Rate Pressure Products Affect the Relationship between the Fractional Flow Reserve and Instantaneous Wave-Free Ratio

Table 3

The variables associated with the FFR and iFR.

	FFR				iFR
	Univariable		Multivariable		Univariable		Multivariable
	β	value	β	value	β	value	β	value
Age	0.04	0.52			−0.15	0.02	−0.01	0.87
Female	−0.1	0.11	−0.1	0.12	0.03	0.59
Body mass index	−0.07	0.25			0.02	0.77
Diabetes mellitus	0.13	0.04	0.13	0.04	0.24	<0.0001	0.23	0.002
Hypertension	0.005	0.94			0.02	0.7
Dyslipidemia	0.03	0.61			−0.07	0.24
Smoking	0.07	0.28			−0.05	0.47
Prior myocardial infarction	−0.04	0.50			0.02	0.77
Prior revascularization	−0.07	0.29			−0.12	0.05	−0.1	0.21
LVEF	0.02	0.79			0.04	0.52
LVMI	−0.04	0.60			−0.1	0.19	−0.06	0.49
E/e′	−0.07	0.35			−0.18	0.01	−0.05	0.58
GFR	0.08	0.21			0.16	0.01	0.13	0.13
Rate pressure products	−0.001	0.99			−0.14	0.03	−0.15	0.04

LVEF, left ventricular ejection fraction; LVMI, left ventricular mass index; GFR, glomerular filtration rate; FFR, fractional flow reserve; iFR, instantaneous wave-free ratio.