Option 4 is the correct answer. Hypotension refers to low blood pressure, while a heart attack is a condition where the blood flow to the heart muscle is blocked or reduced, resulting in a lack of oxygen to the heart. Therefore, option 4 matches the correct relationship.

Option 1 is incorrect because a coronary attack is also known as a heart attack, and it occurs due to blockage or narrowing of the coronary arteries, not vascular dilation.

Option 2 is incorrect because atherosclerosis refers to the buildup of fatty deposits called plaque in the arteries, leading to narrowing and blockage, not the blockage itself.

Option 3 is incorrect because hypertension refers to high blood pressure, not low blood pressure.

In summary, the correct match is option 4: Hypotension - heart attack.