Anaesthesia in the elderly
The elderly population continues to grow. As surgical intervention in disease processes becomes more aggressive, the anaesthetist is faced with an increasing number of elderly patients. Elderly patients should be approached with a clear understanding of ageing, how it occurs, how it affects specific organ systems, and how it may influence clinical care, when a patient is subjected to an operation. The ageing process is a multifactorial process, resulting in a decreased capacity for adaptation and producing a gradual decrease in functional reserve of many organ systems. This has significant effects on the physiological responses to surgical and pharmacological trespass faced during anaesthesia. Increasing age is associated with changes in the response to a wide variety of drugs. Changes in dose–response relationships may be as a result of changes in pharmacokinetics, pharmacodynamics, or a combination of both. One should realize that increasing age is associated with a large inter-individual variability in dose requirements. As such, it is important to carefully titrate the dose against the desired clinical effect in an older patient. Preoperative physical and mental state are the most important determinants of per- and postoperative morbidity and mortality. The number of co-morbidities increases with advanced age and as such, optimization of the medical condition is essential to reduce the morbidity and mortality.