Obesitas Surgery Mortality risk score: proposal for a clinically useful score to predict Mortality risk in patients undergoing gastric bypass.

Http://www.ncbi.nlm.nih.gov/pubmed/17893494

The OS-MRS assigns 1 point to each of 5 pre operative variables, including body mass index ≥50 kg/m2, male gender, hypertension, known risk factors for pulmonary embolism (previous thromboembolism, pre operative vena cava filter, hypo ventilation, pulmonary hypertension), and age ≥45 years. Patients with total score of 0 to 1 are classified as 'A' (lowest) risk group, score 2 to 3 as 'B' (intermediate) risk group, and score 4 to 5 as 'C' (high) risk group.