Introduction and epidemiology
Perioperative complications during non-cardiac surgery depend on the condition of the patient prior to surgery, the prevalence of co-morbidities, and the magnitude, duration, and timing of the surgical procedure. Cardiac complications most frequently arise in patients with documented or asymptomatic ischaemic heart disease, left ventricular dysfunction, valvular heart disease, and arrhythmias, including the presence of a pacemaker or implantable cardioverter defibrillator, when they undergo surgical procedures that are associated with prolonged haemodynamic and cardiac stress. The increasing ageing of the population has a major impact on perioperative patient management. The number of elderly patients with co-morbidities undergoing surgery increases and new surgical and anaesthesia techniques allow surgeons to operate on patients who were previously declined. In addition, the life expectancy of children with congenital heart disease has improved. Hence, this population increasingly seeks medical attention for other illnesses, adding a rising number of patients who will undergo non-cardiac surgeries. Reduction of peri- and postoperative risk in relation to non-cardiac surgery requires a practical, stepwise evaluation of the patient that integrates clinical risk factors and test results with the estimated stress of the planned surgical procedure.