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Radioangioscintigraphy and Doppler echocardiography in the quantification of left-to-right shunt
1Department of Pediatric Cardiology, Medical School Zagreb, Clinical Hospital Centre Rebro, Kispaticeva 12, 10000 Zagreb, Croatia.
Insights
Doppler echocardiography accurately estimates left-to-right shunts in children with congenital heart disease, showing minimal differences compared to radionuclide methods. This non-invasive technique is reliable for assessing atrial septal defects and ventricular septal defects.
Area of Science:
- Pediatric Cardiology
- Diagnostic Imaging
- Congenital Heart Disease
Background:
- Left-to-right shunts are common in congenital heart disease (CHD).
- Accurate quantification of shunt magnitude is crucial for clinical management.
- Traditional methods like radionuclide quantification have limitations.
Purpose of the Study:
- To compare the accuracy of Doppler echocardiography with radionuclide quantification for estimating left-to-right shunt magnitude in children with isolated CHD.
- To evaluate the clinical utility of Doppler echocardiography in assessing atrial septal defects (ASD) and ventricular septal defects (VSD).
Main Methods:
- Study included 55 children with isolated ASD or VSD.
- Left-to-right shunt magnitude was measured using both radionuclide quantification and Doppler echocardiography.
- Doppler echocardiography formula: flow (L/min) = mean velocity x area x ejection time x heart rate.
Main Results:
- Little difference was found between Doppler echocardiography and radioangioscintigraphy for the whole group (N=55).
- Subgroup analysis for ASD (n=24) and VSD (n=31) also showed comparable results.
- The range of differences was within acceptable limits for clinical use.
Conclusions:
- Doppler echocardiography is a sufficiently accurate method for clinical estimation of the Q(p)/Q(s) ratio in isolated congenital heart disease with left-to-right shunt.
- This finding supports the use of Doppler echocardiography as a primary non-invasive tool for shunt assessment in pediatric cardiology.
- The study validates Doppler echocardiography as a reliable alternative to radioangioscintigraphy.
Abstract:
The magnitude of left-to-right shunt in 55 children with isolated congenital heart disease [atrial septal defect (ASD) or ventricular septal defect (VSD) (muscular and perimembranous)] was estimated by two methods: radionuclide quantification and Doppler echocardiography [flow (L/min) = mean velocity x area x ejection time x heart rate]. We found little difference between the magnitude of left-to-right shunt obtained with Doppler echocardiography and that with radioangioscintigraphy for a whole group of patients (N = 55, -11.42% to 12.04%) and for subgroups of ASD (n = 24, -12.49% to 12.19%) and VSD (n = 31, -10.69% to 12.23%). These results indicate that Doppler echocardiography, in comparison with radioangioscintigraphy, is sufficiently accurate for clinical estimation of the Q(p)/Q(s) ratio in isolated congenital heart disease with left-to-right shunt.