Question: why choose lmwh over heparin?
Answer: Because LMWH has more predictable pharmacokinetics and anticoagulant effect, LMWH is recommended over unfractionated heparin for patients with massive pulmonary embolism, and for initial treatment of deep vein thrombosis. ... LMWH can also be used to maintain the patency of cannulae and shunts in dialysis patients.