Why the study?
It was unknown whether phase analysis imaging could predict treatment response and long-term prognosis after cardiac resynchronization therapy.
Does discordant LV pacing lead location increase the risk of major adverse cardiac events in patients undergoing cardiac resynchronization therapy?
Cohort (n=69)
Does discordant LV pacing lead location increase the risk of major adverse cardiac events in patients undergoing cardiac resynchronization therapy?
Hazard Ratio: 3.29 (95% CI 1.25–8.72)
p-value: p=0.016
Guiding left ventricular lead placement with phase analysis of myocardial perfusion imaging can improve long-term prognosis and CRT response, particularly in patients with non-ischemic cardiomyopathy.
Discordant LV lead location was associated with higher MACE risk only in non-ischemic cardiomyopathy; hypothesis-generating for phase analysis-guided CRT placement.
Aims To evaluate whether phase analysis imaging may predict treatment response and long-term prognosis after cardiac resynchronization therapy (CRT). Methods and results Sixty-nine patients underwent myocardial perfusion imaging followed by CRT. Patients with ischaemic heart disease and non-ischaemic cardiomyopathy (NICM) were identified. Left ventricular (LV) mechanical dyssynchrony (LVMD) was assessed at phase analysis and the region of the latest mechanical activation was identified. LV pacing lead position was considered ‘concordant’ when located in the region of the latest mechanical activation, and ‘discordant’ otherwise. The ‘6 months post-CRT’/‘baseline’ ratio of LV ejection fraction was computed as a measure of CRT response. LVMD was revealed in 47/69 patients, 27 of whom (57%) had a concordant LV lead implantation. Only concordant pacing was associated with LV functional improvement (ejection fraction ratio: 1.28 ± 0.25 vs. 1.11 ± 0.32 in discordant stimulation, P = 0.028). However, this relationship persisted only in patients with NICM (P < 0.001), while it disappeared in those with ischaemic heart disease (P = NS). Twenty-eight events occurred during 30 ± 21 months follow-up. While discordant LV lead location was the major predictor of unfavourable prognosis (hazard ratio 3.29, 95% confidence interval 1.25–8.72; P = 0.016), this relationship was confirmed only in patients with NICM. Conclusions Phase analysis of myocardial perfusion imaging may guide CRT implantation, identifying patients who would most likely benefit from this procedure.
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Liga et al. (2023) conducted a cohort in Heart failure undergoing cardiac resynchronization therapy (CRT) (n=69). Discordant left ventricular pacing lead location vs. Concordant left ventricular pacing lead location (located in the region of the latest mechanical activation) was evaluated on Major adverse cardiac events (MACE), comprising cardiac death, acute coronary syndrome, and urgent hospitalization for cardiac causes (HR 3.29, 95% CI 1.25-8.72, p=0.016).
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