External imaging of human atherosclerosis

Area of Science:

• Cardiovascular Imaging
• Nuclear Medicine
• Vascular Biology

Background:

• Atherosclerosis is a significant cause of stroke, particularly affecting carotid arteries.
• Accurate imaging of atherosclerotic lesions is crucial for diagnosis and management.
• Current diagnostic methods may have limitations in visualizing the extent of plaque activity.

Purpose of the Study:

• To evaluate the feasibility of using I-125 labeled low-density lipoproteins (LDL) as a tracer for external imaging of carotid artery atherosclerosis.
• To determine if I-125 LDL can specifically identify atherosclerotic lesions in vivo.

Main Methods:

• Autologous LDL was isolated, labeled with iodine-125 (I-125).
• I-125 LDL was intravenously injected into three patients with known carotid artery disease and one control subject.
• Gamma camera imaging was performed at intervals (6-36 hours post-injection).
• Results were compared with conventional angiography.

Main Results:

• Successful imaging of carotid atherosclerotic lesions was achieved in all three patients.
• No focal accumulation of I-125 LDL was observed in the carotid arteries of the control subject.
• The distribution of I-125 LDL correlated with confirmed atherosclerotic lesions.

Conclusions:

• Iodine-125 labeled low-density lipoproteins can effectively image atherosclerotic lesions in the carotid arteries.
• This technique shows promise for non-invasive, external imaging of atherosclerosis.
• The method may allow for monitoring the progression or regression of carotid artery disease.