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[Detectability of diagonal branch disease by 201TlCl exercised myocardial scintigraphy]
Y Hirose1, T Nishimura, T Uehara
1Department of Radiology and Nuclear Medicine, National Cardiovascular Center.
Insights
Single photon emission computed tomography (SPECT) effectively detects diagonal branch lesions in coronary artery disease. SPECT imaging also quantitatively assesses the extent of these lesions, aiding in diagnosis and treatment planning.
Area of Science:
- Cardiology
- Nuclear Medicine
- Medical Imaging
Background:
- Assessing diagonal branch lesions in coronary artery disease is crucial for patient outcomes.
- Traditional planar imaging has limitations in detecting these specific lesions.
- Coronary angiography defines stenosis but not always functional significance.
Observation:
- Chest pain and ischemic electrocardiographic changes were observed in patients with significant diagonal branch lesions.
- Planar myocardial scintigraphy detected diagonal branch lesions in only 40% of patients.
- Single photon emission computed tomography (SPECT) detected these lesions in 100% of patients.
Findings:
- SPECT imaging demonstrated superior detectability of diagonal branch lesions compared to planar imaging.
- Perfusion defects in SPECT localized to the anterior to anterolateral wall.
- Coronary territory maps derived from SPECT enabled quantitative evaluation of lesion extent.
Implications:
- SPECT is a valuable tool for diagnosing and evaluating the extent of diagonal branch lesions.
- Quantitative assessment using SPECT-derived coronary territory maps aids in differentiating myocardial infarction from angina.
- This technique improves the diagnostic accuracy for isolated diagonal branch stenosis.
Abstract:
The detectability of diagonal branch disease in 10 patients (five with angina pectoris, five with myocardial infarction) with isolated diagonal branch lesions (more than 75% luminal stenosis in coronary angiography) was reviewed. In exercised 201TlCl myocardial scintigraphy, chest pain occurred in four of 10 patients, electrocardiographic change indicating myocardial ischemia was seen in four, and diagonal branch lesion was detected in only four patients by planar images. In contrast, diagonal branch lesions were detected in 10 of 10 patients by SPECT (single photon emission computed tomography). In planar images, perfusion defects appeared high in the anterolateral, posterolateral, and anterior walls of the left ventricle. In SPECT images they appeared high in the anterior to anterolateral wall. The extent of diagonal branch lesions could be quantitatively evaluated by coronary territory maps developed from unfolded maps of exercised SPECT. The mean ratio of the extent of diagonal branch lesion to left anterior descending branch territory was 24.7%, and the extent of myocardial infarction was significantly larger than that of angina pectoris (p < 0.05). In conclusion, SPECT is useful for detecting diagonal branch lesions and can quantitatively show the extent of these lesions by coronary territory map.