In CABG patients, the American College of Chest Physicians Evidence-Based Clinical Practice Guidelines (8th Edition), 2008, (12) does recommend routine prophylaxis with low molecular weight heparin (LMWH), low dose unfractionated heparin (LDUH), or optimally used bilateral graduated compression stockings (GCS) or intermittent pneumatic compression (IPC). The guidelines are based on moderate to low quality evidence and the strength of these recommendations is weak as there have been no randomized controlled trials.