Table 4.
Comparison of Patient Characteristics by Whether or Not Ventilation Scores Improved Using the Tao Versus Standard Mask on the Han Scale and on the Warters Scale Before and After NMB
| Pre-NMB | Han Score | Warters Score | ||||
|---|---|---|---|---|---|---|
| Same or Worse (n = 129) | Better (n = 23) | P | Same or Worse (n = 101) | Better (n = 51) | P | |
| BMI | 29.5 (7.92) | 31.0 (7.48) | .407 | 28.6 (7.37) | 31.8 (8.41) | .018 |
| Mallampati class | .236 | .003 | ||||
| I | 34 (27.2) | 2 (8.70) | 31 (31.3) | 5 (10.2) | ||
| II | 68 (54.4) | 16 (69.6) | 55 (55.6) | 29 (59.2) | ||
| III | 22 (17.6) | 5 (21.7) | 12 (12.1) | 15 (30.6) | ||
| IV | 1 (0.80) | 0 (0.00) | 1 (1.01) | 0 (0.00) | ||
| Macroglossia (yes) | 25 (19.4) | 3(13.0) | .572 | 25 (19.4) | 3 (13.0) | .572 |
| Receding mandible (yes) | 18 (14.0) | 8 (34.9) | .030 | 9 (8.91) | 17 (33.3) | <.001 |
| Snore (yes) | 39 (30.2) | 13 (56.5) | .014 | 26 (25.7) | 26 (51.0) | .002 |
| Anticipated DMV (yes) | 30 (23.3) | 9 (39.1) | .108 | 17 (16.8) | 22 (43.1) | <.001 |
| Post-NMB | Han Score | Warters Score | ||||
|---|---|---|---|---|---|---|
| Same or Worse (n = 145) | Better (n = 7) | P | Same or Worse (n = 111) | Better (n = 41) | P | |
| BMI | 29.6 (7.99) | 31.1 (3.97) | .624 | 29.1 (7.60) | 31.2 (8.42) | .151 |
| Mallampati class | .032 | .029 | ||||
| I | 34 (24.1) | 2 (28.6) | 30 (27.8) | 6 (15.0) | ||
| II | 83 (58.9) | 1 (14.3) | 63 (58.3) | 21 (52.5) | ||
| III | 23 (16.3) | 4 (57.1) | 14 (13.0) | 13 (32.5) | ||
| IV | 1 (0.71) | 0 (0.00) | 1 (0.93 | 0 (0.00) | ||
| Macroglossia (yes) | 27 (18.6) | 1 (14.3) | 1.000 | 16 (14.4) | 12 (29.3) | .036 |
| Receding mandible (yes) | 24 (16.6) | 2 (28.6) | .343 | 18 (16.2) | 8 (19.5) | .632 |
| Snore (yes) | 47 (32.4) | 5 (71.4) | .047 | 37 (33.3) | 15 (36.6) | .708 |
| Anticipated DMV (yes) | 35 (24.1) | 4 (57.1) | .072 | 23 (20.7) | 16 (39.0) | .022 |
Continuous variables are reported as mean (SD) and categorical variables as n (%). P values are for the test of association between patient characteristics with improvement on the Han scale or Warters scale using the Tao compared to the standard mask before and after NMB.
Abbreviations: BMI, body mass index; DMV, difficult mask ventilation; NMB, neuromuscular blockade.