[Whole body distribution of Tc-99m-sestamibi after pharmacological stress with arbutamine and dipyridamole compared with resting conditions].
OBJECTIVE
Arbutamine is a new catecholamine that has been developed as a pharmacologic stress agent for the diagnosis of coronary artery disease. Optionally, it can be used in myocardial scintigraphy. The pharmacologic effect compared to dipyridamole was assessed looking at the whole body distribution of Tc-99m-Sestamibi.


METHODS
9 patients were investigated after injection of Tc-99m-Sestamibi during rest, after infusion of arbutamine, and after vasodilatation with dipyridamole.


RESULTS
Infusion of arbutamine results in a measurable diminished radiotracer deposition in the lower limb as compared to dipyridamole. The amount of myocardial activity of Tc-99m-sestamibi, however, is also reduced as shown by the percentage of myocardial activity compared to the whole body distribution (2.5% +/- 0.4% for arbutamine vs. 2.8% = 0.5% for dipyridamole) in addition, the heart/lung ratio is lower after application of arbutamine (12.1% +/- 0.5% vs. 2.4% +/- 0.4%).


CONCLUSIONS
After infusion of arbutamine the percentage of myocardial activity as well as the contrast of the myocardium to the surrounding lungs is decreased as compared to dipyridamole. Further studies should reveal whether this difference is relevant in diagnosing coronary artery disease.
Kotzerke
J
J
Abteilung Nuklearmedizin, Universität Ulm, Deutschland.
Bergmann
K
K
Glatz
S
S
Höher
M
M
Reske
S N
SN
D000318:Adrenergic beta-Agonists; D000328:Adult; D000368:Aged; D001794:Blood Pressure / Q000187:drug effects; D002395:Catecholamines; D003327:Coronary Disease / Q000000981:diagnostic imaging* / Q000503:physiopathology; D004176:Dipyridamole; D005080:Exercise Test; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000000981:diagnostic imaging* / Q000503:physiopathology; D012146:Rest; D017256:Technetium Tc 99m Sestamibi / Q000493:pharmacokinetics*; D014018:Tissue Distribution; D015899:Tomography, Emission-Computed, Single-Photon; D014665:Vasodilator Agents
D000318:Adrenergic beta-Agonists; D002395:Catecholamines; D014665:Vasodilator Agents; D004176:Dipyridamole; D017256:Technetium Tc 99m Sestamibi; C076559:arbutamine
Ganzkörperverteilung von Tc-99m-Sestamibi nach pharmakologischer Belastung mit Arbutamin und Dipyridamol im Vergleich zum Ruhezustand.