Prognostic implications of conversion from nonshockable to shockable rhythms in out-of-hospital cardiac arrest

Table 3 Subgroup analyses for 1-month outcomes in subsequently shocked cohort ^a

Subsequently shocked cohort characteristics (N=21,944)	1-month survival				1-month CPC category 1 or 2
Subsequently shocked cohort characteristics (N=21,944)	n	Rate (%)	Crude OR (95% CI)	Adjusted OR^b(95% CI)	n	Rate (%)	Crude OR (95% CI)	Adjusted OR^b(95% CI)
Initial cardiac rhythm
Asystole, n =13,936, 63.5%	499	3.58	Reference	Reference	143	1.03	Reference	Reference
PEA, n =8,008, 36.5%	556	6.94	2.01 (1.77 to 2.28)	1.61 (1.41 to 1.83)	250	3.12	3.11 (2.53 to 3.83)	2.24 (1.80 to 2.79)
Epinephrine administration
No, n =19,061, 86.9%	914	4.80	Reference	Reference	359	1.88	Reference	Reference
Yes, n =2,883, 13.1%	141	4.89	1.02 (0.85 to 1.22)	0.84 (0.68 to 1.01)	34	1.18	0.62 (0.43 to 0.87)	0.43 (0.29 to 0.61)

^aCI, Confidence interval; CPC, Cerebral Performance Categories scale; OR, Odds ratio; PEA, Pulseless electrical activity. ^bAdjustment for potential confounders included ten variables: years, age, sex, witnessed arrest, witnessed arrest by emergency medical services personnel, bystander cardiopulmonary resuscitation, presumed cardiac etiology, initial cardiac rhythm, call-to-response time and epinephrine administration.

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