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Thallium-201 myocardial SPECT in myocardial bridging
B Mouratidis1, F E Lomas, D McGill
1Department of Nuclear Medicine, Woden Valley Hospital, Canberra, Australia.
Insights
Myocardial bridging, a rare condition where heart muscle narrows arteries during systole, can cause chest pain. This case shows how bridging of the left anterior descending artery led to reversible myocardial ischemia.
Area of Science:
- Cardiology
- Cardiovascular Medicine
- Diagnostic Imaging
Background:
- Myocardial bridging is an anatomical anomaly where a segment of a coronary artery courses through the myocardium.
- It can lead to dynamic obstruction of coronary blood flow, especially during increased heart rates.
- This condition is often associated with symptoms of myocardial ischemia.
Observation:
- A patient presented with typical angina symptoms.
- Angiography revealed significant (60%) systolic narrowing of the left anterior descending artery due to myocardial bridging.
- Exercise thallium-201 single-photon emission computed tomography (SPECT) showed perfusion defects in the left ventricle.
Findings:
- SPECT imaging indicated severe reduction in septal perfusion and moderate reduction in anterior wall perfusion.
- Post-exercise imaging demonstrated reversible perfusion defects, suggesting exercise-induced myocardial ischemia.
- The findings correlate the anatomical bridging with functional ischemic consequences.
Implications:
- This case supports the hypothesis that myocardial bridging can be a cause of myocardial ischemia.
- It highlights the utility of stress SPECT imaging in diagnosing functional impairment due to myocardial bridging.
- Further research into the clinical significance and management of myocardial bridging is warranted.
Abstract:
Myocardial bridging is an uncommon condition where a major coronary artery is bridged by a band of muscle and narrows during systole, particularly during rapid heart rates. We present a patient with typical angina and angiographically proven 60% systolic bridging of the left anterior descending artery distal to the first perforator. Postexercise SPECT 201TI scanning demonstrated a severe reduction of perfusion to the septum and a moderate reduction of perfusion to the anterior wall of the left ventricle. Redistribution images demonstrated good reversibility of the perfusion defects indicating reversible myocardial ischemia. This case provides additional supportive evidence that myocardial bridging may cause myocardial ischemia.