Postoperative Complications in Cancer Patients Monitored With Intelligent Continuous Monitoring System

Inclusion Criteria: * Admission for elective major abdominal (gastrointestinal, gynecological, or urological) surgery with the primary aim of radical surgery/removing suspected cancer tissue. * At least two expected postoperative admission days * Laparotomy or laparoscopy procedure estimated to last more than 2 hours. * Co-enrolment of patients in other studies is acceptable but in studies involving interventions which potentially will affect the continuous monitoring of vital signs and/or the primary or secondary outcomes, an assessment of whether these patients can be co-enrolled in the WARD-RCT should be conferred with the WARD RCT steering committee. Exclusion Criteria: * Patient expected not to cooperate with study procedures * Allergy to study materials (silicone, plaster) * Impaired cognitive function (in uncertain cases assessed by a Mini Mental State Examination score \< 24). (Protocol Appendix E) * Patients with a pacemaker or Implantable Cardioverter Defibrillator (ICD) device * Inability to give informed consent * Patients with planned hyperthermic intraperitoneal chemotherapy (HIPEC) procedure or two-stage resections (two-stage hepatectomy, two-stage resection of malignant colorectal obstructions, etc.)