Investigations

• transoesophageal echocardiography (TEE) ^a  

Why?

Transoesophageal echocardiography can diagnose and exclude aortic dissection

Patient	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
suspected aortic dissection a (pre-test probability: 55%)	aortic dissection (aortography, surgery, or autopsy)	transoesophageal echocardiography	4.2 (2.1 to 8.6)	84%	0.030 (0.04 to 0.20)	4%

Note:

• Transoesophageal echocardiography can be performed at the bedside ^d