The Effect of a Mechanical Compression Device and Supraglottic Airway on Flow Time: A Simulation Study of Out-of-Hospital Cardiac Arrest in a High-Rise Building
Table 2
Comparison of chest compression indices and flow times.
Manual compression groups
Mechanical compression groups
p
MAB
MAS
MEB
MES
Chest compression index:
Compression depth (mm)†
57.2 ± 2.4
56.8 ± 2.9
56.0 ± 2.0
55.1 ± 2.2
0.41
Compression rate (n/min) †
113.6 ± 4.6
113.7 ± 3.6
111.3 ± 2.0
111.0 ± 1.9
0.21
Incomplete chest recoil ratio (%)‡
5.0 (4.3–9.3)
6.0 (3.3–8.8)
11.0 (8.3–16.8)
8.5 (6.0–10.8)
0.47
Flow time fraction (%)‡
66.5 (61.7–67.3) †
72.1 (69.2–72.7) ‡
70.5 (67.6–71.8) ‡
75.5 (73.9–76.8) §
<0.001
Flow time (s)†
290.3 ± 13.3 †
332.2 ± 27.1 ‡
348.6 ± 12.0 ‡
378.2 ± 16.5 §
<0.001
Scenario duration (s)†
446.8 ± 22.4 †
472.9 ± 30.6 †
500.6 ± 24.9 ‡
501.3 ± 20.7 ‡
<0.001
Activity during no-flow time:
Rhythm analysis and defibrillator charging (s)†
13.9 ± 5.3
15.4 ± 3.5
12.4 ± 3.7
11.6 ± 4.5
0.10
Artificial ventilation (s)†
66.2 ± 12.6 ‡
49.6 ± 6.0 †
73.6 ± 9.2 §
52.8 ± 7.9 †
<0.001
Moving the manikin (s)†
76.8 ± 14.7 ‡
70.2 ± 10.9 ‡
3.4 ± 4.3 †
3.3 ± 7.9 †
<0.001
Mechanical compressor deployment (s)†
Not applicable
Not applicable
62.6 ± 9.0
55.4 ± 12.8
0.15
Flow time fraction by phase:
Phase 1 (%)‡
80.5 (76.6–81.7) §
81.4 (80.3–83.6) §
63.5 (59.6–65.4) †
67.1 (64.9–68.8) ‡
<0.001
Phase 2 (%)‡
0.0 (0–0) †
0.0 (0–0) †
91.9 (86.3–90.1) ‡
100.0 (96.33–100.0) §
<0.001
Phase 3 (%)‡
84.6 (82.9–86.6) †
98.4 (98.1–100.0) ‡
88.5 (86.3–90.1) †
100.0 (100.0–100.0) §
<0.001
Phase 4 (%)‡
0.0 (0–0) †
0.0 (0–0) †
84.2 (80.0–88.7) ‡
100.0 (100.0–100.0) §
<0.001
Data are presented as the mean ± standard deviation or median (interquartile range). MAB, manual compression with bag-valve mask; MAS, manual compression with supraglottic airway; MEB, mechanical compression with bag-valve mask; MES, mechanical compression with supraglottic airway. †, ‡, § Significant between group differences demonstrated in the post hoc analysis.
