Which of the following injection rates is typically not used during abdominal aortography?

The correct answer is based on the typical practices and standard protocols used to perform abdominal aortography, particularly concerning the injection rates of contrast media.

During abdominal aortography, the injection rate of contrast media is crucial for obtaining high-quality images. The range around 10 - 20 mL/sec is generally considered too fast for this procedure. High injection rates like this could potentially lead to rapid contrast dispersal, which can interfere with the visualization of the abdominal aorta and its branches. Additionally, rapid injections can also raise the risk of complications, such as contrast-induced nephropathy, and may pose challenges in managing the patient's hemodynamic status during the procedure.

In contrast, the other specified rates—5 - 10 mL/sec, 7 - 15 mL/sec, and 2 - 4 mL/sec—are within acceptable limits for effective imaging. Lower injection rates allow for better control over contrast distribution, leading to clearer and more diagnostic images. Moreover, they help reduce the risk of adverse effects on patient safety during the procedure. Therefore, while performing abdominal aortography, the rate of 10 - 20 mL/sec is not typically used, which solidifies it as the correct answer in this context