Fractional Flow Reserve (FFR) Calculator

Fractional Flow Reserve Calculator — Calculate Coronary Artery Pressure Ratio

Calculate Fractional Flow Reserve to assess the severity of coronary artery stenosis. FFR is the ratio of maximal blood flow in a stenotic coronary artery to normal maximal flow.

Step 1: Pressure Measurements

Aortic Pressure (Pa) – mmHg

Distal Coronary Pressure (Pd) – mmHg

80 mmHg

Central Venous Pressure (Pv) – mmHg

5 mmHg

Understanding FFR Measurements

FFR = (Pd – Pv) / (Pa – Pv). Normal FFR is ≥0.80. Values below 0.75 indicate hemodynamically significant stenosis that may require intervention.

Step 2: Clinical Parameters

Stenosis Location

Visual Stenosis Severity (%)

50%

Assume maximal hyperemia (adenosine)

Show clinical interpretation

Show pressure visualization

About Fractional Flow Reserve

FFR is a lesion-specific index of the functional severity of coronary stenosis. It is measured during coronary angiography and helps guide revascularization decisions.

FFR Calculation Results

FFR Summary

Clinical Scenarios

Interpretation

Calculated Fractional Flow Reserve

0.79

Pd: 80 mmHg, Pa: 100 mmHg, Pv: 5 mmHg

Normal (FFR ≥ 0.80)

Borderline (0.75-0.80)

Abnormal (FFR ≤ 0.75)

Aortic Pressure (Pa)

100 mmHg

Distal Pressure (Pd)

80 mmHg

Venous Pressure (Pv)

5 mmHg

Pressure Gradient

20 mmHg

Clinical Interpretation

Based on an FFR of 0.79, this represents a borderline result. Clinical correlation with symptoms and non-invasive testing is recommended. Consider intravascular imaging for further assessment.

FFR Clinical Scenario Comparison

Clinical Scenario	Typical FFR	Interpretation	Recommended Action

FFR Severity Breakdown

FFR Calculation Formula

FFR = (Pd – Pv) / (Pa – Pv)

Where:
• Pd = distal coronary pressure (mmHg)
• Pa = aortic pressure (mmHg)
• Pv = central venous pressure (mmHg)
FFR values range from 0 to 1, with normal coronary arteries having FFR values close to 1.0.

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