Pulmonary Artery Pulsatility Index Calculator

PAPI Formula:

\[ PAPI = \frac{sPAP - dPAP}{RAP} \]

Systolic Pulmonary Artery Pressure (sPAP):

mmHg

Diastolic Pulmonary Artery Pressure (dPAP):

mmHg

Right Atrial Pressure (RAP):

mmHg

Pulmonary Artery Pulsatility Index (PAPI):

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1. What is Pulmonary Artery Pulsatility Index?

The Pulmonary Artery Pulsatility Index (PAPI) is a hemodynamic parameter used to assess right ventricular function. It is calculated using systolic and diastolic pulmonary artery pressures along with right atrial pressure.

2. How Does the Calculator Work?

The calculator uses the PAPI formula:

\[ PAPI = \frac{sPAP - dPAP}{RAP} \]

Where:

\( sPAP \) — Systolic Pulmonary Artery Pressure (mmHg)
\( dPAP \) — Diastolic Pulmonary Artery Pressure (mmHg)
\( RAP \) — Right Atrial Pressure (mmHg)

Explanation: The equation calculates the pulsatility index by dividing the pulmonary artery pulse pressure by the right atrial pressure.

3. Importance of PAPI Calculation

Details: PAPI is an important prognostic marker in patients with pulmonary hypertension and heart failure. Lower PAPI values are associated with worse right ventricular function and poorer outcomes.

4. Using the Calculator

Tips: Enter all pressure values in mmHg. All values must be valid (greater than 0). Ensure measurements are taken under consistent conditions for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is a normal PAPI value?
A: Normal PAPI values typically range from 2.0-3.0, though this can vary based on individual patient characteristics and measurement conditions.

Q2: When is PAPI most clinically useful?
A: PAPI is particularly useful in assessing right ventricular function in patients with pulmonary hypertension, heart failure, and following cardiac surgery.

Q3: How is PAPI different from other right ventricular function indices?
A: PAPI provides a composite measure that incorporates both pulmonary artery pressures and right atrial pressure, offering a more comprehensive assessment of right ventricular-pulmonary arterial coupling.

Q4: Are there limitations to PAPI measurement?
A: PAPI requires invasive hemodynamic monitoring and may be influenced by volume status, respiratory variations, and technical measurement factors.

Q5: Can PAPI be used to guide treatment decisions?
A: PAPI can be a useful adjunct in clinical decision-making, particularly in managing patients with right heart failure and pulmonary hypertension, but should be interpreted in the context of other clinical findings.