Final answer:
The abnormality in the PET myocardial perfusion study using Rubidium-82 likely indicates an issue with the coronary arteries, potentially due to atherosclerosis.
Step-by-step explanation:
The abnormality in the PET myocardial perfusion study using Rubidium-82 likely points to an issue with one or more of the coronary arteries. In a normal coronary artery, blood flow is not obstructed, allowing oxygen-rich blood to be delivered to the heart tissues. However, in the presence of atherosclerosis, plaque build-up can occur, causing narrowing or blockages in the coronary arteries, leading to decreased blood flow and insufficient oxygen delivery to the cardiac tissues.