Investigation of choice in aoic dissection is

C i.e. MRI Aoic dissection - Most patients are in 50-70 years age group present with very sudden onset pain, often accompanied by tearing sensation. It is usually felt in the precordium & substernal region but may be in back between scapula. These patients are usually misdiagnosed as having cardiac ischemia, which increases risk of complications. - Dialation & dissection in Morphan SyndromeQ are probably caused by a failure to resist shearing stress in media. In Ehlers-DanlosQ collagen molecule abnormalities predispose to dialation & saccular aneurysms but not to dissection these patients have normal resistance to shearing stress. - Stanford classifies it into two types as Type A (involving ascending aoa) - which is more common & carry high probability of complications & moality; and Type B (not involving ascending aoa). * Aoography is the gold standardQ