Which of the following is NOT a potential complication of venography?

The option indicating decreased blood pressure is not typically associated with venography as a potential complication. Venography, which involves the injection of contrast material into a vein to visualize the venous system through imaging techniques, may lead to complications related to the contrast material, such as allergic reactions, or issues affecting the veins themselves.

Paradoxical stroke in the case of deep vein thrombosis (DVT) occurs when a thrombus in the venous system allows clots to enter systemic circulation, potentially leading to a stroke; this can occur due to shunting in certain congenital heart conditions or venous lesions. Allergic reactions to the contrast material used during venography are known complications and can range from mild skin reactions to more severe anaphylactic responses. Thrombophlebitis, an inflammation of a vein associated with thrombus formation, can also occur after venography due to irritation from the contrast material or catheterization.

Since decreased blood pressure is not a recognized complication of the venography procedure itself, it is the correct answer as the option that does not align with the potential complications commonly encountered during or after venography.