A left arm blood pressure that is 40 mmHg lower than the right may indicate all of the following EXCEPT?

When considering the implications of a significant difference in blood pressure readings between the left and right arms, the correct answer highlights a condition that wouldn't typically lead to this symptom.

Innominate artery occlusion typically does not present as a disparity in blood pressure between the arms, as this occlusion affects blood flow before it branches into the arms. Therefore, both arms are likely to exhibit reduced blood pressure, but they would not diverge significantly in terms of their measurements.

On the other hand, conditions like thoracic outlet entrapment, subclavian steal syndrome, and coarctation of the aorta are known to cause a notable difference in blood pressure readings between the arms. Thoracic outlet syndrome can compress blood vessels affecting circulation to one arm. Subclavian steal syndrome involves the reversal of blood flow in the subclavian artery leading to lower blood pressure readings on the affected side. Coarctation of the aorta, often located near the left subclavian artery, could cause decreased blood flow to the left arm compared to the right, leading to a 40 mmHg difference.

Thus, the correct response points to a situation where the differential pressure between the arms would not be expected, as innominate artery occlusion does