Table 2.
Outcome Measurement
| Outcome | Back Plate Marking Method (n=20) | Standard Method (n=20) | p-value |
|---|---|---|---|
| Median (IQR) | Median (IQR) | ||
| (Min, Max) | (Min, Max) | ||
| Time to deploy back platea (s) | 15.30 (2.70) | 14.50 (3.51) | 0.40 |
| (12.00, 22.50) | (9.00, 23.00) | ||
| Time to deploy upper part of device (s) | 16 (12.38, 20.12) | 18.75 (17, 21.25) | 0.03 |
| (9.00, 33.50) | (12.00, 38.50) | ||
| Total time for deploy upper part of deviceb (s) | 16 (12.38, 20.50) | 21.00 (18, 30.12) | <0.01 |
| (9.00, 34.00) | (12.00, 50.50) | ||
| Total pause for mechanical device deployment (s) | 31.5 (27.62, 35.88) | 38.75 (31.12, 43.12) | 0.03 |
| (21.00, 53.00) | (26.00, 73.50) | ||
| Interruption for mechanical CPR device application as proportion of total “hand off” time | 43.08% | 49.18% | 0.02 |
| (38.53%, 47.51%) | (43.27%, 51.83%) | ||
| (10.21%, 56.38%) | (8.06%, 63.36%) | ||
| Longest chest compression interruption (s) | 18 (15.62, 20.50) | 18.75 (17, 21.25) | 0.11 |
| (12.00, 33.50) | (14.00, 38.50) | ||
| Duration of all compression interruptions (s) | 70.5 (65.38, 82.50) | 82.75 (70.50, 88.12) | 0.20 |
| (61.50, 400.50) | (58.50, 416.00) | ||
| Compression fractiona | 77.85% (2.13) | 76.91% (3.06) | 0.19 |
| (73.41%, 81.68%) | (69.83%, 82.16%) |
Notes: All data are presented as median unless indicated otherwise.aMean, bIncluding the time spent adjusting the suction cup after starting mechanical CPR.
Abbreviations: IQR, interquartile range; SD, standard deviation.