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Dipyridamole-thallium-201 tomography documenting improved myocardial perfusion with therapy in Kawasaki disease
C A Nienaber1, R P Spielmann, G Hausdorf
1Department of Cardiology, University Hospital Eppendorf, Federal Republic of Germany.
Insights
Thallium-201 scans help assess heart function in children with Kawasaki disease. The nuclear imaging technique shows improved myocardial perfusion after treatment, even in those with coronary aneurysms.
Area of Science:
- Pediatric Cardiology
- Nuclear Cardiology
- Cardiovascular Imaging
Background:
- Kawasaki disease is a leading cause of acquired heart disease in children.
- Coronary artery aneurysms are a common complication, increasing the risk of myocardial ischemia.
- Assessing myocardial perfusion is crucial for managing long-term cardiovascular health in affected children.
Purpose of the Study:
- To evaluate the utility of Thallium-201 (Tl-201) tomographic perfusion scintigraphy with pharmacologic vasodilation stress.
- To assess myocardial perfusion in children with a history of Kawasaki disease and coronary aneurysms.
- To determine the impact of medical therapy on regional myocardial perfusion.
Main Methods:
- Seven children (2y 8m to 8y 7m) underwent Tl-201 tomographic perfusion studies 3-20 months post-acute Kawasaki disease.
- All patients had pre-existing coronary aneurysms identified by echocardiography.
- Pharmacologic vasodilation stress was employed during the scintigraphy.
Main Results:
- Six of seven children showed no significant regional reduction in Tl-201 uptake and remained asymptomatic.
- One child with acute myocardial infarction demonstrated persistent and transient Tl-201 defects, correlating with coronary artery obstruction.
- Follow-up nuclear scans after 8 months of treatment showed significant improvement in perfusion defects and reduced ischemia.
Conclusions:
- Tomographic Tl-201 perfusion scintigraphy with vasodilation stress is a valuable tool for assessing myocardial perfusion in pediatric Kawasaki disease.
- The technique can identify significant perfusion abnormalities, including in cases of myocardial infarction.
- The study demonstrates marked improvement in regional myocardial perfusion following adequate medical therapy in children with Kawasaki disease.
Abstract:
Thallium-201 tomographic perfusion studies after pharmacologic vasodilation were performed in seven children (aged 2 years 8 months to 8 years 7 months), 3 to 20 months after the acute stage of the disease. In all patients coronary aneurysms were seen on cross-sectional echocardiograms. The scintigrams of six children showed no significant regional reduction of myocardial thallium-201 uptake. These children had remained asymptomatic in the follow-up period after the acute inflammatory stage of Kawasaki disease. Persistent and transient thallium defects were present in one child with acute posterolateral myocardial infarction; obstruction of two coronary vessels supplying the defect zones was confirmed by contrast angiography. After 8 months of treatment a follow-up nuclear scan showed marked reduction in the size of the defect and almost complete abolishment of the ischemic reaction. Thus tomographic thallium-201 perfusion scintigraphy in conjunction with vasodilation stress is useful to assess myocardial perfusion in children with Kawasaki disease and demonstrates marked improvement in regional perfusion after adequate medical therapy.