resp quiz Flashcards
what does the upper resp tract consist of?
nasal cavity
sinuses
nasopharynx
larynx
what are the three function divisions of the resp system?
conduction
transitional
exchange
what does the lower resp tract consist of?
trachea
lungs
what is the conducting system made up of?
nasal cavity
sinuses
nasopharynx
larynx
trachea
bronchi
what is the transitional division made up of?
bronchioles
what is the exchange division made up of?
alveoli
what are the nasal turbinates (bone), nasal septum, trachea, and bronchi (cartilage) all lined with?
ciliated pseudo stratified columnar epithelium and goblet cells which helps coat in mucus
what are the defenses of the conducting portion of the resp system?
-bony nasal turbinates (increases surface area for forge in debris to get trapped)
-normal bacterial flora (outcompete pathogenic microbial colonization)
-mucocililary appartus
-mechanisms of clearance (cough, sneeze, phagocytosis)
where does the mucociliary apparatus extend from?
bronchi to the pharynx
explain the mechanism of the mucociliary apparatus
there is a gel layer that is produced by the goblet cells and submucosal glands which is called the gel layer, that entraps the foreign debris or particles and lining the bronchial wall are cilia that are moving through the sol liquid layer that are transporting the mucus towed the pharynx to get swallowed or coughed out
what do cells in the nose, trachea, bronchi, and bronchioles secrete in order for defense
secreted antimicrobial products (lysozymes, antibodies) and mucus to entrap/neutralize pathogens and make them less apt to disease
cell defense at the bronchial bifurcation
antigen presenting cells in the region phagocytose and transport particles to bronchiole-associated lymphoid tissue (BALT)
what are factors impairing pulmonary defense
-viral (primary cause of infection_
-toxic gases
-immunodeficiency
-other factors (endotoxemia, uremia, dehydration, etc)
what are the main routes of entry?
-aerogenous (inspired air)
-hematogenous (septicemia, bacteriemia, parasites)
-direct extensions (penetrating wounds)
what are the three congenital disease of the upper respiratory tract
palatoschisis
choanal atresia
ciliary dyskinesia
what are the anatomic features that contribute to brachycephalic airway syndrome
-stenotic nares
-elongated soft palate
-everted laryngeal saccules
-hypoplastic trachea +/- collapsed trachea
(all of these cause airway obstruction)
empyema
accumulation of pus within the guttural pouch
eustachitis
inflammation of the guttural pouch
rhinitis
inflammation of the nasal mucosa
sinusitis
inflammation of the sinuses
catarrhal (mucoid) exudate
-thick but clear
chronic irritation, moderate injury -> goblet cell hyperplasia and submucosal glandular hyper secretion
fibrinous exudate
-tan, stringy fibrillary material on mucosa
severe tissue injury causing fibrinogen to leak from nasal vessels
purulent/suppurative exudate
-thick, yellow, opaque
infection with pyogenic organisms (bacteria) -> accumulation of neutrophils
granulomotous exudate
-nodular, more space occupying
chronic inflammation with pathogens that are resistant to phagocytosis -> accumulation of macrophages/lymphocytes/plasma cells and fibrous connective tissue
most common viral cause of canine rhinitis/canine resp disease complex
canine distemper virus
what are the two most common bacterial causes that occur secondary to the viral rhinitis of canine resp disease complex
bordetella bronchiseptica
pasturella multocida
most common fungal cause of canine rhinitis/ canine resp disease complex
aspergillus spp
multifactorial disease of canine infectious tracheobronchitis (kennel cough)
-crowding/mixing
-poor ventilation and stress
-predisposes infection to bordetella bronchiseptica and other viruses
what does canine infectious tracheobronchitis result in
suppurative mucopurulent rhinitis, tonsillitis -> tracheitis with goose honk cough -> can progress to bronchopneumonia
most common fungal disease in dogs
aspergillus fumigatus
what specific breed and type of dogs are affected most by the fungus aspergillus fumigatus
German Shepards and dolichocephalic breeds (long nose breeds), fungus gets trapped and can’t get out
viral causes of feline rhinitis and conjunctivitis/ feline resp disease complex
-feline calicivirus
-feline infectious rhinotracheitis (feline herpesvirus 1, FHV-1)
what are the secondary bacterial causes of feline rhinitis and conjunctivitis/ feline resp disease complex
mycoplasma felis
chlamoydophila felis
fungal cause of feline resp disease complex
cryptococcus spp
what is the most common sign of feline calicivirus
oral ulcerations
what is the most common sign of FHV-1 (feline herpes virus)
corneal ulcerations
dendritic ulcerations
(pathognomonic)
how would you describe cryptococcus neoformans/ C. gatti in cats
-gelatinous polypoid mass
-masses consist of yeast with few macrophages
-granulomatous rhinitis
-roman nose
what is the cause of infectious bovine rhinotracheitis (IBR- bovine herpesvirus 1)
mannheimia haemolytica synergism
-bacterial infection that will occur together and worsten together)
in bovine herpes virus 1 (infectious bovine rhinotracheitis) what will form on the trachea to cause tracheitis
fibrinonecrotic (diphtheritic) membrane which is a layer composed of fibrin, necrosis, neutrophils lining the trachea
causes of atrophic rhinitis in pigs
co-infection with bordatella bronchispetica and toxigenic agents of pasturella multocida
(bacterial)
pathogenesis of atrophic rhinitis in pigs
co-infection -> inhibits osteoblast and increase osteoclast activity -> osteopenia, atrophy, loss of nasal conchae -> septal deviation
cause of parasitic rhinitis in sheep
oestrus ovis
-myiasis infection with fly larvae in living tissues, deposits larvae in nostrils
cause of parasitic rhinitis in cats
cuterebra spp
-larvae migrate in the nasal cavity and within the trachea
what is sequela to upper respiratory disease, dehorning complication, and periodontitis/ periodontal abscess
sinusitis
common equine viral infections
-equine influenza (highly contagious)
-equine viral rhinopneumonitis (herpes viruses 1 and 4)
how does equine viral rhinopneumonitis present based on ages
-foals (4-8 months): mild respiratory disease
-mares: myeloencephalopathy and abortions
pathogenesis of equine herpes virus 1 and 4
herpes virus can remain latent in trigemical ganglia -> reactivated during time of stress and immunosuppression and shed -> aerogenous transmission to susceptible hosts
what important things run through the guttural pouch
-internal carotid, external carotid, maxillary artery
-CN VII,IX, X, XI, XII
-atlanto-occiptical joint