The reasons why fractional flow reserve and instantaneous wave-free ratio are similar using wave separation analysis

Table 2 Pressures (mmHg) at proximal and distal site at rest and hyperemia, and indices obtained from eleven coronary vessels in this study

Patients	Vessels	FFR	iFR	P_a	P_d	P_a	P_d	P_for (distal)	P_back (distal)	P_for (distal)	P_back (distal)	Reconstructed FFR	Reconstructed iFR
Patients	Vessels	FFR	iFR	Resting		Hyperemia		Resting		Hyperemia		Reconstructed FFR	Reconstructed iFR
1	LAD	0.75	0.92	74.9	69.1	63.4	49.8	48.1	21	40.2	9.6	0.75	0.89
2	LAD	0.8	0.94	88.1	83.1	77.7	63.8	57.8	25.3	57.1	6.7	0.80	0.92
3	LAD	0.85	0.89	120.4	113.8	103.6	93.3	80.8	33	78.2	15.1	0.88	0.93
4	LAD	0.87	0.97	126.6	119.3	106.9	96.1	73.5	45.8	68.5	27.6	0.86	0.91
4	LCx	0.96	1.04	119.8	119.8	109.5	106.8	84.9	37.9	90	16.9	0.97	1.00
4	RCA	0.96	1.07	123.4	128.3	94.7	107.1	88.6	39.7	79.3	27.8	0.97	1.06
5	Ramus	0.94	0.99	102.5	101.3	109.5	90.8	60.2	40.1	70.3	20.5	0.95	0.98
6	LAD	0.73	0.82	109.7	96.0	100.8	80.2	70.3	25.7	68.6	11.6	0.70	0.84
7	LAD	0.8	0.98	108.8	104.5	80.9	87.2	62.4	42.1	59.2	28	0.81	0.94
8	LAD	0.66	0.74	88.1	67.6	80.9	57.4	39.6	28	45.2	12.2	0.66	0.66
9	LAD	0.89	1.07	105.7	108.3	98.8	90.3	63.7	44.6	75.1	15.2	0.90	1.04

FFR, fractional flow reserve; iFR, instantaneous wave-free ratio; P_a, coronary aortic pressure; P_d, coronary distal pressure; P_back, backward pressure; P_for, forward pressure

ISSN: 1471-2261