Multiple organ dysfunction syndrome (MODS)
The development of MODS is a logical consequence of the exhaustion of the body's compensatory mechanisms in shock. Amidst progressive tissue hypoxemia, cells are forced to switch to the anaerobic pathway of oxidation—glycolysis.
As a result of this process, lactic acid actively accumulates in tissues. This leads to severe lactic acidosis, which becomes the direct cause of the patient's death in the terminal stage of shock.
DIC syndrome
Disseminated intravascular coagulation (DIC syndrome) occurs due to severe disorders in the hemostatic system triggered by vascular endothelial injury. Clinically, this syndrome manifests as a triad of signs against the background of shock itself: massive hemorrhages, generalized thrombosis, and multiple organ dysfunction.
The pathogenesis of DIC syndrome includes several stages:
- Active thrombosis in the microvasculature, which critically exacerbates degenerative processes in vital organs.
- Development of consumption coagulopathy: a progressive decrease in the pool of blood clotting factors and thrombocytopenia.
- A sharp increase in the anticoagulant potential of blood due to the circulation of fibrin degradation products (FDPs) and blockade of the reticuloendothelial system (RES).
Together, these factors lead to the development of profuse, practically intractable bleeding.
Causes of mortality and prognosis
The prognosis for a fully developed clinical picture of shock is generally unfavorable. It directly depends on the severity of the shock state, the presence of hemorrhagic syndrome, and the rate of progression of fatal complications. Mortality from the onset of DIC syndrome alone ranges from 40% to 60%.
The direct causes of death in patients with shock and DIC syndrome most frequently include:
- Acute renal failure (ARF).
- Acute respiratory failure (RF).
- Massive hemorrhages into internal organs (especially the brain and adrenal glands).
- Development of irreversible coma.
In specific types of shock, such as septic or burn shock, the prognosis is further worsened by the high risk of infection, development of generalized sepsis, and the onset of infectious psychoses against the background of encephalopathy.
Class and exam questions
What is the direct cause of death in MODS?
Severe lactic acidosis developing due to the shift of cells to anaerobic glycolysis under conditions of tissue hypoxia.
What are the main clinical manifestations of DIC syndrome?
Includes four key manifestations: the shock itself, massive hemorrhages, thrombosis, and the development of multiple organ dysfunction.
Why does unquenchable hemorrhage occur in DIC syndrome?
This is the result of consumption thrombocytopenia, decreased clotting factors, and increased anticoagulant potential (accumulation of fibrin degradation products).
What is the mortality rate when DIC syndrome develops against the background of shock?
Mortality in such cases reaches 40–60%.
What else to study on this topic
- Pathogenesis of vascular endothelial injury in shock
- Compensation mechanisms in early stages of shock
- Specifics of complications in septic and burn shock
- The role of the reticuloendothelial system (RES) in hemostasis
- Diagnostic criteria for multiple organ dysfunction syndrome
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