Table 4:

Imaging and Autopsy correlation of right ventricular strain ECG pattern

	Development Cohort		Validation Cohort		Entire Cohort
	RV Strain by ECG (n = 35)	No RV Strain by ECG (n = 38)	RV Strain by ECG (n = 21)	No RV Strain by ECG (n = 19)	RV Strain by ECG (n = 56)	No RV Strain by ECG (n = 57)
Chest CT Angiogram for Pulmonary Embolism*, n	5	2	5	1	10	3
Positive, n (%)	0	0	2 (40)	0	2 (20)	0
Negative, n (%)	5 (100)	2 (100)	3 (60)	1 (100)	8 (80)	3 (100)
Autopsy - Pulmonary embolism†, n	7	5	6	5	13	10
Positive, n (%)	2 (29)	0	2 (33)	0	4 (31)	0
Negative, n (%)	5 (71)	5 (100)	4 (67)	5 (100)	9 (69)	10 (100)
Echocardiogram - post arrest‡, n	14	7	8	7	22	14
New isolated RV dysfunction§, n(%)	5 (36)	0	4 (50)	1 (14)‖	9 (41)	1 (7)
New isolated LV dysfunction, n(%)	0	1 (14)	0	2 (29)	0	3 (21)
New biventricular dysfunction, n(%)	2 (14)	2 (29)	1 (13)	0	3 (14)	2 (14)
No change, n(%)	7 (50)	4 (57)	3 (37)	4 (57)	10 (45)	8 (57)

^*Positive result denote studies showing evidence of massive or submassive pulmonary embolus. Negative results denote studies showing no pulmonary embolism, segmental or subsegmental embolus without evidence of right ventricular strain by CT. Positive studies include those performed up to 24 hours pre-arrest, and those post-arrest. Negative studies must be performed post-arrest

^†Positive autopsy shows large burden of pulmonary embolism deemed to be the likely cause of cardiac arrest

^‡Performed within 24 hours post-cardiac arrest

^§Enlargement, decrease in systolic function, or volume and/or pressure overload not previously present

^‖his patient developed possible R strain C pattern post-arrest

Abbreviations. CT: computed tomography, LV: left ventricle, RV: right ventricle