[Evaluation of left ventricular contraction using heart tomography with technetium 99m tetrofosmin in synchrony with ECG. Correlation with bidimensional echocardiography].

BACKGROUND

Echocardiography is a standard method of evaluating segmental and global left ventricular function in clinical practice. The aim of this study was to determine if segmental and global ventricular function determined from Gated SPECT myocardial imaging adequately coincides with echocardiographic data.

PATIENTS AND METHODS

We studied 23 patients with ischemic heart disease referred for clinical 99mTc tetrofosmin Gated SPECT imaging. The results were compared with those obtained using a standard rest echocardiographic assessment. Both studies were performed within a 24-48 hour period. Segmental results in both studies were analyzed by semiquantitative visual scoring using a two or three-point grading system and a summed score was obtained to determine global left ventricular function.

RESULTS

There was a good segmental score agreement between both techniques for wall motion (77.5%; kappa = 0.49) and less for wall thickening (85%; kappa = 0.36). There were non significant statistical differences in the global left ventricular function with both techniques by wall motion (echocardiography 15.3 +/- 5.4 vs tetrofosmin 14.9 +/- 4.4; p = NS) and wall thickening (echocardiography 12.7 +/- 2.3 vs tetrofosmin 12.4 +/- 1.8; p = NS) scores. Correlation for global wall motion (r = 0.81; p < 0.0001) and wall thickening (r = 0.72; p = 0.0001) scores between the two modalities was good.

CONCLUSIONS

Gated SPECT 99mTc tetrofosmin myocardial imaging is a valid method to assess segmental and global left ventricular function and agrees well with echocardiography.