Calculates the diastolic pulmonary gradient from diastolic pulmonary artery and wedge pressures. This guide explains the method, appropriate use, interpretation and limitations.
Overview
Calculates the diastolic pulmonary gradient from diastolic pulmonary artery and wedge pressures.
Clinical Significance
DPG may contribute to haemodynamic phenotyping but is sensitive to measurement error and should not be used in isolation.
When to Use
- Use when the stated clinical calculation is relevant to the patient and decision being considered.
- Use contemporaneous measurements obtained with appropriate technique.
- Confirm that the equation and units match local practice before acting on the result.
How It Is Calculated
- DPG = diastolic pulmonary artery pressure − pulmonary capillary wedge pressure.
Interpretation
- DPG may contribute to haemodynamic phenotyping but is sensitive to measurement error and should not be used in isolation.
- Interpret trends and the full clinical picture rather than relying on a single calculated value.
Worked Example
Enter a valid set of the required measurements. MedicalC applies: DPG = diastolic pulmonary artery pressure − pulmonary capillary wedge pressure. The displayed result should then be checked against the clinical context and local guidance.
Patient Considerations
- Consider whether physiology, treatment or sampling conditions changed between measurements.
- Consider whether the patient differs from the population in which the equation is normally used.
Limitations
- The result is only as reliable as the entered measurements and assumptions behind the equation.
- The calculator does not replace clinical assessment, definitive measurement or specialist advice.
- Thresholds and interpretation may vary between populations, laboratories and clinical pathways.
Clinical Pearls
- Confirm units before calculation.
- Use values obtained at the same clinical time point.
- Document the component measurements with the calculated result.
Common Mistakes
- Mixing SI and conventional units.
- Using estimated or non-contemporaneous measurements without acknowledging uncertainty.
- Treating a calculated value as a diagnosis or treatment instruction.
Evidence Base
The implemented equation follows the established published or guideline-based relationship: DPG = diastolic pulmonary artery pressure − pulmonary capillary wedge pressure.
Frequently Asked Questions
What does the Diastolic Pulmonary Gradient calculator do?
Calculates the diastolic pulmonary gradient from diastolic pulmonary artery and wedge pressures.
Can the result be used alone?
No. It should support, not replace, clinical assessment and current guidance.
Why might the result be unreliable?
Incorrect units, poor measurement quality, non-contemporaneous inputs or use outside the intended setting can produce misleading results.
Should the calculation be repeated?
Repeat it when relevant measurements or the patient’s clinical condition change.
References
- 2022 ESC/ERS Guidelines for pulmonary hypertension. — Primary publication, guideline or established physiologic source supporting the equation.
Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026