title: Serial Myocardial Imaging after a Single Dose of Thallium-201.
abstract: Although thallium-201 exercise scintigraphy has been established for the detection of myocardial ischemia and viability, little is known regarding the myocardial thallium-201 kinetics during angioplasty. Herein, we report a 77-year-old man with angina pectoris, in whom serial myocardial imaging after a single dose of thallium-201 was helpful in identifying not only the culprit lesion and myocardial viability, but also the dynamic changes in myocardial perfusion during angioplasty. Thallium-201 images after exercise showed a perfusion defect in the inferior wall, with a trivial redistribution 3 hours after the exercise and a marked improvement 24 hours later. Coronary angiography, performed 27 hours after exercise scintigraphy, showed severe stenosis in the right coronary artery. Guidewire crossing of the lesion interrupted the antegrade flow, which was restored after balloon dilation and stent implantation. Thallium-201 images, 2 hours after angioplasty (i.e., 30 hours after exercise), showed a decreased tracer uptake in the inferior wall, which improved the next day (i.e., 48 hours after exercise). Cardiac biomarkers were negative in the clinical course.
authors.affiliation: Department of Cardiology, Matsushita Memorial Hospital, Osaka, Japan.
authors.forename: Takahiko
authors.initials: T
authors.lastname: Kamata
authors.affiliation: Department of Cardiology, Matsushita Memorial Hospital, Osaka, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Kawasaki
authors.affiliation: Department of Cardiology, Matsushita Memorial Hospital, Osaka, Japan.
authors.forename: Tadaaki
authors.initials: T
authors.lastname: Kamitani
authors.affiliation: Department of Cardiology, Matsushita Memorial Hospital, Osaka, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Sugihara
keywords: Angioplasty; Kinetics; Myocardial ischemia; Thallium