[Immunological implications of surgical intervention in critical and noncritical patients].

Immunological implications are important in every surgical operation, specially when it is necessary to remove the spleen. She plays an important role in immunological aspecific (filter, phagocytosis) and specific processes (production of IgM and regulation of T- and B-lymphocytic system). Splenectomy causes an immunodeficiency with frequent post-operative complications (the most important is OPSI). Each operated patient is considered generically immunodeficient because surgical trauma and anesthesiologic practice are at the base of immunological alterations (biological barriers, aspecific immunity, A.P.P., complement, specific immunity, NK cells). It's indispensable to know pathological situations that make "critical" the immunological state: caloric-proteic malnutrition, elderly (greater than 70 years old), immunosuppressive therapy, sepsis, shock, neoplasms. I. e.: a patient about seventy years old presents a reduced endocrine secretion of thymic hormone and, probably, a low synthesis of immunoglobulins. Besides the corticosteroids modify the answer of T-lymphocytes and NK cells. Sepsis induces metabolic and immunological alterations after early activation of humoral mediators, modified quantity and life of A.P.P., activation of complement, inhibition of cell-mediate immunity, modification of number and activity of haematic lymphocytes. Trauma induces a hypersecretion of corticosteroid, adrenalin, noradrenaline, glucagon with consequent hypercatabolism that causes malnutrition. The hormonal hypersecretion is a determining factor of reduced phagocytic activity (inhibited migration of neutrophils and monocytes), quantitative and qualitative alterations of complement, deficit of T-cells, hyporeactivity to skin test, depressed answer of antibodies to bacterial and viral antigens. Progressive neoplasms are characterized by modification of T-lymphocytes number, depressed macrophagic activity, hyporeactivity to skin tests.