QUALITY: SAFE CARE Potentially Preventable Adverse Events and Complications of Care in Hospitals Among Medicare Beneficiaries, 2004–2005 Percent *Surgical patients with postoperative pneumonia, urinary tract infection (2005 only), or venous thromboembolic event ** Patients with serious bleeding associated with intravenous heparin, low molecular weight heparin, or warfarin, or hypoglycemia associated with insulin or oral hypoglycemics. Data: M. Pineau, Qualidigm analysis of Medicare Patient Safety Monitoring System. Source: Commonwealth Fund National Scorecard on U.S. Health System Performance, 2008 1