The patient was a 56 Y/O man with history of lateral wall MI, who was referred for
Myocardial viability study. His recent cardioangiography was as follow:
LAD: 85% stenosis at proximal part.
Diagonal(s): Normal.
LCX: 95% stenosis at proximal part.
RCA: 80% stenosis at proximal and mid parts.
EF: 45%.
His echocardiography showed a moderate MR.

For evaluation of the viability both nitrate and O₂ were used before Tc-99m MIBI administration
to enhance the radiotracer myocardial extraction. On the other hand for concomitant evaluation
of myocardial perfusion and ventricular function the study was performed in two separate phases:
Rest study without and during continuous infusion of Dobutamine ( LDD, 7.5 mg/min).
Both studies were carried out with gated SPECT technique (Fig 1). face=Tahoma size=2>
Two-Phases imaging analysis was indicative of lateral wall infarction with mild viability and
functional study demonstrated hypokinesia and decreased systolic wall thickening in
same region. However there was a significant enhance wall thickening and contractile response to
Dobutamine in systolic phase and there was rise of EF from 29% to 38%.
So, because of suitable preserved contractile capacity good salvegeability in this infarcted
(Lat) myocardial wall after revascularization surgery is predicted.