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Vs changes can be a late finding in large pe.So let's say clinically a patient has a dvt and very likely a PE, but vitals are normal. You find a positive dvt on ultrasound. Would you forgo the CTA since it won't change your management?
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The pe could be causing right heart strain with normal or close to normal vitals.
You could get an echo and forgo the ct, but there probably has to be a good reason for not getting a ct, other than radiation.
Also making the definitive diagnosis of pe may change the long term anticoagulation plan.
The short answer is that i usually get a ct unless there is a contraindication.
If I think there is a dvt and a pe, I usually pursue the pe diagnosis first.