before angioplasty thallium-201 perfusion scintigraphy and technetium-99m gated equilibrium ventriculography in most patients showed that stress testing ( exercise and ice water stimulation and isometric handgrip respectively ) induced myocardial perfusion defects that were associated with a mean ( sd ) drop in left ventricular ejection fraction from 64 ( 6 ) % to 56 ( 7 ) % .
C0020746
ice
C0043047
water