L6 Flashcards
Inflammation
- A dynamic process of chemical and cytological reactions
- A response of vascularized tissues to infections and tissue damage
- Brings defense cells & molecules from the circulation to the infected sites
- A protective response that is essential for survival
Concept of inflammation started
3000 BC in Egyptian civilization(papyrus)
first person who put the 4 cardinal signs of inflammation
Roman celsus
in 19th century put the 5th sign of inflammation
German Virchow
said that inflammation isn’t a disease
Scottish hunter
described the process of phagocytosis
Russian Metchnikoff
describes histamine (inflammatory mediator)
20th century, Thomas Lewis
Inflammation results in:
Accumulation of leukocytes
Accumulation of fluid in extravascular tissue
Systemic effects
Inflammation aims
1- Elimination of the cause of cell injury
2- Elimination of the necrotic cells and tissue
3- Paves the way for repair
4- May lead to harmful results
Without inflammation
Infections would go unchecked
Wounds would never heal
Injured tissues might remain permanent festering sores
Excessive inflammatory reaction become the cause of disease:
Misdirected (autoimmune)
Immunological/hypersensitivity (allergies)
Prolonged (microbes resist eradication)
Anti-inflammatory drugs would control the
harmful sequelae of inflammation rather than interfering with its beneficial effects
Defective inflammation
is also responsible for serious illness as seen in cancer and immunocompromised patients
Five Classic Signs of Acute Inflammation
1- Heat (Calor) 2- Redness (Rubor) 3- Swelling (Tumor) 4- Pain (Dolor) 5- Loss of function (Functio Laesa)
Appendix
Appendicitis
Dermis
Dermatitis
Gallbladder
Cholecystitis
Duodenum
Duodenitis
Meninges
Meningitis
Causes of inflammation
Microbial infections: bacteria, viruses, fungi, parasites
Immunologic: hypersensitivity, autoimmune reactions
Physical agents: trauma, heat, cold, ionizing radiation
Chemical agents: acids, alkali, bacterial toxins, metals
Foreign material: sutures, dirt
Tissue necrosis: ischemic necrosis
Participants (the players)
White blood cells and platelets
Plasma proteins
Endothelial cells and smooth muscles of vessels
Extracellular matrix and stromal cells
Plasma proteins
Coagulation / fibrinolytic system
Kinin system
Complement system
Extracellular matrix and stromal cells
Mast cells, fibroblasts, macrophages & lymphocytes
Structural fibrous proteins, adhesive glycoproteins, proteoglycans, basement membrane