TABLE 2.
Adjusted Outcomes Comparing Macintosh Curved Blades 3 and 4
| Adjusted Outcomes | Macintosh Size 3 Blade | Macintosh Size 4 Blade | p | Adjusted OR (CI) |
|---|---|---|---|---|
| Duration of intubation (s)a | 125.0 (90–200.3) | 142.0 (88–218.8) | 0.249 | 0.883 (0.718–1.086) |
| Median lowest o2 saturation (%)a | 93.5 (84.1–99.0) | 93.5 (81.6–97.8) | 0.97 | 1 (0.778–1.27) |
| Severe hypoxemiaa | 33.1 (15.2%) | 42.8 (12.2%) | 0.501 | 0.772 (0.362–1.643) |
| First-pass successa | 177.0 (81.2%) | 249.0 (71.1%) | 0.007 | 0.566 (0.372–0.850) |
| Cormack-Lehane grade view | 0.019 | 1.458 (1.064–2.003) | ||
| I | 105.6 (48.4%) | 135.7 (38.8%) | ||
| II | 65.4 (30.0%) | 116.4 (33.2%) | ||
| III | 35.4 (16.2%) | 72.0 (20.6%) | ||
| IV | 11.6 (5.3%) | 26.0 (7.4%) | ||
| Additional equipment: | 35.9 (16.4%) | 57.8 (16.4%) | 0.988 | 1.003 (0.638–1.594) |
| Direct laryngoscopy | 8.0 (3.6%) | 7.9 (2.2%) | 0.334 | 0.611 (0.221–1.691) |
| Video laryngoscopy | 27.9 (12.8%) | 49.8 (14.2%) | 0.629 | 1.131 (0.692–1.880) |
| Repositiona | 4.8 (7.9%) | 5.2 (4.6%) | 0.323 | 0.522 (0.140–1.987) |
| Complications | ||||
| Aspiration | 8.7 (4.0%) | 10.0 (2.8%) | 0.47 | 0.71 (0.280–1.839) |
| Esophageal intubation | 5.8 (2.7%) | 9.8 (2.8%) | 0.917 | 1.057 (0.382–3.204) |
| Airway trauma | 0.9 (0.0%) | 0.9 (0.0%) | 0.739 | 0.597 (0.015–21.87) |
| Cardiac arrest | 2.8 (1.3%) | 5.4 (1.5%) | 0.803 | 1.203 (0.295–6.195) |
| Outcomes | ||||
| 1-hr mortality | 5.2 (2.3%) | 2.2 (0.6%) | 0.091 | 0.252 (0.039–1.13) |
| Ventilator-free days, median | 15.0 (0.0–25.0) | 17.0 (0.0–25.0) | 0.504 | 0.767 (0.530–1.064) |
| ICU length of stay, mediana | 6.0 (3.0–9.0) | 6.0 (3.0–10.0) | 0.307 | 1.072 (0.936–1.228) |
OR = odds ratio.
a
Imputation method used for missing values.
Outcomes adjusted for age, sex, race, height, body mass index, Acute Physiology and Chronic Health Evaluation II score, indications for intubation (compromised airway, hypoxia, hypercapnia), limited neck mobility, preoxygenation method, operator experience with intubation, and trial site.
Interquartile range or percentage of total.