Comparing McGRATH® MAC, C-MAC®, and Macintosh Laryngoscopes Operated by Medical Students: A Randomized, Crossover, Manikin Study
Table 1
Intubation time, intubation success rate, Cormack-Lehane grade, and subjective difficulty in the normal airway.
Macintosh ()
McGRATH® MAC ()
C-MAC® ()
value
Intubation time (s)
First attempt (s)
26.9 (23.3–30.5)
25.8 (22.5–29.1)
28.5 (25.1–31.8)
0.313
Second attempt (s)
24.7 (22.1–27.3)
20.1 (17.7–22.5)
21.3 (18.9–23.7)
0.017
Third attempt (s)
23.7 (21.7–25.6)
19.5 (17.7–21.3)
19.9 (18.2–21.8)
0.001
Overall attempts (s)
26.6 (24.2–29.1)
21.8 (19.4–24.2)
23.2 (20.8–25.7)
0.003
Success rate of intubation
First attempt
31 (80)
39 (100)
39 (100)
<0.001
Second attempt
33 (85)
39 (100)
39 (100)
0.002
Third attempt
35 (90)
39 (100)
39 (100)
0.015
Overall attempts
38 (97)
39 (100)
39 (100)
0.373
Number of intubation attempts, 1/2/3
31/5/2
39/0/0
39/0/0
0.001
Cormack-Lehane grade, 1/2/3/4
First attempt
16/16/2/5
37/2/0/0
36/3/0/0
<0.001
Second attempt
18/15/1/5
37/2/0/0
34/5/0/0
<0.001
Third attempt
18/15/4/2
35/3/1/0
36/2/1/0
<0.001
Subjective difficulty, VAS (0–10)
4.6 (4.1–5.1)
2.2 (1.7–2.7)
2.2 (1.7–2.7)
<0.001
Data are presented as the median (interquartile range) or number (percentage). value <0.05 compared to the Macintosh blade. value <0.001 compared to the Macintosh blade.
