Issue Description Veterinary anesthesia is anesthesia performed on animals (excluding humans) performed by a veterinarian. Anesthesia is used for a
wider range of circumstances in animals than in people, due to animals' unwillingness to cooperate with certain diagnostic or therapeutic procedures. Veterinary
anesthesia includes anesthesia of the major species: dogs, cats, horses, cattle, sheep, goats, and pigs, as well as all other animals requiring veterinary
care such as birds, pocket pets, and wildlife.
The most important safeguard comes prior to the administering of the anesthetic. Your vet can perform a
blood panel to determine the likelihood of potential problems. Since anesthetics are eliminated from the blood stream, through both the liver and kidneys, these
functions should be checked. Your vet should also be made aware of any existing or previous health problems, such as respiratory problems or heart murmurs. This
allows your vet to be prepared should problems develop during anesthesia and surgery. Other Names Anaesthesia, Sensitivity To Anaesthesia
Specialization In Anesthesia In North America, the American College of Veterinary Anesthesiologists is one of 20 specialty organizations recognized by the American Veterinary Medical
Association. The ACVA was recognized by the AVMA in 1975, despite attempts by the AVMA to include anesthesia as a subspecialty of surgery or medicine. As of 2007,
there are 156 Diplomates of the ACVA. To become an ACVA board-certified Diplomate, veterinarians must be involved in at least one year of clinical practice
followed by three years of residency in anesthesia supervised by ACVA Diplomates, have accepted for publication a scientific peer-reviewed research article, and
pass both a written and oral examination.
In Europe, the European College of Veterinary Anaesthesia and Analgesia is one of 21 specialty organizations
recognized by the European Board of Veterinary Specialisation.
Anesthesia Technicians Evidence exists that suggests that anesthesia which is supervised by a qualified technician is safer than anesthesia without a technician. In most private
veterinary practices, the technician administers and monitors anesthesia with supervision from the attending veterinarian. In many academic institutions, anesthesia technicians are involved in working with and teaching veterinary students as well as supervising anesthetized cases. The Academy of Veterinary
Technician Anesthetists is a provisional specialty academy of the North American Veterinary Technician Association and is responsible for licensing technicians
as being specialized in anesthesia. For a technician to become specialized, they must be a licensed technician in their state, accumulate 6000 hours of work in
veterinary medicine (at least 75% of which must be in anesthesia), 40 hours of continuing education related to anesthesia, demonstrate proficiency in anesthesia
skills, and pass a comprehensive written examination.
Application In Animals Anesthesia is required for many surgical procedures which require the patient to be immobile, unaware, and without pain. In addition, certain diagnostic
procedures require anesthesia, notably stomach or airway endoscopy, bone marrow sampling, and occasionally ultrasound. Aggressive animals may require anesthesia
in order to handle and perform a physical exam or obtain blood for testing. Exotic animals frequently require anesthesia for simple procedures (such as taking a
radiograph or catheter placement) due to lack of domesticity. Animals may require anesthesia for therapeutic procedures, such as urinary catheterization to
relieve obstruction, injection into a mass, or removing fluid from the eye to treat glaucoma.
In addition to anesthesia, analgesia is often managed by
anesthesiologists or is included in the considerations for anesthesia.
Techniques In Small Animals Cats and dogs are frequently anesthetized for surgical procedures. Small animals are most often placed under general anesthesia due to the types of procedures
typically performed, the small size of the patient, their suitability to general anesthesia, and the greater degree of control. A balanced anesthesia protocol can
be used whereby different drugs with different effects are used so that a high dose of just one drug can be avoided. For example, combining a sedative and an
opioid will permit less inhalant anesthesia to be used, improving cardiovascular stability. A one year study in a teaching hospital shows that dogs and cats
typically experience a 1 in 9 chance of anesthetic complications, with a 1 in 233 risk of death. A larger scale study states the risk of death in healthy dogs
and cats as 1 in 1849 and 1 in 895 respectively. For sick dogs and cats, it was 1 in 75 and 1 in 71 respectively. For rabbits, the risk were 1 in 137 and 1 in 14
respectively for the healthy and sick groups.
Techniques In Horses And Ruminants Many procedures can be performed in the standing horse with heavy sedation alone. Some procedures may require general anesthesia due to the location of surgery
(for example, castration). Other procedures in horses require general anesthesia using an inhalant anesthetic. Horses, due to their complex physiology as
performance animals, suffer a number of difficulties that can complicate anesthesia. This results in horses having a higher risk of perioperative fatality -
approximately 1 in 100.
Most procedures in ruminants can be performed standing under sedation and/or local anesthesia. This strategy is manageable due
to the types of procedures being performed, the larger size of the patient, the relative difficulty of general anesthesia, and the cost of the procedure versus
the product value of the animal.
Anesthetic Agents Most anesthetic agents used in human medicine are used in veterinary medicine. Alpha-2 receptor agonist drugs such as xylazine, romifidine, detomidine, and
medetomidine, are used frequently in veterinary species (particularly large animal), but are rarely used in people. Guaifenesin is used as a muscle relaxant
prior to anesthesia induction in some animals. Propofol is rarely used in large animals due to the cost. Butorphanol is rarely used in people but is commonly used
in all species. Ketamine, used in children for anesthesia, is used extensively in many species to induce anesthesia or cause heavy sedation. Expensive agents,
such as etomidate and desflurane are rarely used outside of university hospitals. Different species have different responses to drugs. For example, horses may
experience mania with morphine whereas dogs typically become sedated. Rabbits and guinea pigs are well sedated with midazolam, which can occasionally excite dogs