Cardiorespiratory Flashcards
state the function of the heart
pump blood around the body
list the phases of heart contraction
systole
diastole
what is sytsole?
relaxed phase
filling of the heart
what is diastole?
contracted phase
pumping out blood
state normal dog HR
60-180bpm
state normal cat HR
120-240bpm
what are congenital heart diseases?
abnormalities of heart development
list some congenital heart diseases
aortic stenosis
patent ductus arteriosus
pulmonic stenosis
ventricular septal defect
list some acquired heart diseases in dogs
myxomatous mitral valve disease
dilated cardiomyopathy
pericardial effusion
state an acquired heart diseases in cats
hypertrophic cardiomyopathy
define arrhythmia
heart rhythm abnormality
how can history help diagnose cardiac disease?
incidental findings of murmurs or arrhythmia exercise intolerance syncope weakness heart failure sudden death
define syncope
fainting
what are signs of left sided heart failure?
tachypnoea
dyspnoea
what are signs of right sided heart failure?
difficulty breathing
distended abdomen
what is assessed in physical exam for cardiac assessment?
body condition MM CRT jugular veins- if visible or pulsing peripheral pulses RR HR murmur grade lung sounds
what is RR in CHF?
35-40brpm
what is seen in grade 1 heart murmur?
quiet
needs time to localise
what is seen in grade 2 heart murmur?
quieter than heart sounds
what is seen in grade 3 heart murmur?
as loud as heart sounds
what is seen in grade 4 heart murmur?
louder than heart sounds
what is seen in grade 5 heart murmur?
very loud with precordial thrill
feel with hand
what is seen in grade 6 heart murmur?
very loud
audible thrill without stethescope
list typical findings in heart failure
weak peripheral pulses tachycardia pale MM long CRT weakness murmur exercise intolerance arrhythmia right or left sided congestion
define congestion
blood not pumped forward fast enough
what the difference between left and right sided congestion?
left- lungs
right- systemic
what are signs of left sided congestion?
pulmonary oedema
tachypnoea
dyspnoea
cough
what are signs of right sided congestion?
distended peripheral veins
ascites
pleural effusion
define ascites
fluid in abdomen
define cardiac cachexia
loss of lean muscle mass
what blood tests can help diagnose cardiac disease?
haematology for systemic disease or anaemia
biochemistry for kidney values and electrolytes
cardiac biomarkers for cardiac cell damage and myocardial stretch
what is the consequence of hypertension in heart disease?
increased cardiac workload which can progress the disease
what is significant about hypotension in heart failure?
suggests decompensation
what is the purpose of ECG in diagnosing cardiac disease?
characterise auscultatory findings
indicate treatment and prognosis
monitor progression or response to treatment
what is the purpose of 24 hour ECG for diagnosing heart disease?
investigate intermittent arrhythmia
determine cause of syncope etc
monitor response to antiarrhythmic therapy
when are thoracic radiographs indicated for diagnosing cardiac disease?
cough
tachypnoea
dyspnoea
what views are taken for imaging of heart disease diagnosis?
right lateral
dorsoventral
what is seen on imaging of congestive heart failure?
pulmonary oedema
distended pulmonary veins
what can be seen on radiographs with lung pathology present?
pneumonia
neoplasia
what is seen on imaging with cardiomegaly?
vertebral heart size in dogs over 10.7 and cats over 8
elevated trachea
increased sternal contact
what is meant by stenosis?
narrowing
what are the types of stenosis?
subvalvular
valvular
supravalvular
how is stenosis diagnosed?
ECG
what type of stenosis is aortic and what are the consequences?
subvalvular
left ventricular hypertrophy, left sided congestive heart failure
what type of stenosis is pulmonic and what are the consequences?
valvular
right ventricular hypertrophy, left sided congestive heart failure
state clinical signs of stenosis
asymptomatic arrhythmia exercise intolerance syncope congestive heart failure
how is stenosis treated?
beta blockers
balloon valvuloplasty for pulmonic
treat congestive heart failure
describe what is meant by patent ductus arteriosus
failure of ductus arteriosus to close when first breaths are taken so blood flows from aorta to pulmonary artery
what should the ductus arteriosus become after birth?
ligamentum arteriosum
list signs of patent ductus arteriosus?
loud continuous murmur in left heart base
exercise intolerance
pale MM
how is patent ductus arteriosus usually diagnosed?
incidental finding
ECG
ultrasound
what is prognosis for patent ductus arteriosus?
good if successful closure
can cause congestive heart failure if untreated
how is patent ductus arteriosus treated?
interventional closure
surgical ligation
treatment of congestive heart failure
limit stress and exercise
where are ventricular septal defects usually found?
upper septum below aortic valve
what are signs of ventricular septal defects?
right sided systolic murmur
small defects loud and large defects small
how is ventricular septal defects diagnosed?
ECG
what is treatment for ventricular septal defects?
none needed usually
heart failure treatment as needed
what is prognosis for ventricular septal defects?
normal life if small defect
what is signalment for myxomatous mitral valve disease?
hereditary
idiopathic
small breed dogs
adults
which valves are affected by myxomatous mitral valve disease?
mitral
tricuspid
how is myxomatous mitral valve disease diagnosed?
ECG
look at signalment
describe myxomatous mitral valve disease
valves thicken so blood regurgitates
left ventricle and atrium dilate
valves prolapse
what is the sign of myxomatous mitral valve disease?
left sided apical systolic heart murmur
how does myxomatous mitral valve disease progress?
slowly with long asymptomatic period
can progress to left sided congestive heart failure
how is myxomatous mitral valve disease treated?
medication when non-symptomatic
check for progression
treat CHF
diet providing enough calories for prevention of cardiac cachexia
what is signalment for DCM?
idiopathic
hereditary
large breed dogs
adults
what are signs of DCM?
left apical systolic murmur left ventricular dilation decreased systolic function arrhythmia lethargy coughing anorexia tachycardia
how is DCM diagnosed?
ECG
BP monitoring
thoracic radiographs
how is DCM treated?
pimobendane to increase contractility and vasodilation
low sodium diet
taurine supplements
what is prognosis for DCM?
long asymptomatic period
rapid progression to arrhythmia
congestive heart failure
sudden death
state causes of pericardial effusion
idiopathic
neoplasia
large breed adult dogs
what is the consequence of pericardial effusions?
fluid causes tamponade
decreased CO
right sided heart failure
why does pericardial effusion cause right not left sided heart failure?
right is lower pressure than left
what are signs of pericardial effusion?
right sided heart failure
lethargy
vomiting
exercise intolerance
how is pericardial effusion diagnosed?
ECG
how is pericardial effusion treated?
pericardiocentesis
how is pericardiocentesis carried out?
sedation left lateral recumbency visualise with ECG use large catheter measure amount drained and submit for cytology and culture
what us prognosis for pericardial effusions?
idiopathic responds well to treatment
poor if neoplasia
what are causes of hypertrophic cardiomyopathy?
genetics
adult onset
what is the consequence of hypertrophic cardiomyopathy?
impaired filling as increased myocardial thickness
what are symptoms of hypertrophic cardiomyopathy?
anorexia lethargy weak pulses difficulty breathing crackles on breathing exercise intolerance aortic thromboembolism
how is hypertrophic cardiomyopathy diagnosed?
ECG
incidental findings of heart murmur, gallop
what are signs of aortic thromboembolism?
sudden lameness
cold leg
peripheral cyanosis
pain
what is prognosis of hypertrophic cardiomyopathy?
depends on severity
how is hypertrophic cardiomyopathy treated?
medication to manage rhythm and thickening of heart wall
what are causes of heart failure?
disease progression
decompensation of stable heart failure
compromised cardiac filling
what are the consequences of heart failure?
reduced CO tachycardia slow CRT hypothermia bradycardia easy decompensation
how is heart failure treated?
furosemide spironolactone limit stress oxygen pimobendan to increase contractility water to prevent AKI
what is ideal RR and BP for patients with heart failure?
RR- less than 40brpm
BP- over 100mmHg systolic
what are signs of improvement for patients with heart failure?
decreased RR and HR
improved pulses and CRT
how are arrhythmias assessed?
ECG HR sinus complexes regularity timings
what heart conditions can cause bradycardia?
atrial standstill
AV blocks
sick sinus syndrome
what diseases can cause tachycardia?
supraventricular atrial fibrillation
ventricular arrhythmia
ventricular premature complexes
ventricular tachycardia
define fibrillation
lack of contraction
what are signs of atrial fibrillation?
HR 210
irregular rhythm
no P waves
list components of URT
nasal cavity tongue soft palette oral cavity pharynx larynx trachea
list components of LRT
trachea
bronchus
bronchiole
alveoli
what is acute respiratory failure?
lungs cant oxygenate blood or exchange CO2
emergency
what are causes of acute respiratory failure?
airway obstruction ruptured diaphragm pulmonary oedema pneumo, heamo, pyo, chylo thorax neoplasia infection intoxication
list signs of acute respiratory failure
cyanosis dyspnoea tachypnoea orthopnoea tachycardia collapse
what is orthopnoea?
posture to aid breathing
elbows abducted and neck extended
how can oxygen be provided to conscious patients?
flow by
nasal prongs
face mask
oxygen tent
how should oxygen be provided to unconscious patients?
ETT
how is airway maintained in unconscious patients?
ETT
head and neck extended
tracheostomy tube
what are consideration for nursing acute respiratory failure pateints?
oxygen monitoring medications recumbency care exercise feeding barrier nursing if needed
list signs of conditions of URT
nasal discharge sneezing stertor systemic signs CNS signs
what is assessed in URT physical exam?
noise nasal discharge pain facial deformity nasal depigmentation airflow lymph nodes dental disease ophthalmic disease
what are the different causes of nasal diseases?
inflammatory infectious neoplasia trauma foreign body systemic causes other
what are systemic causes of nasal disease?
coagulopathy
hyperviscosity syndrome
systemic hypertension
what are other causes of nasal disease?
dental disease oronasal fistula polyps stenosis BOAS
what are investigations for nasal disease?
bloods test for bleeding disorders serology viral testing GA for full oral exam and nasopharyngeal swab imaging endoscopy biopsy rhinoscopy
what are considerations for rhinoscopy?
need GA
painful
bleeding
what is nursing care for nasal disease patients?
treat dyspnoea remove foreign objects monitor fluids and food remove discharges decongestant therapy isolate if infectious
what are the two types of aspergillosis?
sinonasal
sinoorbital
what type of dogs are predisposed to sinonasal aspergillosis?
meso and dolichocephalics
what predisposes to sinoorbital aspergillosis?
brachycephalics
what are clinical signs of aspergillosis?
mucopurulent nasal discharge epistaxis sneezing pain nasal depigmentation
how is aspergillosis diagnosed?
serology PCR imaging rhinoscopy cytology histopathology fungal culture clinical suspicions
how does imaging help show aspergillosis?
see turbinate destruction
increased soft tissue opacity and density
how is aspergillosis treated?
endoscopic debridement
topical antifungal
what is meant by BOAS?
group of conditions resulting from poor breeding and body conformation of dogs with short noses
what are BOAS abnormalities?
excess soft tissue in skin and airways stenotic nares elongated soft palette hypoplastic trachea enlarged tonsils stertor stridor
how do BOAS patients compensate?
harder insiratory pull causing negative pressure in neck and chest
what are potential consequences of BOAS compensatory mechanisms?
secondary respiratory and digestive problems
laryngeal collapse
hiatal hernia
how does BOAS present?
loud breathing snoring heat and exercise intolerance sleep deprivation gagging vomiting and regurgitation
how is BOAS diagnosed?
physical exam history fluroscopy barium swallow CT of head and neck chest xrays
what is nursing considerations for BOAS patients?
owner education discourage breeding keep low stress avoid excess heat harness not collar ideal body weight managed careful exercise oxygen
how does laryngeal paralysis present?
exercise intolerance soft cough inspiratory stridor can be emergency dysphonia dysphagia cyanosis collapse
what are causes of laryngeal paralysis?
congenital
trauma
nerve infiltration
older large breed dogs
how is laryngeal paralysis diagnosed?
laryngeal exam under sedation or GA
what are nursing considerations of laryngeal paralysis patients?
keep calm nothing around neck keep cool oxygen monitor for aspiration pneumonia, dysphagia, megaoesophagus steroids to reduce laryngeal oedema
what are predispositions for tracheal collapse?
small breeds
obesity
where do tracheal collapses normally occur?
thoracic inlet
how does tracheal collapse present?
goose honking cough
how is tracheal collapse diagnosed?
physical exam
x-ray
fluroscopy
what are nursing considerations for tracheal collapse patients?
sedation corticosteroids bronchodilators restricted exercise harness oxygen intubate if needed weight loss
how is tracheal collapse treated?
surgery to place stent
define hyperpnoea
increased respiratory effort without dyspnoea
define cough
sudden expiratory effort against closed glottis resulting in noisy expulsion of air from lungs
what is the aim of coughing?
protective reflex to clear excess secretions or foreign materials
where are cough receptors found?
large airways nose sinuses pharynx pleura
describe the cough reflex arc
afferent pathway via vagus nerve to cough centre in medulla
efferent pathway via vagus and phrenic nerve to spinal motor nerves to diaphragm, abdominal walls and muscles
what are harmful effects of coughing?
excacerbate airway inflammation and irritation
emphysema
pneumothorax
weakness
what are clinical signs of LRT disease?
cough tachypnoea dyspnoea exercise intolerance weakness cyanosis syncope
define dyspnoea
difficulty breathing
increased respiratory effort
what are URT causes of cough and dyspnoea?
BOAS
laryngeal paralysis
kennel cough
neoplasia
what are LRT causes of cough and dyspnoea?
tracheitis tracheal collapse neoplasia bronchitis asthma foreign body pneumonia lung worm pneumothorax pleural effusion
how are LRT conditions diagnosed?
physical exam
thoracic auscultation
further investigations
what is looked for in physical exam for LRT disease patients?
posture
RR effort and rhythm
URT noise
HR
what may be seen on thoracic auscultation for LRT disease patients?
crackles
wheezing
murmurs
what further investigations may be done for LRT disease patients?
pathology oxygenation assessment laryngeal exam imaging bronchoscopy BALs
what equipment should be prepared for LRT disease patients?
endoscope sterile saline collection pots mouth gag urinary catheter emergency box
what are nursing considerations of LRT disease pateints?
coupage to clear lungs
careful monitoring
observe for complications
access to emergency equipment
what is canine chronic bronchitis?
chronic bronchial inflammation with over secretion of mucus
what are comorbidities to canine chronic bronchitis?
tracheal/bronchial collapse
mitral valve disease
pulmonary hypertension
what predisposes to canine chronic bronchitis?
kennel cough
irritants
allergens
parasites
what are the effects of canine chronic bronchitis?
airways obstructed by mucus
inflammation of airways
bronchomalacia
bronchiectasis
define brochomalacia
weakened cartilage
define bronchiectasis
end stage branchial change
list clinical signs of canine chronic bronchitis
chronic cough dyspnoea tachypnoea gagging pyrexia if pneumonia crackles and wheezing
how is canine chronic bronchitis diagnosed?
imaging
bronchoscopy
BAL
what are nursing considerations for canine chronic bronchitis patients?
weight management harness avoid irritants to airway glucocorticoids bronchodilators antibiotics if needed inhalational therapy
what is prognosis for chronic canine bronchitis?
progressive
years if well managed
can have mitral valve disease or pulmonary hypertension
what diseases are on the spectrum of FLAD?
feline asthma
feline bronchitis
what is FLAD?
chronic bronchial inflammation with mucus hypersecretion causing bronchoconstriction
what is signalment for FLAD?
young to middle aged cats
siamese
what are causes of FLAD?
infections
allergens and hypersensitivity
bronchus obstruction
what are clinical signs of FLAD?
none cough tachypnoea open mouth breathing cyanosis asthmatic crisis
how is FLAD investigated?
chest imaging
bronchoscopy
BAL
how is FLAD treated?
keep stress free oxygen bronchodilators corticosteroids sedation inhalational therapy
how is FLAD managed long term?
dust free litter
no smoking
medication- glucocorticoids and bronchodilators
what is prognosis for acute and chronic FLAD?
chronic- good when treated well
acute- fatal if not quickly managed
what are some pulmonary parasites?
intestinal worms
lungworms
heartworms
what are clinical signs of angiostrongylus infection?
respiratory disease
increased bleeding
neurological signs
how is angiostrongylus diagnosed?
chest imaging
antigen detection
PCR
faecal smear
how is angiostrongylus treated?
moxidection 30 days apart
fenbendazole for 10-20 days
what can be reactions following angiostrongylus treatment?
dyspnoea
ascites
sudden death
what is prognosis for angiostrongylus?
depends on clinical signs
what are associations with bacterial pneumonia?
abscesses
pleural effusions
pneumothorax
what predisposes to bacterial pneumonia?
chronic bronchitis
immunosuppression
foreign body
aspiration
what are clinical signs of bacterial pneumonia?
cough dyspnoea tachypnoea exercise intolerance pyrexia lethargy
how can you diagnose bacterial pneumonia?
neutrophillia
neutropenia
hypoxia
chest imaging
how is bacterial pneumonia treated?
antibiotics oxygen IVFT nebulisation bronchodilators may need lung lobectomy
what is prognosis of bacterial pneumonia?
depends on clinical sign severity
how do pleural space diseases present?
tachypnoea dyspnoea paradoxical breathing muffled lung sounds with effusion absent lung sounds with pneumothorax
describe how pleural effusions happen
gradual collapse of lungs causes negative intrathoracic pressure to become positive
what can be consequences of resolving pleural effusion?
inflammation
pneumothorax
what is the result of not treating pleural space disease?
low CO
cardiac arrest
list signs of respiratory distress
orthopnoea mouth breathing tachypnoea respiratory noises cyanosis restrictive dyspnoea
list the types of dyspnoea
inspiratory
expiratory
mixed pattern
what causes inspiratory dyspnoea?
dynamic upper airway obstruction BOAS polyp foreign body tumour laryngeal paralysis or collapse
what are signs of inspiratory dyspnoea?
stertor
stridor
what causes expiratory dyspnoea?
dynamic lower airway obstruction
tracheal collapse
bronchial collapse
asthma
what are signs of expiratory dyspnoea?
wheezes
what causes mixed pattern dyspnoea?
airway obstruction plueral space disease mass tracheal collapse pneumonia pulmonary oedema
what are signs of mixed pattern dyspnoea?
shallow breathing
reduced lung sounds
laboured breathing
how is respiratory distress diagnosed?
chest radiographs
thoracic ultrasound
thoracocentesis
fluid analysis
define thoracocentesis
aspiration of air or fluid from pleural cavity
describe how thoracocentesis are carried out?
clip and scrub around 8th rib
place butterfly needle in cranial aspect of rib
why is cranial rib space used for thoracocentesis?
caudal side has nerves and vessels
what are complications from thoracocentesis?
pyothorax
pneumothorax
how can you treat respiratory distress?
thoracocentesis
antibiotics
surgery
define pneumothorax
air accumulation in pleural space
what causes pneumothorax?
trauma blebs bullae chronic airway disease iatrogenic
define bleb
small collection of air between lung and visceral pleura
define bullae
lesion on lung that can spontaneously rupture
what is seen on physical exam of patients with pneumothorax?
no dorsal lung sounds
hyper resonant percussion
how is pneumothorax diagnosed?
radiography
ultrasound
how is pneumothorax treated?
rest
thoracocentesis
oxygen
exploratory thoracotomy
list nursing considerations for initial treatment of pneumothorax
delay diagnosing until stable keep calm or sedate oxygen monitor oxygen saturation prepare for thoracoentesis
what is general care for patients with pneumothorax?
care for drains oxygen monitoring analgesia IVFT treat shock recumbency care
what are the main issues of BOAS patients?
resistance to airflow in nose
laryngeal collapse
obstructed or narrowed trachea
how are BOAS patients assessed?
TPR MM SPO2 clinical signs of BOAS ASA grading
what are the aims of surgical treatment of BOAS?
increase airway to reduce resistance to airflow
what surgical procedures can treat BOAS?
soft palette resection
tonsil resection
removal of everted laryngeal saccules
nostril resection
what is pre-surgical prep for BOAS surgery?
ASA grading full clinical assessment client discussion full biochemistry and haematology for further risks pre oxygenate before induction IV after pre-med to minimise stress ocular lube intense monitoring thoracic radiographs
what equipment should be prepared for BOAS surgery?
laryngoscope
urinary catheter and rescue ETT to aid intubation
ETT
suction
describe typical positioning of BOAS surgery
sternal with ties to keep mouth open
table tilted in case of regurgitation
how is BOAS surgery patients monitored through surgery?
SPO2 over 98% capnography for ETCO2 over 35-45mmHg IPPV or mechanical ventilation as needed IVFT if MAP below60mmHg lube throughout
what are complications following BOAS surgery?
airway swelling
vomiting and regurgitation
aspiration pneumonia
describe considerations when extubating BOAS patients?
high risk leave until wont tolerate ETT monitor SPO2 supplement oxygen keep in sternal with head elevated suction available constant monitoring
what is immediate post op care for BOAS surgery pateints?
quiet environment
thermoregulate environment
sedate if stressed
what is general post op care for owners to know for BOAS surgery patients?
harness 6 weeks restricted exercise routine post op checks wet solid food for 6 weeks clear discharge information
what is laryngeal paralysis?
inability for vocal cords to open in response to exercise and respiratory demands
define dysphonia
change or loss of vocal sounds
define dysphagia
difficulty eating
how are mild cases of laryngeal paralysis treated?
anti-inflammatories antibiotics sedatives raised feeding exercise management
how are severe cases of laryngeal paralysis treated?
unilateral arytenoid lateralisation to tie open left arytenoid cartilage permanently
what are post op considerations following unilateral arytenoid lateralisation?
soft meals avoid dust raised food and water wound management change in phonation no swimming as aspiration risk
what is prognosis following unilateral arytenoid lateralisation?
good unless caused by systemic neuromuscular disorder
what is an example of congenital palette defects?
clefts to palettes or lips
what are signs of congenital palette defects?
difficulty feeding
nasal discharge
how are congenital palette defects treated?
surgery to close tissues separating oral and nasal passages
what causes and how are acquired palette defects treated?
trauma
primary or secondary closure
what causes tracheal collpase?
degeneration of tracheal cartilage rings causing DV collapse
state signalment of tracheal collapse
middle aged
small or toy breeds
what are signs of tracheal collapse?
dry harsh loud cough
stridor
build up over time
how is tracheal collapse diagnosed?
radiography
bronchoscopy
fluroscopy
how are tracheal collapses graded during bronchoscopy?
I- 25% loss of lumen
II- 50% loss of lumen
III- 75% loss of lumen
IV- 100% loss of lumen
list non-surgical management of tracheal collapse
weight loss controlled exercise harness avoid smoke corticosteroids if grade 1-2 and young cough suppressants antibiotics steroids bronchodilators
what is the prognosis following surgery for tracheal collapse?
improved airflow
better if less than 6 years old
need management after surgery
what surgery can be done to treat tracheal collapse?
extraluminal ring prosthesis
intraluminal stenting
what are complications of extraluminal ring prosthesis?
laryngeal paralysis
dyspnoea
vascular damage
tracheal ring migration
what can be downsides to intraluminal tracheal stenting?
less long lasting if coughing
can get inflammation around trachea
how are patients prepared for extraluminal ring prosthesis and intraluminal stenting?
pre-oxygenate
careful handling
stress free
ERP- ventral neck prepared, dorsal recumbency
ILS- lateral recumbency, fluoroscopic guidance
what is post op care for tracheal collapse surgery?
calm quiet cool analgesia oxygen soft food monitoring harness
what is lateral thoracotomy?
surgical incision between ribs to view one side of thorax
when is lateral thoracotomy indicated?
lung lobectomy when torsion, neoplasia, abscessation
what is median sternotomy?
surgical incision through sternum to view bilateral thorax
when is median sternotomy indicated?
pyothorax
mediastinal mass
heart surgery
what is a tracheostomy?
emergency procedure to bypass nares, pharynx, larynx and proximal trachea when obstructed
what are indications for tracheostomy?
compromised airway provide airway until obstruction removed laryngeal paralysis BOAS foreign body laryngeal trauma
what is care for tracheostomies?
24/7 monitoring for issues
asepsis
maintain airway
regular prevention of secretion build up
when do tracheostomy tubes need to be checked?
initially every 15 minutes
every 4-6 hours
when are tracheostomy tubes suctioned?
routinely
if blocked
how do you suction tracheostomy tubes?
pre-oxygenate
use premeasured sterile soft catheter no longer than tip of trach tube
once placed turn on suction and move in circular motion withdrawing over 15 seconds
when do tracheostomy tubes need to be changed?
if blocked
why do patients with tracheostomy tubes need humidification?
normal humidification in URT is bypassed
drying can damage mucosa
how can you provide humidification to tracheostomy tube patietns?
humidification filters on tube
nebulisation
how can age affect respiratory disease in horses?
congenital at birth
infections usually in young
asthma if middle aged
exercise induced affects in performance horses
what history can be taken to assess respiratory disease in horses?
environment local infections vaccination history prior illness current illnesses and onset
list features of physical exam for assessing horses respiratory system
demeanour nasal discharge RR and effort heave line due to rectus abdominus hypertrophy chest auscultation rebreathing test
what sampling can be done to assess horses respiration?
nasal and naso-pharyngeal swabs for culture and PCR
tracheal wash
BAL
what imaging can help assess equine respiration?
endoscopy to examine URT sinoscopy head or thoracic x ray head CT ultrasound
how are BAL done?
sedate enter endoscope inflate cuff when in lung instil up to 500ml saline then draw back 50-80% froth shows surfactant and good sample
what is DDSP in horses?
dorsal displacement of soft palette
what are the common presentations of larynx and pharynx disorders in horses?
abnormal respiratory noise on exercise
poor performance
exercise intolerance
how is DDSP diagnosed in horses?
exercising endoscopy
how is equine DDSP treated?
rest
soft palette cautery or laryngeal tie forward to prevent displacement
what causes arytenoid cartilage collapse in horses?
left recurrent laryngeal nerve is long and end dies off
cricoarytenoideus dorsalis muscle which abducts arytenoid cartilage no longer innervated
how is arytenoid cartilage collapse diagnosed in horses?
exercise or resting endoscopy
how is arytenoid cartilage collapse treated in horses?
ventriculocordectomy to remove noise
prosthetic laryngoplasty to hold open cartilage but risk aspiration pneumonia
what is sinusitis in horses?
accumulation of exudate in sinus cavities
what causes primary and secondary sinusitis in horses?
primary- viral or bacterial URT infection
secondary- dental disease
what are signs of sinusitis in horses?
nasal discharge
how is sinusitis diagnosed in horses?
endoscopy to rule out other causes
imaging
sinoscopy
how is sinusitis treated in horses?
sinus lavage
treat underlying cause
what is guttural pouch mycosis in horses?
fungal infection of guttural pouch
what are clinical signs of GP mycosis in horses?
epistaxis
cranial nerve dysfunction
when can GP mycosis in horses be fatal?
if carotid artery wall gets eroded away
how is GP mycosis diagnosed in horses?
GP endoscopy
how is guttural pouch mycosis treated in horses?
surgical occlusion of vessels
topical antifungal
what is strangles in horses?
contagious URT bacterial infection at junction of back of jaw and top of neck
state clinical signs of strangles in horses
dullness
fever
purulent nasal discharge
enlarged abscessing submandibular and retropharyngeal LNs
what complications are caused by strangles in horses?
difficulty breathing
abscesses seeding around body
immune mediated complications
how is strangles in horses treated?
isolation
culture or PCR of abscess
endoscopy and GP lavage
how are horses with strangles treated?
penicillin
drain abscessed lymphnodes
how does equine influenza spread?
inhalational through common air spaces
replicates in RTs
what are symptoms of equine influenza?
coughing pyrexia serous nasal discharge inappetence depression
how is equine influenza diagnosed?
virus detection by ELISA or PCR from swabs
serology
how is equine influenza treated?
rest
NSAIDs
how can equine influenza be prevented?
vaccination but not fully effective as always changing
what are signs of equine herpes virus?
respiratory signs
neurological signs
abortion
how does equine herpes virus spread?
inhalational
how can you prevent equine herpes virus?
vaccination against EHV1 and 4
what causes pleuropneumonia in horses?
horses travelling long distances becoming susceptible to opportunistic infections from pharynx to lungs
what are signs of pleuropneumonia in horses?
fever dullness nasal discharge difficulty breathing weight loss
how is pleuropneumonia diagnosed in horses?
clinical exam
chest imaging
tracheal wash or pleural sample for culture and cytology
how is pleuropneumonia treated in horses?
aggressive penicillin
chest drain
what usually causes asthma in horses?
dust in stables
what is the effect of equine asthma?
increased mucus production
bronchoconstriction
what are signs of equine asthma?
coughing
wheezing
increased respiratory effort
heave line
how is equine asthma diagnosed?
endoscope
TW
BAL
how is equine asthma treated?
environmental management
inhaled steroid and bronchodilator
what is the purpose of diagnostic endoscopies in horses?
examine larynx and pharynx in exercise
list elective surgical procedures of equine URT
ventriculocordectomy/hobday aryepiglottic fold resection prosthetic laryngoplasty/tie back laryngeal advancement/tie forwards soft palette cautery epiglottic entrapment release arytenoid chondritis excision sinus surgery tracheostomy
list emergency surgical prcedures of equine URT
emergency tracheostomy
occlusion of artery for GP mycosis
trauma
thoracic drain placement
what are pre-op consideration for patient undergoing equine URT surgery?
behaviour if standing surgery
pathologies present
whole body clinical exam
2 hours starving
what needs to be planned for equine URT surgery?
equipment positioning GA or standing plan if things go wrong recovery plan airway management post op plan
what are advantages of standing sedation for equine URT surgery?
no GA
cheaper
easier access
less haemorrhage as above heart
what are disadvantages of standing sedation for equine URT surgery?
temperament may not be suitable less control over complications full environmental control needs to be fast may still need GA
what are advantages of GA for equine URT surgery?
more control of horse safer if unpredictable horse good access less time pressure oxygen available
what are disadvantages of GA for equine URT surgery?
more expensive longer need the facilities risk of GA constant airway supervision needed
what needs considering during URT surgery in horses?
patent airway
protect from aspiration
aware of obstruction
what needs considering post equine URT surgery?
swellings compromising airway inhalational pneumonia feed moist hay feed high for tie forward to prevent pressure on sutures feed low for rest for drainage analgesia
what safety is needed for laser surgery?
goggles
signs
NO fire hazard with laser
suction for toxic gases produced
what are lasers and scalpels used for?
lasers- excision
scalpel- repair and reconstruction
what are indications for sinus flap surgery in horses?
sinus emphysema
sinus cysts
ethmoid haematoma
maxillary tooth repulsion
what is post op care for soft palette cautery in horses?
analgesia
monitoring eating
what is post op care for hobdays?
leave larynx open for drainage
laryngostomy tube placed for recovery and overnight
occlude before removal to check can breathe
where are chest drains placed in horses?
fluid- ventral thorax
gas- dorsal thorax
bilateral if needed as little communication between pleural spaces
describe how to prepare for thoracoscopy
standing sedation
suction and oxygen
what is thoracoscopy used for?
investigate and treat pleural and pulmonic disease
when are tracheotomy tubes used?
emergency
when are tracheostomy tubes used?
long term use for surgery or beyond