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95 terms

14- Inflammation

Exam 2
STUDY
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What is inflammation?
reaction of vascularized living tissues to injury
What are the characteristics of inflammation?
- involves changes in vascular bed, blood, connective tissue
- intended to eliminate irritant and repair damaged tissue
What are the signs of inflammation?
redness, heat, swelling, pain and loss of function
What is the purpose of inflammation?
- contain and isolate an injury
- destroy invading microorganisms anr/or inactivate toxins
- acheive healing and repair
What are the 3 outcomes of inflammation?
- ideal conditions return to normal
- intense inflammatory response in an attempt to separate the injured tissue
- failure to eliminate cause of inflammation
What is scar tissue a consequence of?
a lot of inflammation and repair
What happens in ideal inflammatory reactions?
- elimination of the source of injury
- resolution of inflammatory process
- restoration of normal tissue architecture and physiologic functions
What occurs in an intense inflammatory response?
the body attemps to isolate the inflammatory process by a formation of a wall/capsule
What happens if there is failure to eliminate the causative agent?
- persistence of inflammatory cells and formation of scar tissue
What kind of tissue does inflammation occur in?
only in living tissue
What is the result of anaphylaxis?
it is more harmful than the initial stimulus
How do you classify inflammation?
- extent
- duration
- distribution
- type of exudate
- tissue/organ affected
what does a granulomatous exudate mean?
in chronic inflammation
What does duration have to do with clinical signs?
nothing
What are the duration classifications of inflammation?
- peracute
- acute
- subacute
- chronic
what are the main characteristics of peracute inflammation?
- caused by a potent stimulus
- the animal has no time to respind
- less common
What is the duration of peracute inflammation?
0-4 hours
What are the clinical signs of peracute inflammation?
shock and sudden death
What is the vascular involvement of peracute inflammation?
- hyperemia
- slight edema
- minimal hemorrhage
What are the inflammatory cells seen in peracute inflammation?
- not numerous
- few leukocytes
What is the duration of acute inflammation?
begins within 4-6 hours
What is the vascular involvement in acute inflammation?
- active hyperemia
- edema
- occasional fibrin thrombi within vessels
what are the predominant cells in acute inflammation?
neutrophils, sometimes with lymphocytes and plasma cells
What are the clinical signs of acute inflammation?
- calor, rubor, tumor, dolor, and loss of function
What is the lymphatics role in acute inflammation?
moving away the exudate
- can lead to acute regional lymphadentitis
What is inflammation of the lymphatics?
lymphangitis
What is inflammation of the lymphnodes?
lymphadenitis
What is the problem with lymphadenopathy?
do not know if the inc. in size is due to inflammation or neoplasia
What is subacute inflammation?
defined as a gradual change between acute and chronic
- is used with the inflammatory response does not include reparative responses such as fibroplasia and angiogenesis
What is the duration of subacute inflammation?
a few days to a few weeks
What is the vascular involvement in subacute inflammation?
- decline in magnitude of the vascular changes
- less hemorrhage, hyperemia, and edema
What are the cells of subacute inflammation?
neutrophilic with lymphocytes macrophages and plasma cells
What is chronic inflammation?
result of persistent inflammatory stimulus in which the host has failed to completely eliminate the causative agent
What is chronic inflammation usually accompanied by?
immune response
What is chronic inflammation characterized by?
repair:
- fibrosis
- parenchymal regeneration
What is the vascular involvement in chronic inflammation?
chracterized by proliferation of cappilaries and small blood vessels resulting in hemorrhage and congestion
What are the predominant cells in chronic inflammation?
lymphocytes, macrophages, plasma cells, and fibroblasts
What are the clinical signs of chronic inflammation?
prolonged duration of an inflammatory process
What is chronic active inflammation?
chronic inflammation may be accompanied by acute exacerbation in which the tissues exhibit all of the usual characteristics of chronicity, with features of acuteness superimposed
What is the duration of chronic active inflammation?
long period with exacerbations
what are the cells present in chronic active inflammation?
neutrophils, inflammatory cells associated with chronic inflammation, and host responses such as fibroplasia and angiogenesis
What is focal inflammation?
single abnormality or inflamed area within a tissue
What is keratitis?
inflammation of the cornea
What is multifocal inflammation?
arising from or pertaining to many foci
What is locally extensive inflammation?
involves a considerable zone of tissue within an inflamed organ
In lungs how does inflammation present when bacteria come from the blood?
multifocal or diffuse
In lungs, how does inflammation present when bacteria comes from the air?
locally extensive
what is diffuse inflammation?
the entire tissue is involved
What etiologies normally cause diffuse lesions?
viral or toxicity
What are common types of exudate in inflammation?
-serous
- suppurative
- fibrinous
What is exudation?
escape of fluid, proteins and blood cells from the vascular system into the interstitium or body cavities
What is exudate?
inflammatory extravascular fluid that has a high protein conc., much cellular devris, and a specific gravity above 1.020
What is a transudate?
an ultrafiltrate of blood plasma and results from hydrostatic imbalances across the vascular endothelium
- low protein content
- specific gravity less than 1.020
What is an example of a transudate?
hydrothorax
What is an example of a exudate?
pyothorax
What is edema?
an excess of fluid in the interstitial tissue or serous cavities
- can be an exudate or transudate
What kind of edema is inflammatory edema?
exudate
What is serous exudation?
inflammatory process in which the outpouring of thin fluid, originating from plasma or secretions of mesothelial cells, occurs in tissues in the absence of a prominent cellular response
What is an example of serous exudation?
blisters caused by heat or trauma
What is the gross appearance of serous exudate?
yellow, straw-like color, fluid commonly seen in very ealy stages of inflammation
- thin and watery
- ulceration will follow the rupture of a vesicle
What is erosion?
a lesion in which the epithelial surface is denuded above the basement membrane
What is an ulcer?
a local defect of the surface of an organ or tissue in which the epithelial surface is denuded beyond the basement membrane
What is an epidermal erosion?
moist, circumscribed, usually depressed lesion due to loss of all or part of the epidermis. Is shallow and does not penetrate into the dermis
What do epidermal erosions often result from?
eruptions of vesicles and bullae
What is a skin ulcer?
a circumscribed area of skin loss extending through the epidermis and at least part of the dermis
What is a vesicle?
- blister
- a sharply circumscribed, elevated lesion that is less than 5mm in diameter containing serous fluid
What is fibrinous exudation?
severe injury to endothelium and basement membranes results in leakage of large plasma proteins including fibrinogen, which polymerizes perivascularly as fibrin
What is the gross appearance of fibrinous inflammation?
yellow-white, or pale tan, stringy, shaggy meshwork which gives a rough irregular appearance to the tissue surfaces
- friable material peels off easily
What is the duration of fibrinous inflammation?
- acute process, can form in seconds
What is suppurative exudation?
cosisting of or containg pus, assosiated with the formation of pus
What is pus?
a liquid inflammation product composed of:
- accumulated dead cells
- variable numbers of viable cells (neutrophils)
- fluid added by the inflammatory edema-forming process
If fluid is prominent, what will the necrosis be classified as?
liquefactive
What is suppuration?
the process by which pus is formed
- implies that neutrophils and proteolytic enzymes are present and the necrosis of host tissue cells has occured
What is an abscess?
is a circumscribed (partially walled off) collection of pus. A localized form of suppurative inflammation
What are suppurative lesions often caused by?
bacteria
What is the gross appearance of an abscess?
is yellow-white to gray-white and varies from watery to viscous depending on the fluid content
What is osteomyelitis?
inflammation of the bone and bone marrow
What is fibrinopurulent exudate?
used to classify an inflammatory process in which neutrophils and fibrin are abundant
What is the duration of granulomatous inflammation?
always is chronic
What is granulomatous inflammation?
an inflammatory response characterized by the presence of lymphocytes, macrophages, and plasma cells with the predominant cell being the macrophage
What is a granuloma?
macrophages are clustered on a characeristic elliptical formation around the causative etiologic agent, or around a central necrotic area, or simply as organized nodules
What type of cell besides macrophages are characteristic of granulomas?
multinucleated giant cells
What is the etiology of granulomatous inflammation?
usually some non-digestible organism or particle which serves as a chronic inflammatory stimulus, and induces delayed- type hypersensitivity
What microorganisms cause granulomatous inflammation?
mycobacterium, actinomyces, blastomyces, coccidioides
What are some noninfectious agents that cause granulomatous inflammation?
mineral oil. complex polysaccharides, foreign bodies
What is necrotizing inflammation?
necrosis is the main feature and exudation is minimal
What is hemorrhagic inflammation?
inflammation in which the main feature is hemorrhage
What is mucopurulent or catarrhal inflammation?
the inflammatory exudate is composed of mucus and pus
What are polymorphonuclear leukocytes?
neutrophils, eosinophils, basophils, and mast cells
What are mononuclear cells?
lymphocytes, plasma cells, monocytes, macrophages, and platelets
how long does it take for a neutrophil to mature in the bone marrow?
2 weeks
What is the purpose of neutrophils?
to eliminate microorganisms, tumor cells, and foreign material
When are eosinophils most abundant?
in diseases of immunologic, parasitic, or allergic origin
What is major basic protein?
component of eosinophil granules
- is strongly toxic to parasites as well as other kinds of cells
What is the life span of a macrophage?
30-60 days