One of the main problems arising from a diagnostic coronary angiogram is bleeding from the arterial site. We observe the patient closely post procedure for this. SeK+ does not tend to change due to the procedure, but should be monitored to ensure it is within normal limits. Contrast dye can cause renal impairment, thus affecting the K+. For all angiograms there is a 0.1% chance of MI, stroke and death. Stroke can be caused by dislodgment of LV thrombus during an LV gram or from cholesterol emboli being dislodged from the arterial wall (usually the aorta).