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- W2093066523 abstract "Alterations in the blood radioactivity affect ventricular volume calculations using count-based radionuclide ventriculography. To study this phenomenon, the effect of time, posture and supine exercise on blood radioactivity, red blood cell count and splenic radioactivity was evaluated. The red blood cell count, and blood, splanchnic and splenic radioactivity remained stable in five patients studied at rest in the supine position. On standing, blood radioactivity increased 10 +/- 3% (standard error of the mean), and abdominal radioactivity decreased 14.5 +/- 6.5% (both p less than 0.05). In 10 patients, splenic radioactivity decreased after supine exercise by 49 +/- 7%, while blood radioactivity increased 10.5 +/- 1.5% and red blood cell count increased 7.5 +/- 1.5% (all p less than 0.001). Splenic radioactivity increased gradually after exercise and decreased after a second exercise period. In the exercising patients, blood radioactivity increased by 14.5% and correlated with an increase in the red blood cell count (r = 0.57, p = 0.01, 19 samples from 10 patients). Reduction in splenic radioactivity also correlated with the increase in red blood cell count (r = -0.51, p = 0.025). The data demonstrate splenic shrinkage in human beings and an inverse relation between changes in splenic and blood radioactivity. These dynamic fluctuations emphasize the need for simultaneous blood sampling for accurate calculation of left ventricular volume and high-light the importance of regional volume shifts during exercise." @default.
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- W2093066523 date "1984-05-01" @default.
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- W2093066523 title "Dynamic fluctuations in blood and spleen radioactivity: Splenic contraction and relation to clinical radionuclide volume calculations" @default.
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- W2093066523 doi "https://doi.org/10.1016/s0735-1097(84)80178-3" @default.
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