Patient demographics and electrical data.
One hundred and five patients at 13 investigational sites in Spain and Portugal were prospectively included in the study. The mean age was 65±8 years, and most patients (78, 74%) were men. Baseline characteristics of the study population are summarized in table 1.
Of the 105 subjects who provided consent for study participation, 103 underwent an implant attempt, 1 subject had an unsuccessful implant due to the impossibility to cannulate the coronary sinus, and 102 subjects were successfully implanted with a CRT-D. Figure 1 shows the disposition of subjects during the study. Of the 102 implanted subjects, 96 were programmed with MPP ON. Among these 96 subjects, 30 (31.25%) were programmed following the anatomical approach and 66 (68.75%) following the electrical approach. After 6 months of follow-up there were 2 deaths, 12 patients were withdrawn before or at the 6-month visit. Finally, the 6 months echo follow-up was not performed in 3 patients. Accordingly, 79 patients were programmed with MPP ON, completed the follow-up and had a pair of echocardiographic images available (basal and 6 months). There were 2 subjects who had MPP not working properly during follow-up period and were excluded from the analysis.