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Tissue injury and the inflammatory response to pediatric cardiac surgery with cardiopulmonary bypass: a descriptive
M S Chew1, I Brandslund, V Brix-Christensen
1Department of Anesthesia & Intensive Care, Aarhus University Hospital, Denmark. mchew@iekf.au.dk
Insights
Pediatric cardiac surgery with cardiopulmonary bypass shows a defined anti-inflammatory response and tissue injury, but variable pro-inflammatory cytokine release. Interventions like methylprednisolone and modified ultrafiltration did not show immediate cytokine reduction or rebound effects.
Area of Science:
- Pediatric cardiac surgery
- Cardiopulmonary bypass (CPB)
- Inflammatory response
Background:
- Limited data exists on pediatric inflammatory responses post-cardiac surgery with CPB beyond 24 hours.
- Understanding anti-inflammatory cytokines and tissue injury extent is crucial.
- This study investigated these responses in uncomplicated pediatric cardiac surgery using methylprednisolone and modified ultrafiltration (MUF).
Purpose of the Study:
- To describe the inflammatory and tissue injury responses in children undergoing cardiac surgery with CPB.
- To evaluate the impact of methylprednisolone and MUF on these responses.
- To analyze cytokine profiles, complement activation, coagulation, and tissue injury markers up to 48 hours postoperatively.
Main Methods:
- Blood samples collected up to 48 hours postoperatively.
- Measured cytokines (TNF-α, IL-6, IL-1β, IL-10, IL-1ra), complement (C3d, C4d), coagulation markers (F1+2, ATIII), neutrophil elastase, and tissue injury markers (CK, LDH, ALT, amylase, GGT).
Main Results:
- Pro-inflammatory cytokine release was variable, while the anti-inflammatory response was clear.
- Cytokine levels did not decrease immediately after MUF and showed no rebound.
- Coagulation system was activated, but complement was not. C-reactive protein showed a late release.
- Biochemical markers confirmed tissue injury without hepatic or pancreatic dysfunction.
Conclusions:
- Uncomplicated pediatric cardiac surgery patients exhibited well-defined anti-inflammatory and tissue injury responses.
- Pro-inflammatory cytokine release was variable.
- Coagulation activation occurred without complement activation.
- MUF did not lead to immediate cytokine reduction or subsequent rebound effects.
Background:
There are few detailed descriptions of the inflammatory response to cardiac surgery with cardiopulmonary bypass (CPB) in children beyond 24 h postoperatively. This is especially true for the antiinflammatory cytokines and the extent of tissue injury. The aim of the current study was to describe the inflammatory and injury responses in uncomplicated pediatric cardiac surgery with CPB, where methylprednisolone and modified ultrafiltration (MUF) were used.
Methods:
Blood samples were collected up to 48 h postoperatively. Cytokines (tumor necrosis factor-alpha and interleukin-6, -1beta, -10, and -1ra), complement (C3d and C4d) and coagulation system (prothrombin activation fragments 1 and 2 and antithrombin III) activation, neutrophil elastase, and the resulting tissue injury (creatine kinase, lactate dehydrogenase, alanine transaminase, amylase, and gamma-glutamyl transferase) were measured.
Results:
The proinflammatory cytokine release varied widely, in contrast to a clear-cut antiinflammatory response. Cytokine concentrations did not decrease immediately after MUF, and no rebound increases later in the postoperative period were observed. The coagulation system, but not complement, was activated. There was a late release of C-reactive protein. Tissue injury could be quantified biochemically without evidence of hepatic or pancreatic dysfunction.
Conclusion:
In this group of uncomplicated subjects, the antiinflammatory cytokine and tissue injury responses were well defined, in contrast to a variable proinflammatory cytokine release. This was accompanied by activation of the coagulation system but not of complement. Concentrations of inflammatory mediators did not decrease immediately after MUF, and there was no evidence for rebound release later in the postoperative period.