Ohle R, et al. - The diagnostic accuracy of clinical and laboratory findings for acute aortic dissection (AAD) was assessed in confirmed cases of AAD and in a low-risk control group. The absence of abrupt-onset pain can assist in ruling out AAD. Presence of tearing/ripping pain, aortic aneurysm, hypotension, pulse deficit, neurologic deficits, and a new murmur can assist ruling in the diagnosis of AAD. They recommended considering patients with one or more high-risk feature at high risk, and patients with no high-risk and multiple low-risk features at low risk for AAD.