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82 Rb tissue kinetics in humans.

Sima Gregg1, Georgia Keramida1, A Michael Peters2

  • 1Department of Nuclear Medicine, Royal Brompton and Harefield NHS Foundation Trust, London, UK.

Clinical Physiology and Functional Imaging
|January 28, 2021
PubMed
Summary
This summary is machine-generated.

This study compared rubidium-82 (82Rb) kinetics in the spleen, liver, and kidney. Results show contrasting tissue kinetics, with high extraction efficiency in the kidney and low in the spleen and liver.

Keywords:
82Rbkidneyliverpositron emission tomographyspleen

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Area of Science:

  • Nuclear medicine
  • Radiopharmaceutical kinetics
  • Organ perfusion imaging

Background:

  • Rubidium-82 (82Rb) is a potassium analogue used in myocardial perfusion imaging.
  • Understanding 82Rb kinetics in organs beyond the heart is crucial for interpreting imaging data.
  • Spleen, liver, and kidney exhibit unique physiological characteristics that may influence tracer uptake.

Purpose of the Study:

  • To compare the kinetic behavior of 82Rb in the spleen, liver, and kidney.
  • To evaluate the impact of different vasodilators (adenosine and regadenoson) on organ perfusion and 82Rb extraction.
  • To characterize the relationship between perfusion and tracer extraction efficiency in these organs.

Main Methods:

  • Myocardial stress/rest perfusion imaging with 82Rb was performed in 78 patients using adenosine or regadenoson.
  • Hepatic arterial (HAP), splenic (SP), and renal (RP) perfusions were measured using Gjedde-Patlak-Rutland analysis.
  • Tissue 82Rb extraction efficiency (E) and extracellular fluid volume (ECV) were calculated.

Main Results:

  • Regadenoson increased splenic and renal perfusion, while adenosine decreased them; hepatic perfusion increased with both agents.
  • Resting extraction efficiency (E) was high in the kidney (69%) and low in the spleen (26%) and liver (estimated 23%).
  • Adenosine increased kidney E to 91% and spleen E to 49%; splenic ECV correlated with SP.

Conclusions:

  • Kidney, spleen, and liver demonstrate distinct 82Rb tissue kinetics.
  • The kidney exhibits high 82Rb extraction, while the spleen and liver show lower extraction.
  • The spleen's erectile nature influences its perfusion and volume dynamics.