All but which of the following are contraindications for a thoracic aortogram?

The correct answer identifies diabetes as not being a contraindication for performing a thoracic aortogram. Diabetes can affect a patient’s overall cardiovascular health and may influence the risk factors associated with procedural outcomes, but it does not inherently prevent the performance of an aortogram.

On the other hand, abnormal anticoagulation, severe hypertension, and bleeding diathesis directly impact the safety of the procedure. Abnormal anticoagulation indicates that the patient's blood may not clot properly, increasing the risk of hemorrhage during and after the procedure. Severe hypertension can lead to complications during the aortogram, such as the risk of rupture or bleeding due to the pressure changes in the vascular system. Bleeding diathesis refers to a predisposition to bleeding due to various medical conditions or treatments, which would pose a similar risk during the invasive procedure.

Understanding these risk factors is crucial for ensuring patient safety and optimizing procedural outcomes in vascular interventions.