<prompt> Answer this question truthfullyWhat are the guidelines one must follow for echocardiography?  <response>: <reason> Class I Aortic dissection, diagnosis, location, and extent. Aortic aneurysm. Aortic intramural hematoma. Aortic rupture. Aortic root dilation in Marfan syndrome or other connective tissue syndromes. Degenerative or traumatic aortic disease with clinical atheroembolism. Follow-up of aortic dissection, especially when complication or progression is suspected. First-degree relative of a patient with Marfan syndrome or other connective tissue disorder for whichTTE is recommended see section XIIa. Class IIa Follow-up of a patient with surgically repaired aortic dissection. 