I don't do routine office EKGs on any asymptomatic patient with a normal exam. Resting EKG is just not sensitive or specific enough to be valuable. False positive tests greatly outnumber early detection of CAD in asymptomatic adults.
I do office EKGs on patients seen with murmurs or irregular rhythms by exam. I also do them if the patient was told by a previous MD about an abnormal EKG, or if they use meds that affect the EKG (but I guess these aren't really "asymptomatic" patients).
Patients can be evaluated with the
NCEP Risk Assessment Tool -- which does not include the EKG. Asymptomatic patients with less than 1% 10 year risk get followed. Asymptomatic patients with over 20% risk need aggressive risk factor modification, but it isn't clear that further testing is useful, since revascularization (if ischemia occurs on further studies) alone doesn't seem to prolong life.
It's the intermediate group that gives me trouble, cardiac event risk over 5% and below 20%. I usually send these patients for exercise testing, or coronary CT if they have coverage, to see how aggressive to get with their lifestyle modifications and drugs. But an EKG doesn't help here either.