of the patients with difficult and easy laryngoscopy_
| Variable | Difficult (n = 39) | Easy (n = 61) | P-value |
|---|---|---|---|
| Age | 41.05 ± 12.97 | 38.20 ± 10.76 | 0.24 |
| Sex (M/F) | 13(33.3%)/26(66.6%) | 29(47.5%)/32(52.5%) | 0.21 |
| ASA (I/II) | 29(74.4%)/10(25.6%) | 42(68.9%)/19(31.1%) | 0.61 |
| Height | 157.97 ± 5.25 | 157.48 ± 5.63 | 0.66 |
| Weight | 63.87 ± 11.61 | 56.89 ± 9.01 | 0.01 |
| BMI | 25.59 ± 4.10 | 22.89 ± 3.21 | <0.01 |
The area under the ROC curves (AUC) for DSEM, DSHB, DSAC, TMD, and MMS_
| Variable | AUC ± SE | P-value | 95% CI |
|---|---|---|---|
| DSHB | 0.799 ± 0.052 | <0.001 | 0.698 to 0.901 |
| DSEM | 0.975 ± 0.012 | <0.001 | 0.951 to 1.0 |
| DSAC | 0.999 ± 0.001 | <0.001 | 0.997 to 1.0 |
| TMD | 0.725 ± 0.054 | <0.001 | 0.619 to 0.830 |
| MMS | 0.800 ± 0.051 | <0.001 | 0.700 to 0.899 |
Table Optimal cut-off values with sensitivity and specificity to predict difficult laryngoscopy_
| Variable | Cut-off values | Sensitivity | Specificity |
|---|---|---|---|
| DSEM | 1.34 | 93% | 82% |
| DSHB | 0.98 | 92% | 69% |
| DSAC | 1.68 | 100% | 95% |
| TMD | 6.59 | 87% | 54% |
| MMS | 2 | 90% | 72% |