Strain rate-myocardial velocity gradient -postsystolic shortening Strain rate-myocardial velocity gradient -postsystolic shortening TDI/Strain imaging> sensitive Ischemia delays onset & rate of regional myo relaxation Time quantified using TDI QRS-onset of relaxation-350-400ms Interval ↓ by 34+/_10% in nl segments in response to high dose dopamine ↓in interval is <12+/-18% in ischemic seg
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