RT Journal
A1 Andersen L, Graver A, Donnino MW
T1 USe of epinephrine for cardiac arrest prior to hospital arrival
JF JAMA
JO JAMA
YR 2012
FD July 4
VO 308
IS 1
SP 29
OP 31
DO 10.1001/jama.2012.5940
UL http://dx.doi.org/10.1001/jama.2012.5940
AB 
The cohort of patients receiving epinephrine comprised a fraction of the overall population (15 030 of 417 188; 4%) for reasons not addressed by the authors and that could represent selection bias. Given that epinephrine was part of the treatment algorithm, insight into reasons for this would allow for better interpretation of the data.