My 80 year old mother is due to have a permanent filter implanted in her inferior vena cava because she is at high risk of DVT's and conventional anticoagulant therapy is no longer suitable. I am extremely concerned because 4 years ago, I underwent an angiogram following a heart attack during which my right femoral artery was torn in 6 places and my external iliac artery was torn in 2 places. I needed 5 hours of surgery to repair this damage, during which I had 18 units or blood transfused. I was lucky not to lose my right leg, never mind my life. Artery walls are thicker than vein walls and my mum is known to have poor veins. Also, she had the veins in her right leg stripped to sort out her varicose veins, though this was over 20 years ago. Am I right to be worried, or has my own experience nothing to do with what happens to my mother?