Your brother’s heart condition is considered serious given the fact that a stent is already in place. Any procedure has to be considered carefully if there is a chance it can help him.
However, exposure to radiographic contrast dye during coronary angiography is well known to cause either transient decreases in renal function or acute renal failure. Although the overall incidence is low, acute renal failure occurs most frequently in patients with both diabetes and chronic renal failure where the average reported incidence is upwards of 20%.
Given the fact that your brother is already on dialysis, the effect the dye might have on the renal function has to be taken more seriously.
In the end, you might talk to the specialists that perform the dialysis about whether it is safe for the specific brand of dye (provided by the cardiologist that would approve the angiography) to be used. The dye usually can be filtered through the filters for dialysis, but it might further decrease the function of the kidneys if there is any still left.
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