99mTc-MIBI myocardial perfusion imaging in myocarditis

Area of Science:

• Cardiology
• Nuclear Medicine
• Pediatric Infectious Diseases

Background:

• Myocardial perfusion imaging using technetium-99m-labelled methoxyisobutyl isonitrile single photon emission computed tomography (99mTc-MIBI SPECT) is crucial for assessing myocardial ischemia.
• Infectious diseases like myocarditis can impact myocardial perfusion due to inflammation and necrosis.
• Coxsackie viral myocarditis is a significant concern in pediatric cardiology.

Purpose of the Study:

• To evaluate the diagnostic value of 99mTc-MIBI myocardial perfusion imaging in children diagnosed with Coxsackie viral myocarditis.
• To compare 99mTc-MIBI SPECT findings with other cardiac monitoring methods in this patient group.

Main Methods:

• 46 pediatric patients (3-12 years) with Coxsackie viral myocarditis underwent 99mTc-MIBI myocardial perfusion imaging.
• Perfusion data was analyzed and compared with myocardial enzymes (CK-MB), electrocardiographic (ST-T segment) findings, and echocardiography (left ventricular function).

Main Results:

• All 46 patients exhibited regions of hypoperfusion, indicating compromised myocardial blood flow.
• 37% of patients displayed two or more areas of diminished perfusion.
• Myocardial hypoperfusion severity correlated significantly with elevated creatine-kinase isoenzyme (CK-MB) levels, ST-T segment changes, and reduced left ventricular function (P<0.05).

Conclusions:

• 99mTc-MIBI myocardial uptake may serve as a marker for myocardial inflammation and necrosis in pediatric viral myocarditis.
• 99mTc-MIBI SPECT imaging provides valuable additional diagnostic information for Coxsackie viral myocarditis in children.
• The imaging technique demonstrates strong correlation with established biomarkers and functional assessments of cardiac health.