SHA 004. Diagnostic valve of nitrate enhanced Tc-99m sestamibi gated myocardial spect in myocardial viability: Prospective analysis

ically indicated CCT. Methods: All patients were scanned using retrospective gating on a 64-slice CCT, for clinically indicated reasons, where coronary CT angiogram and calcium score measurements were performed. The amount of radiation was calculated from different parameters in millisievert (mSv). Results: 1287 patients were scanned with mean age of 52 ± 13.2 y, 65% males, and 35% females. Chest pain was the indication in 80% of cases. There mean radiation dose was 15 ± 10.4 (mSv). Patients with body mass index (BMI) P 35 received more radiation compared to those with BMI < 30 was, 15.3 ± 9.3 vs. 14.6 ± 7.4 (mSv), p< 0.002. Patients who had coronary bypass surgery (CABG) received significantly higher dose of radiation, 22.2 ± 9.3 vs. 14.4 ± 10.4 (mSv), P < 0.0001. Conclusion: Overweight patients and patients who underwent CABG are exposed to significantly higher radiation dose during CCT. Measures have to be applied to minimize the radiation dose during CCT.