Page 16 - JSOM Fall 2024

FIGURE 6 Comparison of calculated SD1 and SD2 from constructed Poincaré plots of measured V (SD1, A-D; SD2, E-H) and RR (SD1, I-L;
T
SD2, M-P) between manual ventilation without (C, yellow circles) or with (B, purple circles).
Scenario 1 Scenario 2 Scenario 3 Scenario 4
a 160 b 160 c 50 d 3.0 ✱✱

40 2.5
120 120 2.0
SD1 V T (mL) 80 SD1 V T (mL) 80 SD1 V T (mL) 30 SD1 V T (mL) 1.5

20
40 40 1.0
10 0.5
0 0 0 0.0
C B C B C B C B

Scenario 1 Scenario 2 Scenario 3 Scenario 4
e 160 ✱✱ f 160 ✱✱ g 60 ✱✱ h 10 ✱✱✱✱

50 8
120 120 40
SD2 V T (mL) 80 SD2 V T (mL) 80 SD2 V T (mL) 30 SD2 V T (mL) 6 4

20
40
40
10 2
0 0 0 0
C B C B C B C B
Scenario 1 Scenario 2 Scenario 3 Scenario 4
i ✱✱✱✱ j k l
2.0 2.5 ✱✱✱ 2.5 16
✱✱✱
2.0 2.0 12
1.5
SD1 RR (min -1 ) 1.0 SD1 RR (min -1 ) 1.5 SD1 RR (min -1 ) 1.5 SD1 RR (min -1 ) 8 4
1.0
1.0
0.5

0.0
0.0 0.5 0.5 0
0.0
C B C B C B C B
m Scenario 1 n Scenario 2 o Scenario 3 p Scenario 4
✱✱✱
✱✱✱
5 2.5 ✱✱✱✱ 5 25 ✱✱✱
4 2.0 4 20
SD2 RR (min -1 ) 3 2 SD2 RR (min -1 ) 1.5 SD2 RR (min -1 ) 3 2 SD2 RR (min -1 ) 15

1.0
10

0.0
0 1 0.5 1 0 5 0
C B C B C B C B
BENGI use (Wilcoxon signed rank test, **P<.01, ***P<.001, ****P<.0001). N=20 participants for scenarios 1–3, and n=16 participants for
scenario 4.
BENGI = bag-valve-mask emergency narration guided instrument; RR = respiratory rate; V = tidal volume.
T
−1
participants could more easily maintain a rhythm of 60min BLS or ACLS certification, and healthcare professional stu-
−1
versus 10min (scenarios 1–3), even if the accuracy of the dents and non-students. Additionally, no consistent correla-
rhythm was markedly different from the target. tions of delivered V and RR were seen at baseline across all
T
scenarios for grip strength, palm width, and hand length. Prior
An exploratory examination of subgroups showed no consis- studies showed mixed results for these relationships. 15,17,31–33
tent significant differences in baseline V and RR across all Our study may not reveal significant relationships due to in-
T
scenarios between males and females, those with and without sufficient power to assess subgroup differences.
14 | JSOM Volume 24, Edition 3 / Fall 2024