Background: The aetiology of heart failure may have different effects on right ventricular (RV) function, pulmonary pressures and RV afterload. Pulmonary arterial capacitance (PAC) and pulmonary artery pulsatility index (PAPi) are novel haemodynamic indices used in determining RV afterload and RV function, respectively. We aimed to investigate whether there was a difference in PAC and PAPi between ischaemic cardiomyopathy (ICMP) and non-ischaemic cardiomyopathy (NICMP) in patients with end-stage heart failure.
Methods and results: A total of 215 subjects undergoing evaluation for heart transplantation or left ventricular (LV) assist device were classified into two groups: ICMP (n = 101) and NICMP (n = 114). The patients with LV ejection fraction ≤ 25% were included in the study. ICMP group had lower PAC and higher PAPi values compared to NICMP group [1.25 (0.82-1.86) vs. 1.58 (1.02-2.21), p = 0.002 and 3.4 (2.2-5.0) vs. 2.5 (1.7-4.0); p = 0.007]. Pulmonary vascular resistance, pulmonary artery systolic and mean pressure were higher in ICMP group compared to NICMP group [3.5 ± 1.8 vs. 2.9 ± 2.3, p = 0.004; 59.0 (42.0-73.0) vs. 46.0 (37.0-59.0), p < 0.001, 35.0 (27.0-46.0) vs. 31.0 (23.0-39.0), p = 0.002]. The patients with ICMP had higher tricuspid annular plane systolic excursion and less RV dilatation. ICMP was an independent risk factor for pulmonary hypertension (OR: 4.02, 95% CI: 1.13-14.24, p = 0.031).
Conclusion: ICMP was associated with lower PAC and higher PAPi. These results indicated that an ischaemic aetiology is associated with higher RV afterload and better RV function in the end-stage heart failure.
Keywords: Heart failure; ischaemic cardiomyopathy; non-ischaemic cardiomyopathy; pulmonary artery capacitance; pulmonary artery pulsatility index; right ventricular function.