title: A study of pulmonary embolism after abdominal surgery in patients undergoing prophylaxis.
abstract: OBJECTIVE
  To determine risk factors for pulmonary embolism and estimate effects and benefits of prophylaxis.
  
  
  METHODS
  We included 78 patients who died subsequently to a pulmonary embolism after major abdominal surgery from 1985 to 2003. A first, retrospective analysis involved 41 patients who underwent elective surgery between 1985 and 1990 without receiving any prophylaxis. In the prospectively evaluated subgroup, 37 patients undergoing major surgery between 1991 and 2003 were enrolled: all of them had received a prophylaxis consisting in low-molecular weight heparin, given subcutaneously at a dose of 2850 IU AXa/0.3 mL (body weight < 50 kg) or 5700 IU AXa/0.6 mL (body weight > or = 50 kg).
  
  
  RESULTS
  A higher incidence of thromboembolism (43.9% and 46.34% in the two groups, respectively) was found in older patients (> 60 years). The incidence of pulmonary embolism after major abdominal surgery in patients who had received the prophylaxis was significantly lower compared to the subjects with the same condition who had not received any prophylaxis (P < 0.001, OR = 2.825; 95% CI, 1.811-4.408). Furthermore, the incidence of pulmonary embolism after colorectal cancer surgery was significantly higher compared to incidence of pulmonary embolism after other abdominal surgical procedures. Finally, the incidence of pulmonary embolism after colorectal cancer surgery among the patients who had received the prophylaxis (11/4316, 0.26%) was significantly lower compared to subjects undergoing a surgical procedure for the same indication but without prophylaxis (10/1562, 0.64%) (P < 0.05, OR = 2.522; 95% CI, 1.069-5.949).
  
  
  CONCLUSIONS
  Prophylaxis with low molecular weight heparin is highly recommended during the preoperative period in patients with diagnosis of colorectal cancer due to high risk of pulmonary embolism after elective surgery.
authors.affiliation: Clinic of Surgery, Institute of Digestive Diseases, Clinical Center of Serbia, Belgrade, Republic of Serbia.
authors.forename: Mirko D
authors.initials: MD
authors.lastname: Kerkez
authors.forename: Dorde M
authors.initials: DM
authors.lastname: Culafic
authors.forename: Dragana D
authors.initials: DD
authors.lastname: Mijac
authors.forename: Vitomir I
authors.initials: VI
authors.lastname: Rankovic
authors.forename: Nebojsa S
authors.initials: NS
authors.lastname: Lekic
authors.forename: Dejan Z
authors.initials: DZ
authors.lastname: Stefanovic
mesh_terms: D000328:Adult; D000368:Aged; D013505:Digestive System Surgical Procedures / Q000009:adverse effects*; D005260:Female; D006495:Heparin, Low-Molecular-Weight / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology / Q000401:mortality; D011655:Pulmonary Embolism / Q000209:etiology* / Q000401:mortality / Q000517:prevention & control*; D012189:Retrospective Studies; D012307:Risk Factors; D013923:Thromboembolism / Q000209:etiology / Q000401:mortality / Q000517:prevention & control
chemical_list: D006495:Heparin, Low-Molecular-Weight