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Multiple organ dysfunction syndrome: past, present and future
1Department of Surgery, University of New Mexico School of Medicine, Albuquerque, NM, USA. dfry@salud.unm.edu
Abstract:
In the past, our approach to multiple organ failure in the injured or critically ill surgical patient was driven by attempts to simplify a complex process. Early studies focused on uncontrolled invasive infection (sepsis) as the driving force of multiple organ dysfunction syndrome (MODS). However, some patients with adequately controlled infection and those without sepsis nevertheless develop MODS and signs of systemic inflammation. This discrepancy led to investigations of systemic activation of inflammation by a wider variety of biological modulators than just infection. Despite the apparent involvement of biological modulators such as endotoxin, tumor necrosis factor, and interleukin-1 receptor in MODS, agents that neutralize these modulators have failed to thwart the progression of sepsis, septic shock, and organ failure. A new paradigm suggests that, in the critically ill patient at risk for organ failure, an integrated process propagates an excessive systemic inflammatory response and/or an inadequate compensatory anti-inflammatory response. Future studies should examine the balance between these two processes at the level of the individual patient with organ failure. Careful stratification of individual patient responses to inflammatory stressors may be an essential step for creating better strategies for therapeutic interventions that can restore balance between the pro-inflammatory and anti-inflammatory processes in the critically ill patient and possibly prevent organ failure.
Insights
Multiple organ dysfunction syndrome (MODS) in critically ill patients is complex. New research suggests an imbalance between inflammatory and anti-inflammatory responses, rather than just infection, drives MODS.
Area of Science:
- Critical care medicine
- Surgical pathology
- Immunology
Background:
- Historically, multiple organ failure in critically ill patients was attributed primarily to sepsis.
- However, multiple organ dysfunction syndrome (MODS) can occur even with controlled infection or without sepsis, indicating other contributing factors.
- Early research focused on infection as the main driver, but treatments targeting infection-related modulators have shown limited success.
Purpose of the Study:
- To explore the discrepancy between infection control and MODS development.
- To investigate the role of systemic inflammation beyond infection in MODS.
- To propose a new paradigm for understanding the pathophysiology of organ failure in critically ill patients.
Main Methods:
- Review of early studies on sepsis and MODS.
- Investigation into biological modulators beyond infection (e.g., endotoxin, TNF, IL-1 receptor).
- Conceptual shift towards an integrated inflammatory/anti-inflammatory response model.
Main Results:
- Infection alone does not fully explain MODS; systemic inflammation plays a significant role.
- Therapeutic agents neutralizing specific inflammatory modulators have not consistently prevented sepsis progression or organ failure.
- A new paradigm suggests an imbalance between excessive pro-inflammatory and inadequate anti-inflammatory responses is key.
Conclusions:
- MODS in critically ill patients results from an integrated process involving both excessive inflammation and insufficient anti-inflammation.
- Future research should focus on individual patient stratification based on inflammatory responses.
- Restoring the balance between pro-inflammatory and anti-inflammatory processes is crucial for preventing organ failure and improving therapeutic strategies.
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