Blood pressure differential in assessing patients for aortic dissection

From The Bottom Line:

Bottom line: Presence of chest pain with blood pressure differential and/or pulse differential should raise clinical suspicion of aortic dissection. There is evidence that the presence of pressure difference greater than 20mmHg is a strong predictor of dissection, but absence of pressure differential should not exclude a diagnosis of aortic dissection.

Klompas M. Does this patient have an acute thoracic aortic dissection?