Clinical significance of reverse redistribution on technetium-99m tetrofosmin single-photon emission computed...

The clinical and prognostic significance of reverse redistribution on technetium-99m (^99mTc) single-photon emission computed tomography (SPECT) is unclear.

To determine outcomes of chest pain patients showing reverse redistribution after ^99mTc tetrofosmin SPECT versus SPECT showing no reverse redistribution.

Patient outcomes (death, nonfatal myocardial infarction, coronary artery bypass grafting and percutaneous transluminal coronary angioplasty) within 18 months after ^99mTc tetrofosmin SPECT were determined in two populations of ambulatory patients, most of whom had been evaluated because of chest pain: a population of 57 patients whose SPECT images showed reverse redistribution without reversible or fixed defects, versus a control population of 98 patients whose SPECT images were normal (no reverse redistribution, no reversible defects, no fixed defects).

Stepwise logistic regression analysis showed that the population of patients with reverse redistribution did not have a worse 18-month outcome in comparison with the control population of patients without reverse redistribution (3.5% versus 9.2%, respectively; p=0.15 corrected for age and gender).

Reverse redistribution on ^99mTc tetrofosmin SPECT does not appear to be an unfavourable prognostic factor in ambulatory chest pain patients.