Barium would not be the contrast media of choice to use on a patient with the suspicion of:

Barium is a radiopaque contrast agent commonly used in imaging studies to enhance the visualization of the gastrointestinal (GI) tract. However, it is contraindicated in certain situations due to its properties. When there is a suspicion of a bowel perforation, the use of barium is not advisable because if there is a perforation, barium could leak into the peritoneal cavity. This can lead to complications such as peritonitis, a serious and potentially life-threatening condition.

In cases of bowel perforation, water-soluble contrast agents are preferred because they can be absorbed by the body and do not lead to the complications associated with barium. The importance of avoiding barium in this context stems from the need to prevent any exacerbation of the patient's condition and to manage the clinical situation appropriately.