ReviewSurgery induced immunosuppression
Introduction
Surgical operations cause a variety of immunological disturbances. With a few exceptions the overall picture is one of a generalised state of immunosuppression in the post-operative period. It would appear that the degree to which this occurs and its duration are determined in part by the magnitude of the initial surgical insult. The clinical consequences to patients as a result of this suppression are unclear. There are reports in the literature suggesting that it results in an increased incidence of post-operative wound complications and tumour progression. This review examines the effects of surgery and anaesthesia on components of the immune system, the mechanisms by which these effects may be mediated and the clinical implications of such immune disturbance. In addition we discuss strategies and novel therapies that can be used to modulate the immune system during surgery.
Section snippets
Surgery induced immunosuppression
Surgery induced immunosuppression is caused by the effect on the cellular components of the immune system. Surgery and trauma cause an increase in the total number of white blood cells circulating in the body.1However when critical individual leucocyte subpopulations are examined it seems that important groups are suppressed in both number and function. Circulating lymphocyte numbers fall peri-operatively2, 3, 4 and the extent and duration of this fall is related to the magnitude of the surgery.
Mechanisms of immunosuppression
Immune changes occurring peri-operatively are primarily as a result of surgical trauma and subsequent neuroendocrine responses. Activation of the hypothalamic–pituitary–adrenal axis (HPA) is the key response to stress and plays a central role in mediating the effect of surgery on the immune system.32, 33 Peri-operative stresses both physical and psychological result in the increased production of adrenocorticotropic hormone (ACTH) from the pituitary gland, and subsequent release of
Clinical consequences of surgery induced immunosuppression
The clinical consequences of peri-operative immunosuppression were documented as far back as 1911 when Graham reported that ether induced a reduction in bacterial phagocytosis increasing the risk of post-operative septic complications.65 Gaylord in 1916 showed an increased frequency of metastases from mammary carcinoma in mice following anaesthesia and blood loss.66 More recent studies also suggest that the immunological effects of surgery have both immediate and delayed consequences for
Measures to reduce immunosuppressive effect of surgery
An understanding of the mechanisms by which surgery induces immunosuppression allows for the implementation of certain measures to minimise negative consequences to patients. Efforts to reduce the immunosuppressive effects of surgery and anaesthesia must be initiated in the pre-operative period. These efforts should be focussed on minimising the neuroendocrine stress response associated with surgery. Effective emotional support and counselling as well as appropriate pre-medication use may help
Conclusion
Surgery induced immunosuppression has considerable implications for patients. It is associated with impaired wound healing and delayed post-operative recovery. Its implications for cancer patients are more profound, being associated with an increased incidence of cancer recurrence and reduced survival. In addition the effectiveness of many adjuvant treatments is dependent on the preservation of immune integrity in patients during and following resection of the primary tumour. An understanding
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