RT Journal
A1 Norris SL
T1 CLinical practice guidelines and scientific evidence
JF JAMA
JO JAMA
YR 2009
FD July 8
VO 302
IS 2
SP 142
OP 147
DO 10.1001/jama.2009.908
UL http://dx.doi.org/10.1001/jama.2009.908
AB 
To the Editor: Dr Tricoci and colleagues1 published an analysis indicating that American College of Cardiology/American Heart Association (ACC/AHA) guidelines are largely developed from lower levels of evidence or expert opinion. They concluded that there is a “need to improve the process of writing guidelines and to expand the evidence base from which clinical practice guidelines are derived.” Their first conclusion could have been better substantiated by a critical appraisal of the ACC/AHA guideline methods.2