Prognostic value of normal exercise Tc-99m Sestamibi myocardial perfusion imaging in Karachi, Pakistan

Objective: to ascertain the hard event rate in local population with normal myocardial perfusion.methods: the study, which was conducted from august 2006 to january 2007, included 300 patients with normal exercise myocardial perfusion scan (mps). patients were categorized according to their pre-test probabilities for cad. patients with low pre-test probability for cad were 136 and ranked in group a, while group b constituted 164 patients who had intermediate to high pre-test probability.results: during a follow-up of mean duration of 27 ± 3 months, an overall hard cardiac event rate of 1.02% was noted. however, a statistically non-significant difference between the survival rates of low and high pre-test probability groups was also observed.conclusion: the study demonstrated good prognosis for patients with normal exercise myocardial perfusion scan