18. Which of the following is true about glycoprotein IIb/IIIa inhibitors?

A. Are recommended for use prior to percutaneous coronary intervention in high risk ST elevation myocardial infarction patients

B. Are recommended for use at the time of percutaneous coronary intervention in patients with ST elevation myocardial infarction

C. Glycoprotein IIb/IIIa inhibitors should not be used simultaneously with bivalirudin

D. All of the above are true

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