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Pulsed Doppler findings in patients with coarctation of the aorta
Insights
Doppler echocardiography reveals distinct aortic flow patterns in children with coarctation of the aorta. These findings differentiate affected individuals from healthy subjects, aiding in diagnosis.
Area of Science:
- Cardiology
- Pediatric Cardiology
- Medical Imaging
Background:
- Coarctation of the aorta is a congenital heart defect affecting blood flow.
- Accurate diagnosis and assessment are crucial for pediatric patients.
Purpose of the Study:
- To evaluate Doppler echocardiography for characterizing blood flow differences in coarctation of the aorta.
- To compare aortic flow signals between patients with coarctation and healthy children.
Main Methods:
- Combined two-dimensional and pulsed Doppler echocardiography was used.
- 37 infants and children with coarctation and 19 normal subjects were studied.
- Six Doppler flow variables were measured in the ascending and descending aorta.
Main Results:
- Significant differences in acceleration slope, peak systolic frequency, peak velocity, and deceleration slope were observed in the descending aorta of coarctation patients compared to their ascending aorta.
- Acceleration time and antegrade flow time were prolonged in the descending aorta of coarctation patients.
- Aortic flow variables in the descending aorta of coarctation patients differed significantly from those in normal subjects.
Conclusions:
- Doppler echocardiography effectively identifies altered hemodynamic patterns associated with coarctation of the aorta.
- These flow characteristics can distinguish patients with coarctation from healthy individuals, supporting its diagnostic utility.
Abstract:
We used combined two-dimensional and pulsed Doppler echocardiography to examine 37 infants and children with coarctation of the aorta and 19 normal subjects. The ages ranged from 1 day to 16 years. We compared the differences between the Doppler flow signal from the ascending aorta and the descending aorta below the coarctation in each patient, as well as the differences between the corresponding flow signals in the aorta of patients with coarctation and normal subjects. Six variables were measured from each Doppler signal: acceleration slope (peak rate of acceleration), acceleration time (time from onset of flow to the peak systolic frequency), antegrade flow time, peak systolic frequency, peak velocity of flow, and deceleration slope (peak rate of deceleration). In patients with coarctation, each of these variables was significantly different in the descending aorta compared with the ascending aorta. There was a decrease in the acceleration slope (14 +/- 13 vs 87 +/- 67 kHz/sec) (mean +/- SD), peak systolic frequency (1.8 +/- 1.0 vs 5.2 +/- 1.9 kHz), peak velocity of flow (0.70 +/- 0.40 vs 1.4 +/- 0.44 m/sec), and deceleration slope (11 +/- 11 vs 27 +/- 12 kHz/sec). There was also a prolongation of the acceleration time (140 +/- 50 vs 88 +/- 22 msec) and antegrade flow time (330 +/- 120 vs 270 +/- 50 msec). In addition, these variables in the descending aorta of patients with coarctation were significantly different from those in the descending aorta of normal subjects.(ABSTRACT TRUNCATED AT 250 WORDS)