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Recent EKG shows left bundle branch block. Do I need to do a chemical stress test?

I have had a triple bypass (4 yrs) and a recent ekg shows left bundle branch block. ER doctor said needed a chemical stress test. Heart pumping function at 40% and had a convedrsion for afib . Is this test needed and what will it accomplish? I feel fine, heart rate in low 70 s, blood pressure 110/70 range. I am not comfortable with having this done. I am 62 yrs old and low kidney functions due to diabetes.
Tue, 26 Feb 2013
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Cardiologist 's  Response
Hi friend,
Welcome to Health Care Magic

Chemical (pharmacological) stress (ECHO or Treadmill) is generally done for those, who can not do physical stress.

Left Bundle Branch Block (LBBB) is an EKG finding - it may be the nerve or another infarction.
LBBB makes EKG interpretation of ischemia difficult.

It is better to have new ischemia, evaluated this way / a good alternative, short of angio (gold standard)

Take care
Wishing speedy recovery
God bless
Good luck
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