"overestimation" of catheter gradients by doppler ultrasound in patients with aortic stenosis: a predictable manifestation of pressure recovery
Helmut Baumgartner, MD, FACCa,
Thomas Stefenelli, MD, FACCa,
Julia Niederberger, MDa,
Heinrich Schima, PhD* and
Gerald Maurer, MD, FACCa
a Department of Cardiology, Vienna General Hospital, University of Vienna, Vienna, Austria
* Center of Biomedical Research/Ludwig Boltzmann Research Institute of Cardiac Surgery, Vienna General Hospital, University of Vienna, Vienna, Austria
View larger version (20K):
[in a new window]
|
Figure 1 Differences between peak Doppler and peak catheter gradients versus average peak gradient by Doppler and catheter technique. Mean difference ±2 SD are represented by the dashed lines. Data of patients with a diameter of the ascending aorta  3 cm are indicated by filled circles, whereas open circles represent data from patients with a diameter of the aorta >3 cm.
|
|
View larger version (20K):
[in a new window]
|
Figure 2 Differences between mean Doppler and mean catheter gradients versus average mean gradient by Doppler and catheter technique. Mean difference ±2 SD are represented by the dashed lines. Data of patients with a diameter of the ascending aorta 3 cm are indicated by filled circles, whereas open cicles represent data from patients with a diameter of the aorta >3 cm.
|
|
View larger version (20K):
[in a new window]
|
Figure 3 Differences between Doppler predicted (i.e., pressure recovery) and observed Doppler-catheter gradient differences (peak gradient) versus average peak gradient differences by prediction and observation. Mean difference ±2 SD are indicated by the dashed lines.
|
|
View larger version (20K):
[in a new window]
|
Figure 4 Differences between Doppler predicted (i.e., pressure recovery) and observed Doppler-catheter gradient differences (mean gradient) versus average mean gradient differences by prediction and observation. Mean difference ±2 SD are indicated by the dashed lines.
|
|
View larger version (31K):
[in a new window]
|
Figure 5 Peak Doppler gradients (open circles) and Doppler predicted peak catheter gradients (filled circles) versus observed peak catheter gradients (dashed line = line of identity).
|
|
View larger version (32K):
[in a new window]
|
Figure 6 Mean Doppler gradients (open circles) and Doppler predicted mean catheter gradients (filled circles) versus mean catheter gradients (dashed line = line of identity).
|
|
|
