Heart failure outcomes (Figure 1)
After an average of 18 ± 16 months, average left ventricular ejection fraction improved significantly from pre ablation to post ablation (33 ± 9.3% to 46 ± 16%, p<0.001). The average improvement was significantly greater in those patients with non-ischaemic aetiology (+13 ± 16%) versus those with ischaemic cardiomyopathy (+7.1 ± 14%, p=0.001). Patients demonstrated a significant improvement in average NYHA class at follow up compared to baseline (2.37 ± 0.71 to 1.51 ± 0.66, p<0.001). Only 10% of patients were NYHA class I at baseline compared to 58% at final follow up (p<0.001). There was no difference in single procedure success in patients with LVEF <35% (35%) compared to those with LVEF ≥35% (47%, p=0.38). Twenty-seven (36%) of patients improved LVEF from <35% at baseline to ≥35% at final follow-up whilst 24 patents (32%) had normalised LVEF (>50%) at final follow up.