When treating catheter-related thrombosis in an upper extremity PICC, what is the preferred initial anticoagulation agent according to current guidelines?
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A
Unfractionated heparin IV infusion
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B
Low molecular weight heparin (LMWH) or direct oral anticoagulant (DOAC)
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C
Warfarin initiated immediately
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D
Thrombolytic therapy with alteplase