The 67-year-old client with a mechanical mitral valve takes warfarin; warfarin 4 mg each evening; amiodarone was started 4 days ago for atrial fibrillation. The client reports weakness and new left flank and back pain. Blood pressure is 84/48 mm Hg, heart rate 106/min, respiratory rate 22/min, temperature 36.7°C (98.1°F), and oxygen saturation 97% on room air. Hemoglobin is 7.6 g/dL, down from 11.9 g/dL, INR is 6.8, platelets are 214,000/mm3, WBC is 8,400/mm3, and creatinine is 1.0 mg/dL. The abdomen has no visible bruising. The mechanical valve click is crisp and there is no new murmur. CT confirms an expanding left retroperitoneal hematoma. Complete the diagram by selecting the condition the client is most likely experiencing, 2 actions the nurse should take to address that condition, and 2 parameters the nurse should monitor to assess the client's progress.

Quick answer
Warfarin-associated major hemorrhage. Actions: administer the prescribed IV 4-factor PCC; administer the prescribed IV vitamin K. Monitor: blood pressure and heart rate, and hemoglobin level.

Why this is correct
Amiodarone inhibits warfarin metabolism, which explains the INR of 6.8. Major bleeding with hemodynamic instability requires immediate reversal: 4-factor prothrombin complex concentrate replaces factors II, VII, IX, and X within minutes, and IV vitamin K allows the liver to make new factors so the INR does not rebound. The mechanical valve raises thrombosis concern, but a life-threatening bleed takes priority, and anticoagulation is resumed later once bleeding is controlled.

Easy analogy or mental picture
PCC is the fire hose that puts out the fire now; IV vitamin K is the sprinkler system that keeps it from reigniting after the hose is turned off.

Memory hook
Bleeding and shocked on warfarin: PCC now plus vitamin K IV.

NCLEX decision rule
For life-threatening anticoagulant bleeding, choose rapid reversal plus sustained reversal; save management of the indication for anticoagulation until the bleeding is controlled.

Why the other choices are wrong
Supratherapeutic INR without bleeding is ruled out by the CT and hemoglobin fall; oral vitamin K or holding warfarin with a 24-hour recheck is correct only in that situation. Valve thrombosis would cause a muffled click or new murmur, which are absent, so valve click quality is the wrong trend. Septic shock is unlikely with a normal temperature and WBC. A heparin infusion to protect the valve is appropriate later, after bleeding is controlled, not now. TSH tracks a later amiodarone adverse effect, not the bleed.