cme: sepsis pathogenesis - host factors
TRANSCRIPT
By:
Dr JAMI SWATHI
Under the guidance of Prof Dr CHENTHIL
SEPSIS
PATHOGENESIS-
HOST DERIVED MECHANISMS
WHAT IS SEPSIS???.....
Sepsis is the systemic maladaptive response of the host organism to the invasion of normally sterile tissue, fluid or body cavity by pathogenic or potentially pathogenic microorganisms
HOST RESPONSE
Recruitment of inflammatory cells
Cytokine release
Activation of coagulation system
Neutrophil- endothelial cell interactions
Role of Nitric Oxide
RECRUITMENT OF INFLAMMATORY CELLS
CYTOKINES
Pro inflammatory cytokines: predominate in the early phases of sepsis
Anti inflammatory cytokines: prevail in the later phase
ROLE OF LYMPHOCYTES
Participate mainly in the late phase of sepsis
Play a role in the production of both pro inflammatory & anti- inflammatory cytokines
CD4 lymphocytes play a major role
Outcome of sepsis depends nature of the lymphocyte response (expression of Th1 or Th2)
COAGULATION SYSTEM Extrinsic pathway is predominantly activated
activation of intravascular coagulation results in microthrombi formation
multi organ failure
NEUTROPHIL- ENDOTHELIAL CELL INTERACTIONS
• Neutrophil activation & degranulation exposes the endothelium to reactive O2
species, NO & proteases
• leads both to microbial clearance & diffuse endothelial injury
NITRIC OXIDESynthesized in the presence of TNF-α, IL-1,
LPS
Initiates vasodilatation
Responsible for increased neutrophil and platelet adherence
Intracellular killing
Lipid peroxidation
Enzyme inhibition
THANK YOU