Cardiac Surgery Certification (CSC) Practice Exam – Prep & Study Guide

In the context of a post-coronary artery bypass graft (CABG) patient who has undergone extensive use of contrast during cardiac catheterization, the likelihood of developing acute kidney injury (AKI) is heightened. This is primarily due to a phenomenon known as contrast-induced nephropathy (CIN), which can occur when the kidneys are exposed to a significant volume of contrast material.

The kidneys are particularly vulnerable to the nephrotoxic effects of contrast agents, especially if there are pre-existing risk factors such as diabetes mellitus, chronic kidney disease, dehydration, or even recent hypotension. The contrast material can lead to a decrease in renal perfusion, as well as an increase in renal tubular toxicity and inflammation, ultimately leading to the decline in renal function characteristic of AKI.

In contrast, while acute respiratory failure, excessive mediastinal bleeding, and ischemic stroke can occur in a post-CABG setting, they are less directly associated with the administration of contrast during cardiac catheterization. Acute respiratory failure may relate more to pulmonary complications from surgery or pre-existing conditions. Excessive mediastinal bleeding is often due to surgical technique, anticoagulation therapy, or coagulopathy rather than contrast use. Similarly, ischemic stroke can occur