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Complement levels and C3 breakdown products in open-heart surgery: association of C3 conversion with the
Insights
The complement system plays a role in post-pericardiotomy syndrome (PPS) following heart surgery. Elevated C3 conversion products were found in PPS patients, suggesting complement activation contributes to this inflammatory condition.
Area of Science:
- Immunology
- Cardiovascular Surgery
Background:
- Post-pericardiotomy syndrome (PPS) is an inflammatory complication after open-heart surgery.
- The specific mechanisms driving PPS pathogenesis remain incompletely understood.
- The involvement of the complement system in PPS has not been extensively studied.
Purpose of the Study:
- To investigate the role of the complement system in the development of post-pericardiotomy syndrome.
- To measure complement component levels, hemolytic activity, and C3 breakdown products in patients undergoing open-heart surgery.
- To correlate complement activation markers with the occurrence of PPS.
Main Methods:
- Prospective study of 45 patients undergoing open-heart surgery.
- Serial measurement of complement (C) components (C3, C4, Factor B), total hemolytic complement activity, and C3 conversion products (C3bi, C3c, C3d) in plasma and serum.
- Immunofixation and rocket immunoelectrophoresis techniques used to detect C3 breakdown products.
- Comparison of complement activation markers between patients who developed PPS and those who did not.
Main Results:
- A transient reduction in C3 and C4 levels was observed on postoperative day two.
- Significantly higher levels of C3 conversion products were detected in patients who developed PPS during the second postoperative week (14.3%) compared to controls (4.5%).
- Reduced total hemolytic complement activity was noted in three PPS patients.
Conclusions:
- The findings suggest a role for complement activation in the inflammatory response during the late postoperative period after open-heart surgery.
- Complement system activation, particularly C3 conversion, appears to be associated with the pathogenesis of post-pericardiotomy syndrome.
- Further research into complement modulation could offer therapeutic strategies for PPS.
Abstract:
The role of the complement system in the pathogenesis of the post-pericardiotomy syndrome (PPS) was evaluated in a prospective study by measuring the levels of complement (C) components, total haemolytic complement activity and circulating C3 breakdown products in serial plasma and serum samples of 45 patients undergoing open-heart surgery. A consistent reduction in the levels of C3 and C4 but not of factor B was seen on the second post-operative day. During the second post-operative week the antigenic levels of each C component increased significantly. At this time six patients developed the post-pericardiotomy syndrome. Circulating C3 conversion products (C3bi and C3c) were demonstrated in the plasma samples from five of these patients by the immunofixation technique, the mean conversion percentage being 14.3 +/- 10.6. The samples from 15 of the 39 other patients also showed C3 conversion, but the mean percentage was significantly lower (4.5 +/- 6.1%, P less than 0.05). Before the second post-operative week C3 conversion was rare in both groups. The C3d levels of plasma samples, as detected by rocket immunoelectrophoresis, followed a similar pattern. Reduced total haemolytic complement activity was found in three patients suffering from the PPS. These results suggest a role for complement in the non-infectious, inflammatory response during the late post-operative period after open heart surgery, and especially in the post-pericardiotomy syndrome.