... increased risk for hyperhomocysteinemia and venous thrombosis, my docotor was aware of this before pacemaker surgery , was he spposed to give me heprin before or right after surgery, he did not and I have DVT in my subclavian down to my elbow, he never gave me heperin even after I had my ultra sound a couple weeks after surgery in an outpatient faculity I was told by him I could go home and he called the coumadin in 12hours later the radiologist didn't understand why he didn't send me to the hospital!