In patients with renal insufficiency, any contrast agent applied can affect the patient’s renal function to varying degrees. All stenting procedures require the application of contrast agents. The effect of contrast on renal function is related to the amount of contrast agent used at one time, the degree of hydration in the patient, the amount of osmotic pressure of the selected contrast agent, and the patient’s underlying renal function. According to the patient data provided, a coronary angiogram should be performed first to evaluate the coronary lesion and, if interventional therapy is required, to assess the possible amount of contrast agent. Therefore, to perform interventional treatment in such patients, it is important to take into account the heart and kidney, to divide the procedure as much as possible, to use as little contrast agent as possible, to choose a contrast agent with as little osmotic pressure as possible, and to do as much pre- and post-procedure hydration as possible.