TABLE 1.
Baseline Characteristics of Patients Intubated With Macintosh Size Three Versus Size Four
| Patient Characteristics | Before IPW | p | After IPW | p | ||
|---|---|---|---|---|---|---|
| Mac 3 | Mac 4 | Mac 3 | Mac 4 | |||
| Number of Pts | 222 | 362 | ||||
| Age | 59.0 (47.0–67.0) | 59.0 (46.3–68.0) | 0.91 | 57.6 (46.6–68.4) | 56.8 (46.0–67.2) | 0.52 |
| Weight (kg)a | 71.7 (60.8–86.2) | 83.0 (71.2–98.9) | 0.00 | 83.1 (64.2–94.6) | 83.1 (66.0–97.5) | 0.99 |
| Height (cm)a | 168.8 (160.0–175.3) | 173 (166.9–180.3) | 0.00 | 171.5 (162.6–177.8) | 171.5 (164.8–180.1) | 0.83 |
| Body mass indexa | 26.1 (22.0–30.7) | 27.2 (23.8–32.8) | 0.01 | 28.6 (23.4–31.9) | 28.1 (22.5–32.6) | 0.5 |
| Gender (male) | 103 (46%) | 230 (64%) | 0.00 | 59% | 59% | 0.89 |
| Whitea | 153 (69%) | 267 (74%) | 0.24 | 72% | 71% | 0.77 |
| Acute Physiology and Chronic Health Evaluation II | 21.0 (16.0–27.0) | 22.0 (16.0–27.0) | 0.92 | 22.1 (15.3–26.3) | 22.3 (15.4–26.8) | 0.8 |
| Reason for intubation: | ||||||
| Hypoxemia | 102 (46%) | 158 (44%) | 0.64 | 45.3% | 48.4% | 0.47 |
| Hypoxemia and hypercapnia | 22 (10%) | 50 (14%) | 0.21 | 15.2% | 12.2% | 0.3 |
| Airway compromise | 12 (5%) | 13 (4%) | 0.40 | 3.4% | 3.8% | 0.78 |
| Any difficult airway characteristicsa | 96 (43%) | 174 (48%) | 0.29 | 50.0% | 48.8% | 0.77 |
| Limited neck mobility | 6 (3%) | 8 (2%) | 0.92 | 1.9% | 2.5% | 0.66 |
| Limited mouth opening | 4 (2%) | 11 (3%) | 0.52 | 2.8 (1.3%) | 2.3% | 0.36 |
| Methods of preoxygenation | ||||||
| Bag-mask ventilation | 54 (24%) | 85 (23%) | 0.89 | 26.6% | 26.5% | 0.97 |
| Noninvasive ventilation | 43 (19%) | 96 (27%) | 0.06 | 20.3% | 23.7% | 0.34 |
| High-flow nasal cannula | 21 (9%) | 29 (8%) | 0.65 | 17.3 (7.8%) | 8.1% | 0.88 |
| Nonrebreather | 95 (43%) | 134 (37%) | 0.19 | 41.3% | 37.1% | 0.31 |
| Baseline saturationa | 100.0 (96.0–100.0) | 99.0 (95.0–100.0) | 0.08 | 96.9 (95.5–99.8) | 96.8 (95.0–99.5) | 0.95 |
| Baseline SBPa | 121.9 (106.0–138.0) | 122.1 (107.3–138.0) | 0.71 | 126.2 (105.9–139.3) | 125.8 (106.4–139.7) | 0.86 |
| Any neuromuscular blockade | 209 (94%) | 352 (97%) | 0.1 | 96.7% | 97.0% | 0.81 |
IPW = inverse probability weighting, Mac 3 = Macintosh size 3 blade, Mac 4 = Macintosh size 4 blade, SBP = systolic blood pressure.
a
Imputation method used for missing values.
See Text for details of all difficult airway characteristics.
Interquartile range or percentage of the total.