[Detectability of diagonal branch disease with other branch lesions by 201TlCl exercised myocardial scintigraphy]
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Y Hirose1, T Nishimura, T Uehara
1Department of Tracer Analysis, Biomedical Research Center, Osaka University Medical School.
Insights
Single-photon emission computed tomography (SPECT) effectively detects coronary diagonal branch disease, especially when it co-occurs with left anterior descending lesions. However, SPECT may struggle to identify diagonal branch disease alongside left circumflex or right coronary artery lesions.
Area of Science:
- Cardiology
- Nuclear Medicine
- Diagnostic Imaging
Background:
- Coronary artery disease (CAD) affects millions globally, with specific branch involvement impacting diagnosis and treatment.
- Accurate detection of disease in smaller coronary branches, like the diagonal (Dx) branch, is crucial for effective patient management.
- Myocardial perfusion imaging using thallium-201 chloride (201TlCl) with planar and SPECT techniques is a standard diagnostic tool.
Observation:
- This study evaluated the detectability of Dx branch disease in 24 patients (16 with myocardial infarction, 8 with angina pectoris) who also had other coronary artery diseases.
- Patients had co-existing lesions in the left anterior descending (LAD), left circumflex (LCX), or right coronary artery (RCA).
- Diagnostic performance was assessed using 201TlCl myocardial planar and SPECT imaging.
Findings:
- SPECT imaging demonstrated higher sensitivity for detecting Dx branch disease compared to planar imaging across all patient groups.
- When Dx branch disease co-occurred with LAD #7 lesions (n=10), SPECT detected abnormalities in 80% of cases, versus 30% for planar imaging.
- Detectability was lower for Dx branch disease with LCX lesions (SPECT 57%, planar 43%) and RCA lesions (SPECT 29%, planar 14%).
Implications:
- SPECT imaging is a valuable tool for diagnosing coronary diagonal branch disease, particularly when co-existing with LAD disease.
- The study highlights limitations of SPECT in detecting Dx branch disease when concurrent lesions are present in the LCX or RCA.
- Further research may be needed to optimize imaging protocols for improved detection of Dx branch disease in complex coronary artery disease scenarios.
Abstract:
The detectability of coronary diagonal (Dx) branch disease in 24 patients (16 with myocardial infarction, 8 with angina pectoris; mean age of 56) with other branch (left anterior descending branch [LAD], left circumferential branch [LCX], or right coronary artery [RCA]) diseases was reviewed with 201TlCl exercised myocardial planar and SPECT images. In Dx branch disease with LAD #7 lesion (n = 10), Dx perfusion abnormality was detected in planar and SPECT images in 3 (30%) and 8 patients (80%), respectively. In Dx branch disease with LCX lesion (n = 7), Dx perfusion abnormality was detected in planar and SPECT images in 3 (43%) and 4 patients (57%), respectively. In Dx branch disease with RCA lesion (n = 7), Dx perfusion abnormality was detected in only 1 (14%) and 2 patients (29%), respectively. In conclusion, SPECT is a useful modality for detecting Dx branch disease, but it is sometimes hard to detect Dx branch disease with LCX and RCA lesions.