[Quantitative analysis of right ventricular overloading by 201Tl myocardial SPECT].
Clinical usefulness of quantitative analysis of right ventricular overloading was evaluated by 201Tl myocardial SPECT in comparison with cardiac catheterization and MRI. Seventy-four MBq of 201TlCl was intravenous injected and 201Tl myocardial SPECT was performed on 40 patients (mean age: 61.0 +/- 11.8) with right ventricular overloading. Regions of interest (ROI) were selected on right and left ventricular walls in a midventricular short axis image of SPECT and uptake of each ROI were counted. The right ventricle (RV)/left ventricle (LV) 201Tl uptake ratio (R/L-Tl) was calculated. Wall thickness of RV and LV were measured on MRI and the RV/LV wall thickness ratio (R/L-WT) was calculated. RV and LV pressure were recorded in cardiac catheterization, and the RV/LV systolic pressure ratio (R/L-P) was calculated. There was significant positive correlation (Y = 0.73X + 0.19, r = 0.71, p < 0.001) between R/L-Tl and R/L-WT. R/L-Tl was positively correlated with R/L-P in patients with pressure overload (Y = 1.14X - 0.049, r = 0.85, p < 0.001) and in patients with volume overload (Y = 0.51X + 0.023, r = 0.88, p < 0.001) and the slope of the regression line in patients with pressure overload was significantly steeper than that in patients with volume overload (p < 0.001). In conclusion, quantitative analysis of right ventricular overload by 201Tl myocardial SPECT is useful to estimate RV/LV wall thickness ratio and pressure ratio.
Taniguchi
Y
Y
Second Department of Medicine, Kyoto Prefectural University of Medicine.
Miyao
K
K
Shima
M
M
Kitamura
M
M
Tsuji
H
H
Shudo
T
T
Sugihara
H
H
Nakagawa
M
M
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006328:Cardiac Catheterization; D002318:Cardiovascular Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology; D005069:Evaluation Studies as Topic; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D013599:Systole; D013794:Thallium Radioisotopes; D015899:Tomography, Emission-Computed, Single-Photon; D016278:Ventricular Function, Right
D013794:Thallium Radioisotopes