A new method for monitoring the cerebrovascular response to acetazolamide using 99mTc-DTPA-HSA.
We developed a new method for monitoring the cerebrovascular response to acetazolamide using technetium-99m diethylenetriaminepentaacetic acid human serum albumin (99mTc-DTPA-HSA). We infused 740 M Bq (20 mCi) of 99mTc-DTPA-HSA intravenously and carried out dynamic scanning of the anterior view of the head for 50 minutes. Ten minutes after the start of scanning, 1,000 mg of acetazolamide was injected intravenously. In three normal volunteers, the radioactivity in brain increased for an average of 8 minutes after the injection of acetazolamide and then remained relatively stable. The average of dilatation index [(peak count/the count just before acetazolamide injection-1)x 100] was 16.1. Our method enabled us to observe vasodilation caused by acetazolamide straight, and may be of value in assessing cerebral perfusion reserve easily and quantitatively.
Inoue
Y
Y
Department of Radiology, Saitama Medical Center, Japan.
Momose
T
T
Machida
K
K
Honda
N
N
Mamiya
T
T
Takahashi
T
T
Kamano
T
T
Muramatsu
M
M
Kashimada
A
A
D000086:Acetazolamide / Q000494:pharmacology*; D000368:Aged; D001921:Brain / Q000000981:diagnostic imaging; D002560:Cerebrovascular Circulation / Q000187:drug effects*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D013668:Technetium Tc 99m Aggregated Albumin; D016284:Technetium Tc 99m Pentetate; D014664:Vasodilation / Q000187:drug effects
D013668:Technetium Tc 99m Aggregated Albumin; C057162:technetium Tc 99m DTPA HSA; D000086:Acetazolamide; D016284:Technetium Tc 99m Pentetate