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Estimation of right ventricular pressure in children by thallium-201 myocardial imaging using single-photon emission
T Akiba1, M Yoshikawa, S Otaki
1Department of Pediatrics, Yamagata University School of Medicine, Japan.
Insights
This study shows that Thallium-201 myocardial imaging can accurately estimate right ventricular (RV) systolic pressure in children. This noninvasive method provides reliable RV pressure measurements, aiding in pediatric cardiac assessments.
Area of Science:
- Pediatric Cardiology
- Nuclear Cardiology
- Cardiovascular Imaging
Background:
- Estimating right ventricular (RV) systolic pressure in children is crucial for diagnosing and managing various cardiac conditions.
- Noninvasive methods are preferred to minimize risks associated with cardiac catheterization in pediatric patients.
Purpose of the Study:
- To evaluate the efficacy of Thallium-201 myocardial imaging using single-photon emission computed tomography (SPECT) for noninvasively estimating RV systolic pressure in children.
- To establish a correlation between quantitative SPECT findings and invasively measured RV pressures.
Main Methods:
- Thirty-four children underwent Thallium-201 SPECT imaging.
- Regions of interest were defined over the RV and left ventricular (LV) free walls to measure Thallium-201 counts.
- The ratio of RV-to-LV peak Thallium-201 counts was compared with RV peak systolic pressure obtained via cardiac catheterization.
Main Results:
- A strong correlation was observed between the RV-to-LV peak Thallium-201 counts ratio and both RV peak systolic pressure (r=0.95) and the ratio of RV-to-LV peak systolic pressure (r=0.96).
- A RV-to-LV peak Thallium-201 counts ratio >= 0.45 demonstrated high accuracy in predicting RV pressure overloading (sensitivity 92%, specificity 88%).
Conclusions:
- Quantitative analysis of Thallium-201 SPECT imaging allows for accurate and noninvasive estimation of RV systolic pressure in pediatric populations.
- This imaging technique offers a valuable tool for assessing RV pressure and identifying RV pressure overloading in children, potentially reducing the need for invasive procedures.
Abstract:
Thallium-201 myocardial imaging using single-photon emission computed tomography was performed to estimate right ventricular (RV) systolic pressure in 34 children (aged 4.1 to 16.1 years, mean 7.9 +/- 2.9). Acquisition of the images was performed using a semicircular arc of 180 degrees. On a short-axis slice, a line drawn perpendicular to the ventricular septum so as to cross the RV free wall showing maximum uptake was defined as the region of interest. Thallium-201 counts in regions of interest over both RV and left ventricular (LV) free walls were measured. The ratio of RV-to-LV peak thallium-201 counts was compared with RV peak systolic pressure and the ratio of RV-to-LV peak systolic pressure measured at cardiac catheterization. Both RV peak systolic pressure and the ratio of RV-to-LV peak systolic pressure correlated well with the ratio of RV-to-LV peak thallium-201 counts (r = 0.95 and 0.96, respectively). The ratio of RV-to-LV peak thallium-201 counts greater than or equal to 0.45 could predict RV pressure overloading with a sensitivity of 92%, and a specificity of 88%. Thus, the quantitative analysis of thallium-201 myocardial imaging using single-photon emission computed tomography permits the noninvasive and accurate estimation of RV systolic pressure in children.