Fractional Flow Reserve (FFR)

Updated: 2026-09-20

Overview

Fractional Flow Reserve (FFR) is a gold-standard physiological assessment tool in interventional cardiology. Developed in the 1990s, it quantifies the hemodynamic impact of coronary artery narrowings by comparing distal coronary pressure to aortic pressure during maximal hyperemia. FFR values ≤0.80 indicate functionally significant lesions requiring revascularization, while values >0.80 suggest deferral of stenting is safe. The technique has become integral to evidence-based PCI decision-making, supported by landmark trials like FAME and FAME 2. Modern FFR systems combine pressure-sensing guidewires with advanced consoles that provide real-time graphical displays and automated calculations, improving procedural efficiency and accuracy.

Key Features

FFR systems feature ultra-thin (0.014-inch) pressure wires with high-fidelity sensors positioned 3cm from the tip. These measure pressure gradients across lesions with <1mmHg drift. Contemporary systems offer automatic temperature compensation, wireless connectivity, and integrated pullback recording for comprehensive lesion assessment. Advanced models incorporate co-registration with angiography (FFRangio) and computational fluid dynamics (FFRct), reducing the need for hyperemic agents. The procedure typically takes 15-30 minutes and is performed under local anesthesia, with adenosine administered intravenously or intracoronary to induce maximal vasodilation.

Application Areas

Primary applications include intermediate coronary lesion evaluation (40-70% stenosis), multivessel disease assessment, and post-PCI result verification. FFR guides treatment decisions in stable CAD, with Class IA recommendation in major guidelines. Emerging uses include graft assessment, serial lesion evaluation, and research applications in coronary physiology. In cath labs, FFR reduces unnecessary stent placements by 30-50%, lowering healthcare costs while improving outcomes. The technology is increasingly combined with intravascular imaging (IVUS/OCT) for comprehensive plaque morphology and functional assessment.

Precautions

Proper FFR use requires understanding several technical aspects. Pressure wire calibration must be performed at table height, with equalization before coronary insertion. Signal drift >3mmHg necessitates re-equalization. Adenosine contraindications include severe asthma, high-grade AV block, and systolic BP <90mmHg. Operators should avoid damping artifacts from guide catheter engagement and recognize pseudonormalization in left main disease. Post-PCI FFR values <0.90 predict higher restenosis rates. Regular system maintenance and staff training are essential for obtaining reliable measurements.

B2B Procurement Guide

Hospitals should evaluate FFR systems based on: 1) Wire compatibility with existing angiography equipment 2) Availability of disposable and reusable components 3) Manufacturer training programs 4) Technical support response times 5) Data integration with hospital IT systems. Leading suppliers offer volume pricing models with bundled disposables. Leasing options are available for lower-volume centers. Procurement teams should verify regulatory approvals (FDA/CE) and review clinical validation studies. Service contracts typically cover 3-5 years with 90% uptime guarantees.