Which of the following is a contraindication for renal artery angiography?

Renal artery angiography involves the use of imaging to evaluate the renal arteries, and contraindications are critical considerations in determining whether the procedure should be performed. In the context of the question, the indication that a kidney length greater than 8 cm is a contraindication stems from potential complications related to the size of the kidneys during the procedure. A larger kidney may suggest underlying issues such as hypertrophy or the presence of masses, which could complicate access or affect the visualization of the renal vasculature.

The other options do not typically constitute absolute contraindications for renal artery angiography. For instance, being over a certain age, such as 70, while it might raise concerns about the risks associated with procedures and anesthesia, is not an automatic disqualifier for renal angiography. Similarly, the presence of asthma generally does not contraindicate the procedure; care may be taken during the administration of any contrast material, but asthma alone does not preclude a renal angiogram. Recent viral infections can raise concerns regarding the patient's overall health and recovery, but again, they do not specifically contraindicate the procedure.

In this context, the focus on kidney length highlights the anatomically and surgically pertinent issues that could arise during renal artery angiography, making it