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