Prognosis

Survival is worse in: 

• out-of-hospital arrests ^b
• asystole or pulseless electrical activity ^{a b}  
• elderly patients ^b  

Why?

Survival is best in hospital and with VT/VF arrests

survival to discharge a b	in-patients  (95% CI)	out-patients  (95% CI)
all patients	13% to 22%	-
VF/VT arrest	20%  (18% to 22%)	8%  (5% to 10%)
other rhythm	10%  (8% to 11%)	-
PEA	-	4%  (2% to 6%)
asystole	-	1.3%  (0.8% to 1.7%)
elderly patients	7% to12%	0.82%  (0.0% to 2.0%)