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. Author manuscript; available in PMC: 2021 Jun 1.
Published in final edited form as: Resuscitation. 2020 Apr 29;151:127–134. doi: 10.1016/j.resuscitation.2020.04.024

Table 2:

Lead V1 QRS morphological changes in right ventricular strain pattern

End
QRS morphology* 		Normal SV1 decreased amplitude SV1 notch QR† iRBBB RBBB Total Patients
Starting QRS morphology*
Normal 0 3 7 4 6 25 45
SV1 decreased amplitude 0 0 0 0 1 1
SV1 notch 0 1 1 7 9
QR† 0 0 1 1
iRBBB 0 7 7
RBBB 3‡ 3
Total Patients 0 3 7 5 7 44 66
*

Each combination of row and column denotes the number of patients with starting QRS morphology (row) and end QRS morphology prior to chest compression (column) in lead V1 (eg. 6 patients with normal initial lead V1 QRS morphology had iRBBB just prior to chest compression)

†

QR was defined only when QRS duration < 100 ms

‡

These cases showed progressive widening of the R’

Abbreviations. iRBBB: incomplete right bundle branch block, RBBB: right bundle branch block