Quantification of left ventricular function with thallium-201 and technetium-99m-sestamibi myocardial gated SPECT.

UNLABELLED

Myocardial gated SPECT with 99mTc-sestamibi has been used to quantify left ventricular function. The purpose of this study was to determine if myocardial gated SPECT with 201Tl was possible and reliable to quantify left ventricular function.

METHODS

One hundred and four patients referred for a myocardial perfusion study were included. Myocardial gated SPECT acquisition was performed 15 min after the intravenous injection of 111 MBq (3mCi) 201Tl and at 1 hr postinjection of 925 MBq (25 mCi) 99mTc-sestamibi. A commercially available automated myocardial gated SPECT processing software was used. Parameters evaluated were left ventricular ejection fractions (LVEF), end-diastolic volumes (EDV), end-systolic volumes (ESV) and stroke volumes (SV).

RESULTS

The correlation between gated SPECT with 201Tl and gated SPECT with 99mTc-sestamibi was: r = 0.93 for LVEF, 0.92 for EDV, 0.96 for ESV and 0.68 for SV.

CONCLUSION

Myocardial gated SPECT quantification of left ventricular function with 201Tl was possible and as reliable as gated SPECT with 99mTc-sestamibi. There was excellent correlation between gated SPECT with 201Tl and gated SPECT with 99mTc-sestamibi. In addition to assessment of myocardial perfusion, myocardial function and viability can be quantified in a single gated 201Tl study.