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Instantaneous pressure gradient: a simultaneous Doppler and dual catheter correlative study
Journal of the American College of Cardiology
|April 1, 1986
Summary
Continuous wave Doppler echocardiography accurately measures pressure gradients in outflow stenotic lesions. However, maximal Doppler gradients should not be directly equated with peak-to-peak catheter gradients for precise clinical assessment.
Area of Science:
- Cardiology
- Medical Imaging
- Hemodynamics
Background:
- Accurate measurement of pressure gradients across stenotic outflow lesions is crucial for patient management.
- Traditional catheterization provides valuable pressure data but may not capture instantaneous changes effectively.
Purpose of the Study:
- To evaluate the accuracy of simultaneous Doppler and dual catheter pressure gradient measurements.
- To compare beat-to-beat and instantaneous pressure gradient assessments in patients with outflow obstructive lesions.
Main Methods:
- Simultaneous Doppler and dual catheter pressure gradient measurements were performed in 95 patients.
- Data were digitized at 10 ms intervals to derive maximal, mean, and instantaneous gradients.
- Correlation coefficients were calculated for simultaneous and non-simultaneous measurements.
Main Results:
- High correlations were observed between simultaneous Doppler and catheter gradient measurements (r=0.95 for maximal, r=0.94 for mean).
- Maximal Doppler gradients were significantly higher than peak-to-peak catheter gradients, particularly in left ventricular outflow lesions.
- Non-simultaneous Doppler studies showed lower correlation compared to simultaneous measurements.
Conclusions:
- Continuous wave Doppler echocardiography is a reliable tool for assessing instantaneous pressure gradients across ventricular outflow obstructive lesions.
- Care must be taken when interpreting maximal Doppler gradients, as they differ from peak-to-peak catheter gradients.