Elsevier

The Surgeon

Volume 9, Issue 1, February 2011, Pages 38-43
The Surgeon

Review
Surgery induced immunosuppression

https://doi.org/10.1016/j.surge.2010.07.011Get rights and content

Abstract

Surgery and anaesthesia result in a variety of metabolic and endocrine responses, which result in a generalised state of immunosuppression in the immediate post-operative period. Surgery induced immunosuppression has been implicated in the development of post-operative septic complications and tumour metastasis formation. In addition the effectiveness of many treatments in the adjuvant setting is dependent on a functioning immune system. By understanding the mechanisms contributing to surgery-induced immunosuppression, surgeons may undertake strategies to minimise its effect and reduce potential short-term and long-term consequences to patients.

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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