Anesthesia 26
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37 Terms
What makes anesthesia higher risk in horses
large size physiology and higher anesthetic mortality rate
What is a key respiratory feature of horses
obligate nasal breathers
Why are horses prone to hypoxemia under anesthesia
ventilation perfusion mismatch
What causes VQ mismatch in horses under anesthesia
inhalant anesthetics alter pulmonary blood flow
What position increases risk of atelectasis in horses
dorsal recumbency
What is compression atelectasis
collapse of lung tissue due to body weight in recumbency
Why do anesthetic drugs worsen breathing in horses
they depress respiratory drive and muscle function
What airway complication can occur after prolonged anesthesia in horses
upper airway obstruction from nasal edema
Why is IV access required before equine anesthesia
for drug administration and emergency access
Why should food be removed from the mouth before anesthesia
to prevent aspiration of debris
Why should shoes be removed or taped before anesthesia
to prevent injury during recovery
When should perioperative drugs be given before equine anesthesia
about 30 minutes before induction
What types of drugs are given preoperatively in horses
antibiotics anti inflammatories and tetanus prophylaxis
Why is resuscitation important before anesthesia in compromised horses
to correct dehydration or shock
What are major risk factors that increase anesthetic complications in horses
emergency surgery long duration poor condition trauma dehydration
What type of surgeries increase anesthetic risk in horses
colic surgery and fracture repair
What patient populations are higher risk for anesthesia in horses
very young and geriatric horses
What time of day is associated with higher anesthetic risk in horses
midnight to early morning
What is the ASA physical status system
classification of patient health before anesthesia
What is the CHARIOT system
tool to assess anesthetic risk in horses beyond ASA status
Why are horses prone to myopathy and neuropathy
large muscle mass and pressure during recumbency
What cardiovascular characteristic is normal in horses under anesthesia
slow heart rate
What type of arrhythmia is common in horses
AV block
What ECG finding is normal in horses
wandering pacemaker
Why is a biphasic P wave normal in horses
large atrial mass
Why is fasting controversial in horses
can cause stress so food is only withheld briefly
How long are horses typically fasted before anesthesia
3 to 6 hours
What is a key step before induction in horses
ensure adequate staff and safe handling
Why is behavior important in equine anesthesia
horses are unpredictable and can injure staff
What is a major cause of anesthetic death in horses
complications during recovery
Why is recovery the most dangerous phase in horses
risk of injury while standing
What should be ensured during recovery in horses
safe controlled environment and monitoring
What happens to pulmonary blood flow with inhalant anesthetics
loss of hypoxic pulmonary vasoconstriction
Why does loss of hypoxic pulmonary vasoconstriction matter
worsens hypoxemia
What is hypoxemia
low oxygen levels in the blood
Why do horses develop hypoxemia under anesthesia
poor ventilation and altered blood flow in lungs
What is the main goal of equine anesthesia management
maintain oxygenation perfusion and safe recovery