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Systemic inflammatory response syndrome SIRS and Multiple organ dysfunction syndrome MODS
Systemic inflammatory response syndrome
SIRS
and
Multiple organ dysfunction syndrome MODS
Jan Janota, MD, PhD. Department of Pediatrics and Neonatology Novorozenecké odd. s JIP Thomayer University Hospital, Prague Fakultní Thomayerova nemocnice s poliklinikou, Praha 4 E-mail: [email protected]
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Where to find this text
Internet:
http://patf.lf1.cuni.cz/
Study in English
Study materials
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Systemic inflammatory response syndrome – SIRS and Multiple organ dysfunction syndrome – MODS 1 Response to the pathogenic factors 2 Definition of the inflammation 3 Systems responsible for inflammatory response 3.1 Endothelial cells 3.2 Platelets 3.3 Leucocytes 3.4 Plasmatic hemocoagulation system 3.5 Complement 4 Local inflammatory response 5 Systemic inflammatory response 6 Systemic inflammatory response syndrome (SIRS) 7 Multiple organ dysfunction during SIRS – primary and secondary MODS 8 Pathophysiology of SIRS 9 Diagnosis of SIRS 10 Relationship between SIRS and sepsis Goals: 1. principle of SIRS 2. relationship SIRS/MODS 3. pictures
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SIRS/MODS: what does it mean for patient?
1.critically ill ICU patient 2.objective patient assessment (activity of SIRS)
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1 Response to the pathogenic factors • Reaction to the stimulus - basic activity of the living organisms. • Jeopardizing stimulus - defensive reaction. Defensive systems: • Stress reaction - global neurohumoral defensive changes • Inflammation - partially autonomous defense of vascularized
tissue
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2 Definition of the inflammation • Inflammation is system of the defensive reactions of the
vascularized tissues of the organism to the pathogenic insult of different origin. The goal of inflammation is to eliminate the cause, to eliminate destructed tissue and, through regeneration or repair, to restore metabolism and function of the organs to the state of dynamic balance.
Insult • biologic (microorganisms) • physical (mechanical insult, radiation) • chemical (poisons, acids) • metabolic (hypoxia, malnutrition) • immunologic (autoimmune diseases) • endogenic disorders of neurohumoral regulation
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Types of the inflammation Localization of the inflammation • local • systemic Regulation of the inflammation • defensive • auto aggressive Defensive inflammation • localization • regulation
Auto aggressive inflammation • dysregulation • delocalization
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3 Systems responsible for inflammatory response
Cooperation of the most important inflammatory response systems.
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3.1 Endothelial cells Physiologic conditions • antithrombogenic vessel wall • local regulation of vascular tension • permeability of the vascular wall
During defense after insult • changes in vessel tension • adhesion of cells and proteins • thrombogenic potential for hemostasis • increase permeability of the vessel wall
for proteins • regulation of leucocyte migration to
interstitium
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Vasodilatatory and antithrombotic mediators • NO • prostacycline (PGI2 ) Vasoconstrictive and prothrombotic mediators • endothelin-1 • thromboxan A2 Levels of the endothelium dysfunction • Stimulation - fast, reversible process - endothelial
contraction • Activation (during inflammation) - through (TNF-α a IL-1β),
irreversible changes
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3.2 Platelets Physiologic conditions • creation of primary hemostatic
plug if vessel integrity broken • platelet surface and mediators -
reactions of plasmatic hemocoagulation system
Platelets after activation • discoid to spheric shape • pseudopodia • adhesion and aggregation • release of mediators
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3.3 Leukocytes
3.3.1 Mononuclear phagocytes • monocytes of peripheral blood • tissue macrophages • both able to perform phagocytosis • macrophages - main producers of TNF-α a IL-1β
3.3.2 Polymorfonuclear leucocytes • concentration in the site of insult • adhesion to stimulated endothelial cells • penetration to interstitium Phagocytosis Cytotoxic potential • reactive oxygen intermediates • hydrolytic enzymes • antibacterial proteins
3.3.3 Histiocytes, basophils 3.3.4 Eozinophils 3.3.5 Lymfocytes T and B, Natural killer cells (NK-cells)
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Regulatory function of the leukocytes Role in the inflammatory response • executive • signal • regulatory
Communication among inflammatory systems • surface membrane receptors • mediators Mediators • Cytokines: proteins (released by different cells), which through
interactions with specific receptors regulate functions of target cells.
During inflammation • proinflammatory cytokines IL-1β a TNF-α. released by activated
mononuclear cells • antiinflammatory cytokines IL-4, IL-10 a IL-13
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3.4 Plasmatic hemocoagulation system • activation via tissue factor expressed
by activated mononuclear cells and endothelial cells
3.5 Complement
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4 Local inflammatory response Symptoms of the local inflammation • rubor (color) • calor (temperature) • tumor (edema) • dolor (pain) • functio laesa (dysfunction)
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5 Systemic inflammatory response • Systemic insult leads to systemic inflammatory
response. • Systemic inflammatory response may not be
necessarily autoaggressive. • Inflammatory processes are delocalized, if
dysregulation is than added – auto aggressive inflammation starts.
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6 Systemic inflammatory response syndrome (SIRS)
Definition • Delocalized and dysregulated inflammation process of
high intensity. It leads to disorders of microcirculation, organ perfusion and finally to secondary organ dysfunction.
• This secondary dysfunction is not due to primary insult, but due to autoaggressive systemic inflammatory response of the organism to the primary insult.
• This systemic inflammatory response syndrome (SIRS), leads without therapeutic intervention to multiple organ dysfunction syndrome (MODS) and death.
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# - normal reactivity * - decreased reactivity + - increased reactivity ‡ - auto aggressive systemic inflammation
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7 Multiple organ dysfunction during SIRS: primary and secondary MODS
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8 Pathophysiology of SIRS
Insult • hypoxic-reperfusion damage • infection (endotoxin, other microbial toxins or microorganisms) • primary mediators -histamin, anaphylatoxins C3a, C5a • complexes antigen-antibody • thrombin a plasmin (DIC)
Defensive reactions • First detected signs of defense after insult are local and
generalized hemodynamic changes (vasodilatation, vasoconstriction).
Regulation of hemodynamic changes • systemic sympathic-adrenal activation (changes in organ blood
distribution of minute volume) • local microcirculatory changes - mediators produced by
endothelial cells and other inflammatory systems (NO, PGI2 x endothelin-1, thromboxan A2)
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Endothelial cells reaction Endothelial stimulation • Key process in development of microcirculatory disorders • release of protective mediators (vasodilatatory and antithrombotic) • contraction of endothelial cells and P-selectin expression (adhesion of
neutrophils) • aged endothelial cells desquamation, intracellular gaps, disturbances of
endothelial surface • release of vasoconstrictive and prothrombotic mediators • Result of stimulation process - thrombogenic vascular intima with
increased permeability. Reversibility • Fast stimulation of endothelium by primary mediators and development
of acute inflammatory response is process not dependent on proteosynthesis. Endothelial cells are rapidly active, however, this activation without further stimulation disappears within few minutes.
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If insult persists (hours): Activation of other inflammation components • activation of mononuclear cells - release of TNF-α
and IL-1β • adhesive receptors on mononuclear cells and
tissue factor release • endothelium activation: endothelial cells
activated by cytokines - release of adhesive receptors, tissue factor expression
• endothelial cytoskeleton rebuilt to irreversible active state
• chemotaxis of neutrophils - activation (reactions worsening hypoxia)
• interstitial edema and microthrombotization • edema compresses lymphatic and blood stream • anaerobic metabolism of tissue cells (decrease of
pH - optimal for hydrolytic enzymes) • hypoxia and organ dysfunction
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Reversibility
• Activation of mononuclear cells and release of TNF-α a IL-1β is inhibited by corticosteroids released after activation of hypothalamic-adrenal stress reaction. Those acute microcirculatory disorders can be reversible, if the insult is eliminated and appropriate intensive care started.
Tissue damage
The degree of reversibility of secondary MODS is influenced by: • necrotic tissue damage • changes of vessel wall caused by
proinflammatory cytokines • during chronic process - proliferation of
less valuable cells (fibroblasts) • apoptosis (induced during SIRS)
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9 Diagnosis of SIRS
Diagnostic criteria - a weak part of SIRS theory. • Official diagnostic criteria SIRS (Tab.) are not
able to cover dynamics and degree of SIRS.
Symptoms Assessed factors
Body temperature >38oC or <36oC
Pulse rate >90 /min
Rate of breathing or PCO2 (arterial blood)
Frequency of breathing >20 /min PaCO2 <32 mm Hg
White blood count or I/T ratio
>12 000/mm3 or <4 000/m3 >10%
SIRS diagnosis Presence of SIRS indicated by presence of minimum 2 of described signs. (Bone et al., 1992).
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Contemporary medical/intensive care • tachycardia and tachypnea pharmacologically
influenced • published SIRS criteria - low level
inflammatory response (may not be autoaggressive)
• goal: diagnostic criteria of autoaggressive SIRS
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10 Relationship between SIRS and sepsis • Developed noninfectious SIRS usually proceeds
into sepsis. • Sepsis is most frequent example of severe
SIRS caused by infectious insult. • Sepsis is a part of SIRS (Pic.). Sepsis development: • disorders of intestinal wall microcirculation
during SIRS - translocation of endotoxin and bacteria
• invasion of microorganisms to damaged tissues
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Relationship between SIRS and sepsis
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Goals: 1. principle of SIRS 2. relationship SIRS/MODS 3. pictures
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Questions:
1. 2 types of reacions of living organisms to the pathogenic stimuli
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2. 5 Systems responsible for inflammatory response
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3. Describe SIRS (localization, regulation)
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4. Insult, MODS, SIRS (Picture)
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5. SIRS and MODS development (Picture)
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6. SIRS and sepsis (Picture)
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Thank you for your attention!