A patient is starting warfarin (Coumadin) therapy as part of treatment for atrial fibrillation. The nurse will follow which principles of warfarin therapy? (Select all that apply.) a Teach proper...

A patient is starting warfarin (Coumadin) therapy as part of treatment for atrial fibrillation. The nurse will follow which principles of warfarin therapy? (Select all that apply.) a Teach proper subcutaneous administration b Administer the oral dose at the same time every day c Assess carefully for excessive bruising or unusual bleeding d Monitor laboratory results for a target INR of 2 to 3 e Monitor laboratory results for a therapeutic aPTT value of 1.5 to 2.5 times the control value