A cardio Angiography
requires a dye or a contrast medium to be injected .
Contrast medium can be damaging to the kidneys. Usually, this damage is temporary and corrects itself quickly. However, because the kidneys remove metformin
, contrast medium can greatly increase the level of metformin in the blood because damaged kidneys are not as effective at removing metformin from the body. High levels of metformin in the blood increase the risk of lactic acidosis
.Because lactic acidosis is so dangerous, metformin should be temporarily stopped for procedures involving contrast medium.
To avoid you from developing lactic acidosis,your doctor has asked to stop taking oral anti diabetics.These are generally stopped 48 hours prior to the test and not given for another 48 hours after the test.