Every year, approximately 1,500,000 surgical procedures are performed in The Netherlands alone. After major surgery, the complication rate is conservatively estimated at 25%, with a rate of 15% for major complications. In these patients, the most important problems are a failure to timely detect developing complications and a failure to adequately rescue those patients. Currently, measurement of vital signs and standardized assessment of patient wellbeing are routinely performed intermittently for every 8-12 hours, which may lead to a failure to detect of patients with complications.