The below are open source tools and mostly available on GNU/Linux, and can run on other platforms too: 1  GeoGebra - open source software for dynamic geometry, algebra and calculus for middle/high school and college. Exports interactive web pages.  Kig[1] A GUI based geometry editor.
â¢ Before surgery, wait at least 24 hours after the last dose of LMW heparin is administered before a spinal/epidural catheter is placed. â¢ After surgery, when there is adequate surgical site hemostasis, for twice daily dosing, wait at least 24 hours after catheter removal before resuming therapeutic-dose LMW heparin.
should stop taking warfarin 5 days before elective surgery, and most do not need to receive heparin in the perioperative period as a bridge to surgery. KEY POINTS Some procedures, such as some ophthalmic, endoscopic, and dermatologic procedures, entail a low risk of bleeding and do not require that warfarin therapy be interrupted. If warfarin is withheld for 5 days, the international normalized ratio usually falls to less than 1.5, and surgery is usually safe. Infusions of fresh-frozen plasma or intravenous or oral vitamin K can reverse anticoagulation quickly before emergency surgery.