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and objectives: Phase analysis by Gated-SPECT myocardial perfusion imaging (G-MPI) is a new tool to measure left ventricular dyssynchrony with important clinical applications in near future (heart failure and resynchronization) and can be measured by two software (ECTb o QGS C-S). The aim is to show its feasibility and verify whether there is difference between the programs. Methodology: Analytical observational and retrospective study in patients with normal G-MPI. The parameters were the phase standard deviation (SD) and the histogram bandwidth (HB) in post-stress and rest tests. Assessment of the difference between groups was performed using tests for independent samples after analyze the distribution of data. The significance level (p) was 0,05 and the software used was SPSS IBM V.21® Results: Total:193 patients (104 men).64 years old ± (24-89).61/193 processed with QGS C-S and 132/193 with ECTb. Post-stress tests: mean of the SD was 6o±3.7o,the median was 5o,interquartile range (IR):3.6o. The mean of HB was 22.7o±10o and the median was 18o IR:11.5o. Post-rest tests: mean of the SD was 5.76o±4.82o and median was 4.5o IR: 3.1o.The overall mean of HB was 21.67o±14.06o and median was 18o IR: 12o. Between the data from both software, significant differences were found in SD in poststress(p=0.001)and post-rest tests(p=0.019)and no significant differences were found in HB in post-stress(p= 0.31)or post-rest tests(p=0.18). Conclusion: Phase analysis by G-MPI is feasible. However SD showed significant differences between the two groups. Although the values showed could be used as normal values, it is recommended that these have to be obtained and used for each software separately.

Phase analysis to measure left ventricular dyssynchrony by Gated-SPECT myocardial perfusion imaging showed by two different software