ABC-AF Bleeding Score ABC-AF Stroke Score ABCD2 Score ADD-RS Aortic Valve Calcium Score APPLE Score ASCVD (Pooled Cohort)AVA (Continuity Equation)BAG-AHF Score Biplane Simpson EF Blood Pressure Percentiles Brugada Criteria (VT vs SVT)Cardiac Output Index CHA2DS2-VASc CHADS2 Cornell Voltage Criteria CRUSADE Bleeding Score DAPT Score DASI Duke Treadmill Score E/A Ratio EDACS Score EHMRG EHRA Score Embolic Risk Score EROA (PISA Method)FFR (Fractional Flow Reserve)Fick Cardiac Output Framingham 10-Year Risk Friedewald LDL Equation Gorlin Equation GRACE Score Gupta MICA (NSQIP)GWTG-HF Score H2FPEF Score Hakki Formula HAS-BLED HEART Pathway HEART Score HEMORR2HAGES hs-Troponin 0h/1h ESC Algorithm iFR INTERCHEST Score Killip Classification Lee's RCRI LV Mass Index LV Stroke Work Index MAGGIC Risk Score MAP Calculator Martin/Hopkins LDL Modified Duke Criteria Modified Sgarbossa Criteria MVA (Pressure Half-Time)Non-HDL Cholesterol NT-proBNP Age-Adjusted Thresholds ORBIT Score Ottawa Heart Failure Risk PREVENT Equations Pulse Pressure PVR Calculator PVR Index QRISK3 QTc (Bazett)QTc (Fridericia)REVEAL 2.0 Score REVEAL Lite 2 Reynolds Risk Score ROSI RVSP Calculator Schwartz Score (LQTS)SCORE2 Seattle Heart Failure Model (SHFM)Sgarbossa Criteria Shock Index Sokolow-Lyon Voltage Stroke Volume Index SVR Calculator SYNTAX Score SYNTAX Score II TAPSE Teichholz Formula TIMI (STEMI)TIMI (UA/NSTEMI)Troponin Delta Calculator Valvular Gradients Vancouver Chest Pain Rule Vereckei Algorithm WATCHDM Score Wilkins Score Wood Units Calculator

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FFR (Fractional Flow Reserve)

FFR (Fractional Flow Reserve): Pressure-wire derived index to assess functional significance of coronary lesions.

Pressure Measurements (at maximal hyperaemia)

Distal Coronary Pressure — Pd (mmHg)

Aortic Pressure — Pa (mmHg)

Formula

FFR = Pd / Pa

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Functional assessment of coronary lesion severity during angiography

Decision-making: proceed with PCI vs. defer in intermediate stenosis

Multivessel disease triage (defer non-culprit lesions if FFR >0.80)

Guidance for staged revascularization strategy

≥50% but <90% angiographic stenosis requiring physiologic assessment

Key Points

FFR 0.75–0.80: borderline lesions benefit from serial assessment or iFR

FFR-guided PCI reduces MACE vs. angiography-only guided strategy

ESC/AHA recommend FFR for intermediate coronary lesions

Requires adenosine hyperaemia or equivalent stress; adenosine-free alternatives (iFR, RFR) emerging

Last Comprehensive Review: 2026

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Functional assessment of coronary lesion severity during angiography

Decision-making: proceed with PCI vs. defer in intermediate stenosis

Multivessel disease triage (defer non-culprit lesions if FFR >0.80)

Guidance for staged revascularization strategy

≥50% but <90% angiographic stenosis requiring physiologic assessment

Key Points

FFR 0.75–0.80: borderline lesions benefit from serial assessment or iFR

FFR-guided PCI reduces MACE vs. angiography-only guided strategy

ESC/AHA recommend FFR for intermediate coronary lesions

Requires adenosine hyperaemia or equivalent stress; adenosine-free alternatives (iFR, RFR) emerging

Last Comprehensive Review: 2026

Related Cardiovascular Tools

Ottawa Heart Failure Risk

Embolic Risk Score

Sokolow-Lyon Voltage

ABCD2 Score

Cardiovascular Calculators Critical Care Calculators Emergency Medicine Calculators

Have feedback about this calculator?Let us know.

In Recent Clinical News

Scanning Medical Journals

No new significant updates or guidelines matching this topic were found today. We will check again soon.

FFR (Fractional Flow Reserve)

FFR (Fractional Flow Reserve): Pressure-wire derived index to assess functional significance of coronary lesions.

Pressure Measurements (at maximal hyperaemia)

Distal Coronary Pressure — Pd (mmHg)

Aortic Pressure — Pa (mmHg)

Formula

FFR = Pd / Pa

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Functional assessment of coronary lesion severity during angiography

Decision-making: proceed with PCI vs. defer in intermediate stenosis

Multivessel disease triage (defer non-culprit lesions if FFR >0.80)

Guidance for staged revascularization strategy

≥50% but <90% angiographic stenosis requiring physiologic assessment

Key Points

FFR 0.75–0.80: borderline lesions benefit from serial assessment or iFR

FFR-guided PCI reduces MACE vs. angiography-only guided strategy

ESC/AHA recommend FFR for intermediate coronary lesions

Requires adenosine hyperaemia or equivalent stress; adenosine-free alternatives (iFR, RFR) emerging

Last Comprehensive Review: 2026

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Functional assessment of coronary lesion severity during angiography

Decision-making: proceed with PCI vs. defer in intermediate stenosis

Multivessel disease triage (defer non-culprit lesions if FFR >0.80)

Guidance for staged revascularization strategy

≥50% but <90% angiographic stenosis requiring physiologic assessment

Key Points

FFR 0.75–0.80: borderline lesions benefit from serial assessment or iFR

FFR-guided PCI reduces MACE vs. angiography-only guided strategy

ESC/AHA recommend FFR for intermediate coronary lesions

Requires adenosine hyperaemia or equivalent stress; adenosine-free alternatives (iFR, RFR) emerging

Last Comprehensive Review: 2026

Related Cardiovascular Tools

Ottawa Heart Failure Risk

Embolic Risk Score

Sokolow-Lyon Voltage

ABCD2 Score

Cardiovascular Calculators Critical Care Calculators Emergency Medicine Calculators

Have feedback about this calculator?Let us know.