Final answer:
The interaction between metformin and iodine-containing contrast dye can increase the patient's risk of acute renal failure.
Step-by-step explanation:
When a patient taking metformin for type 2 diabetes mellitus plans to undergo angiography using iodine-containing contrast dye, there is a potential interaction between the metformin and the dye. This interaction can increase the patient's risk of acute renal failure.
The iodine-containing contrast dye can cause kidney damage, especially in patients with pre-existing renal dysfunction. Metformin, when combined with the dye, further increases the risk of kidney damage and may lead to acute renal failure.
It is important for the healthcare professional to be aware of this interaction and take necessary precautions, such as temporarily discontinuing the metformin and closely monitoring the patient's renal function before and after the procedure.