Equine Emergencies: Recognition & Basic Steps Flashcards
what is the definition of emergency
a serious unexpected and often dangerous situation requiring immediate action
what are the body systems that can include emergencies
- alimentary and liver
- respiratory
- cardiovascular, spleen, blood
- nervous system
- special senses
- urinary system
- musculoskeletal
- integumentary
- reproductive
what are emergencies in the alimentary and liver
colic (1 in 10), abdominal trauma (eventration)
what are urgent incidents in the alimentary and liver (4)
- choke (esophageal obstruction)
- colic (potentially)
- poisons/toxins
- concentrate overload
what are respiratory emergencies (2)
- dyspnea (obstruction)
- thoracic trauma (open thorax)
what are cardiovascular, spleen and blood emergencies (3)
- severe hemorrhage
- wound
- guttoral pouch mycosis
what are nervous system emergencies
- trauma/fracture of cranium or spinal
what are urgencies in the nervous system (3)
- tetanus
- pharyngeal paralysis
- vestibular syndromes
what are special senses emergencies
- corneal laceration
what are special senses urgencies
- closed eye
- uveitis
- corneal ulceration
- eyelid laceration
what are urinary system urgencies (2)
- obstruction to urine outflow
- trauma to penis
what are musculoskeletal emergencies (4)
- fractures
- some tendon and ligament injuries
- wounds (laceration or puncture)
- atypical myopathy
what are musculoskeletal urgencies (5)
- wounds (laceration or penetration)
- synovial contamination
- foot penetration
- myopathy
- laminitis
what are integumentary urgencies (2)
- wounds
- burns
what are reproductive emergencies (2)
- dystocia
- red bag delivery
what are reproductive urgencies (2)
- retained placenta
- foal not sucking
how can you prepare for an emergency
- support: have all the phone numbers (colleagues/team, info/contacts)
- facilities: in house, referral options, transport contacts, disposal options
what equipment should be prepared for an emergency (4)
- restraint
- drugs: sedation, anesthesia, analgesia
- equipment: stomach tubes, funnel, rectal gloves, lube, clippers, flash light, scrub, bandages, suture, surgical kit, splints, IV fluids, catheters, sterile gloves, farrier and dental equipment
- euthanasia: somulose
how do you triage and prioritize emergencies
on the phone
- history & signalment
- guidance while they wait
what guidance could you give an owner while they wait for a vet
- remove all food from a choke/colic
- don’t remove if nail in foot
- bleeding wound apply pressure and don’t remove
- red bag delivery –> talk through won’t make it in time
what questions should you ask to triage at the scene (4)
- is this really an emergency?
- are there humans at risk?
- clinical exam - patent airway? vital parameters TPR, hemorrhage?
- prioritize one animal over another?
what are the ABCD
A: establish an airway
B: breathing for patient
C: circulation (chest compressions, right lateral recumbency –> knees in adults and hands in foals)
D: drugs
what can cause upper airway obstruction (3)
- severe trauma/swelling/edema of head/nasal passages
- pharyngeal obstruction (severe strangles, Streptococcus equi)
- severe laryngeal obstruciton: laryngeal swelling/edema, bilateral laryngeal paralysis (traumatic, hepatic encephalopathy, primary neurological, idiopathic)
how do you treat upper resp obstruction
bypass the upper resp tract –> emergency tracheostomy
how is an emergency tracheostomy performed (4)
- usually upper third trachea: 3rd-5th tracheal ring
- midline verticle incision: divide muscles (sternothyrohyoideus) overlying trachea
- stab incision through annular ligament between two rings: extend either side big enough to allow placement of tracheostomy tube
- secure to neck
what is the circulating blood volume of a horse
7-8% of body weight
500kg = 35-40 litres
what volume of blood can horses lose before they decompensate
~30%
what are the clinical signs of hemorrhage
- increased resp rate
- pale mucous membranes
- high heart rate
- poor perfusion
what are external causes of hemorrhage
- wound
- guttural pouch mycosis
what are internal causes of hemorrhage
abdominal/thoracic: broad ligament hematoma in mares post-parturition
what are the clinical signs of significant blood loss (3)
- tachycardia
- tachypnea & hyperpnea indicative of significant hypovolemia and hypoexmia
- mucous membrane colour depends on severity of loss (pale/white)
what should be included in your clinical exam (6)
- is the animal viable?
- respiratory, CV, musculoskeletal (evidence of poor peripheral perfusion, dehydration, sepsis, endotoxemia), organ systems
- shock, exhaustion, trauma
- injuries that are immediately life threatening (open body cavity)
- what injuries will be exacerbated by moving/rescue/extraction (stabilization)
- history
what are the reasons for sedation
- human safety
- animal safety
when would chemical sedation be used
any procedure: assess risks - how can they be mitigated? (environment or handler? other restraint? PPE?)
before you sedate what should you do first
- clinical exam: focus on CV system due to side effects
- quite environment: avoid excitement, minimize stimulation
- choice of sedation and dose and route
what factors determine what sedation should be used
- age, breed and temperament
- clinical findings
- procedure to be performed (duration, expected pain level)
- previous sedation history
what is the duty of care when administering sedation
to horse, owner, farrier even for sedate to clip
horse is still dangerous
how are alpha-2 adrenoreceptor agonists as sedatives
reliable, dose-dependent
what are alpha-2 adrenoreceptor agonists usually combined with and why
opioid to decrease the likelihood of being kicked but doesn’t eliminate it
ex. butorphanol
do alpha-2 agonists provide analgesia
yes
visceral (for colic) and somatic
do alpha-2 adrenoreceptor agonists cause muscle relaxation
yes
may assist in treatment of choke
what else are alpha-2 adrenoreceptor agonists used for
anesthesia as pre-medication
what are licensed alpha-2 agonists in the UK
how long does xylazine IV last
20-30 mins
how long is the onset of action of xylazine IM
15-20 min
what are the disadvantages of xylazine
not as reliable, shorter duration and more expensive
what is xylazine useful for
assessment of fractious colic on its own
permits exam and allows reassessment of pain at end of this time, allows full assessment before use longer acting analgesia
obtain heart rate before administer
what is the duration of detomidine
45-60 mins IV
what routes can detomidine be used
IV
IM (30 min onset)
oral transmucosal gel
when is detomidine used
routine work
what is detomidine combined with typically
butorphanol
how does detomidine compare with romifidine (4)
- romifidine with butorphanol “plants” feet to ground better
- greater muscle relaxation: greater instability and ataxia
- greater sedation at lower dose range
- greater analgesia
can detomidine be used with colic
use with care, usually on its own
potent analgesic (10x xylazine) with longer duration
reserve for horses with severe, unrelenting pain (can mask escalating pain)
what is the duration of romifidine
60-120 mins IV
when is romifidine used
routine work in combo with butorphanol
can romifidine be used for colic
yes but not particularly useful