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[Scintigraphy of the myocardium in ischemic heart disease]
Insights
This study shows how assessing myocardial perfusion disorders can differentiate between necrotic and ischemic heart lesions. Myoglobin levels correlate with lesion size, aiding in diagnosis for acute coronary syndromes.
Area of Science:
- Cardiology
- Nuclear Medicine
- Biochemistry
Background:
- Acute coronary syndromes (ACS) and stable angina require accurate differentiation of myocardial lesions.
- Assessing myocardial perfusion is crucial for understanding the extent of heart damage.
Purpose of the Study:
- To investigate the combined assessment of myocardial perfusion disorders in patients with various coronary heart diseases (CHD).
- To correlate the degree and type of technetium-99m pyrophosphate (RP) accumulation with myocardial lesion size and biochemical markers.
Main Methods:
- Scintigraphy was used to assess myocardial perfusion and RP accumulation in 106 patients with acute CHD and stable angina.
- Biochemical markers of necrosis, including myoglobin concentration and isoenzyme activity, were measured in blood serum.
- Correlation between scintigraphic findings and biochemical markers was analyzed.
Main Results:
- Combined assessment of perfusion disorders allowed differentiation between necrotic and ischemic myocardial lesions.
- A direct correlation was found between the degree/type of RP accumulation and the size of necrotic myocardial lesions.
- Myoglobin concentration showed parallelism with scintigraphy results: focal RP accumulation corresponded to maximum myoglobin levels, while diffuse accumulation indicated transient ischemia.
Conclusions:
- Scintigraphic assessment of RP accumulation, combined with biochemical markers like myoglobin, effectively differentiates myocardial necrosis from ischemia in CHD.
- Diffuse RP accumulation is indicative of transient perfusion disorders in stable and unstable angina, suggesting myocardial ischemia.
Abstract:
Altogether 106 patients with different types of acute CHD (large and small local MI, unstable angina) and stable angina were investigated. Combined assessment of perfusion disorder permits differentiation of necrotic and ischemic myocardial lesions. A degree and type of RP accumulation corresponds to a size of necrotic myocardial lesion determined by means of biochemical markers of necrosis. Parallelism of myoglobin concentration, isoenzyme activity in the blood serum and the results of scintigraphy was revealed. In focal RP accumulation, myoglobin concentration reached maximum values; a moderate increase and decrease up to normal values in the absence of accumulation were observed in diffuse accumulation. Diffuse RP accumulation in patients with stable and unstable types of angina was indicative of transient perfusion disorders resulting from myocardial ischemia.