What is the clinical evidence from this study?

Study design: Other. Population: Stenosis / Hypertrophic cardiomyopathy. Intervention: Doppler ultrasound gradient estimation vs. Invasive catheter measurement. Primary outcome: Pressure gradient measurement.

What question did this study set out to answer?

To determine whether poststenotic pressure recovery accounts for discrepancies between Doppler-derived and invasive catheter-measured intracardiac pressure gradients.

August 18, 2026Journal of the American College of Cardiology167 citationsOpen Access

Pressure recovery distal to a stenosis: Potential cause of gradient “verestimation” by Doppler echocardiography

RLRobert A. LevineCardiac Imaging AJA JimohKogi State University ECEdward G. CapeBoston Children's Hospital

Key Result

In vitro models demonstrate that pressure recovery distal to a stenosis can cause apparent Doppler overestimation of pressure gradients compared to downstream catheter measurements.

Key Points

To determine whether poststenotic pressure recovery accounts for discrepancies between Doppler-derived and invasive catheter-measured intracardiac pressure gradients.
Simulated poststenotic flow dynamics using in vitro models representing central stenoses and streamlined obstruction geometries modeled after hypertrophic cardiomyopathy.
Evaluated velocity reduction, jet expansion, and downstream pressure recovery relative to the vena contracta under physiologic flow rates.
Downstream expansion and deceleration of the poststenotic jet recovered pressure, leading to significantly lower invasive gradient measurements when catheters were placed distal to the vena contracta.
Pressure recovery effects were most pronounced in streamlined tunnel geometries but remained clinically meaningful in central stenoses at physiologic flow rates.
Doppler echocardiography accurately detected the maximal pressure gradient at the vena contracta, which governs the true hemodynamic load on the upstream chamber.

Structured PICO

Does pressure recovery distal to a stenosis cause apparent overestimation of pressure gradients by Doppler echocardiography compared to invasive catheterization?

Population

In vitro models of stenosis, including streamlined tunnels modeled after hypertrophic cardiomyopathy obstruction and central stenoses

Intervention

Doppler echocardiography for pressure gradient estimation

Comparator

Invasive catheter pressure gradient measurement

Outcome

Pressure gradient measurement and the effect of pressure recoverysurrogate

Doppler echocardiography provides the maximal pressure gradient at the vena contracta, which may appear as an overestimation compared to distal catheter measurements due to pressure recovery.

Abstract

Doppler ultrasound is currently being widely applied to measure intracardiac pressure gradients noninvasively. In comparative invasive studies, it is generally assumed that pressure is effectively uniform distal to the stenosis. As the poststenotic jet expands, however, its velocity decreases, and pressure is recovered to the extent permitted by turbulence, so that the measured gradient will be lower if the distal catheter is positioned downstream from the vena contracta. This can lead to apparent Doppler "overestimation" of the pressure gradient because of this phenomenon of pressure recovery. This study demonstrates that pressure recovery can be important in a variety of clinical settings studied by in vitro models. Although most prominent in streamlined tunnels modeled after the obstruction in patients with hypertrophic cardiomyopathy, these effects are important even for central stenoses at physiologic flow rates. Because precise catheter position is not always known or controlled, these findings suggest an important advantage for Doppler gradient estimation, because it provides the maximal gradient at the vena contracta, which determines the load on the proximal chamber.

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