Get the facts about the real risks, and learn what you can do to ensure your pet has a positive experience
Dogs and cats may require anesthesia for various reasons throughout their lives. Many pets undergo planned surgical procedures, such as spaying or neutering at a young age. Pets also need anesthesia when they’re getting dental cleanings, which are essential for preventing health problems throughout their bodies. Some pets may require emergency surgery to repair broken bones or to remove something from their stomachs that they shouldn’t have eaten.
People often are apprehensive about their pets undergoing anesthesia. This fear may even cause them to skip procedures that they don’t think are essential for their pets. Unfortunately, this means cats and dogs might not get all the care they need. To help assuage your fears, this article explains the safety of anesthesia and highlights how you and your veterinarian can work together to ensure the best outcome for your pet.
What Is the Risk My Pet Won’t Wake Up?
Veterinarians take numerous precautions before deciding to anesthetize a pet, and technological and pharmaceutical advancements have made veterinary anesthesia safer than ever before. Even still, anesthesia comes with some risk, as does any medical treatment. Veterinary scholars wanted to quantify this risk for pets as best they could. So, in a recent study called the Confidential Enquiry into Perioperative Small Animal Fatalities (CEPSAF), researchers collected data from 98,000 dogs and almost 80,000 cats over two years to generate the most comprehensive information available today. The researchers recorded health outcomes from the time the cats and dogs were sedated until 48 hours after the end of any procedure that required anesthesia.
Results showed that 0.17% of dogs and 0.24% of cats will pass away due to complications from anesthesia. If pets are sick when they undergo anesthesia, the risk increases to about 1.4%.
To help minimize the risk your pet will experience anesthesia-related problems, your veterinarian will perform a thorough examination.
Further analysis of the CEPSAF study revealed that most problems occur after anesthesia, with the most critical time being the first three hours after the end of anesthesia. For this reason, your veterinary team will monitor your pet carefully during recovery and will keep your pet at the clinic until it is fully awake.
To help minimize the risk that your pet will experience anesthesia-related problems, your veterinarian will perform a thorough physical examination, run some blood tests, and ask you several questions before administering anesthesia. This preanesthetic evaluation assists the veterinarian in assigning your pet an anesthetic status, usually on a scale of I to IV, which is similar to what’s done for people. This status helps the veterinarian determine your pet’s risk for anesthesia-related complications. A blood test helps determine if there are problems in your pet’s liver and kidneys, which are important for metabolizing and excreting anesthetic drugs. A blood test also helps the veterinarian choose the right anesthetic drugs for your cat or dog. If your veterinarian is concerned about your pet’s heart or lungs, more tests may be needed, such as an electrocardiogram, an echocardiogram, or thoracic radiography. If any of the test results worry your veterinarian, he or she will talk with you about whether it’s safe for your pet to undergo anesthesia.
Preanesthetic testing and evaluation are particularly important for the following groups of pets, which are more likely to have health conditions that need to be addressed before, during, and after a procedure that requires anesthesia. Even still, it’s often best for these pets to be anesthetized in order to get the treatment they need. Your veterinarian will evaluate your pet to help you make the right decision.
- Senior pets. Dogs and cats older than 12 face a higher risk of anesthesia-related complications because they are more likely to already suffer from an organ problem or disease that might make it more difficult for them to tolerate anesthesia. Preanesthetic evaluation will tell your veterinarian which health issues need to be addressed to avoid anesthesia-related complications during the procedure.
- Small pets. Veterinary teams deal carefully with dogs weighing less than 11 pounds and cats weighing less than 4 pounds. Your veterinarian needs an exact weight for these smaller pets in order to prevent an overdose of the anesthesia drugs. Small pets also are more likely to get cold during anesthesia, which can cause problems. Therefore, veterinary team members carefully monitor pets’ temperatures and use equipment such as warming blankets to prevent hypothermia.
- Obese pets. The hearts and lungs of obese cats and dogs must work harder in general, and anesthesia challenges these organs even more. Again, your veterinarian will carefully evaluate obese pets to ensure they’re healthy enough to undergo anesthesia.
Preparing Pets for Anesthesia
In addition to examining and testing your pet before anesthesia, your veterinary team will ask about your pets’ general health and any medications they’re taking. It is important to tell your veterinarian if you are giving your cat or dog any nonprescription drugs such as aspirin—which can cause excessive bleeding during surgery—or any herbs or supplements, including fish oils or other joint products. People often assume that since herbs and supplements are natural they cannot cause any problems, but veterinarians are learning that this isn’t true. St. John’s wort, kava kava, and ginkgo biloba can increase bleeding in pets and may interact with anesthetic drugs, resulting in overly heavy sedation and problems with blood pressure.
Many veterinarians will ask that you drop your pet off on the day of surgery in order to avoid unnecessary stress from staying overnight at the veterinary clinic. If you’re dropping your pet off on the same day—usually in the morning—you will be asked not to feed your dog or cat after its last meal the day before. This helps ensure your pet does not vomit any food that could get into the lungs before, during, or after anesthesia. If your pet did accidentally have access to food, don’t be embarrassed. These things happen. Just be sure to tell your veterinarian this important information. Your veterinarian may need to take extra precautions or change the schedule so that your pet has its procedure later in the day, after the food has had time to be digested.
Monitoring for Safety
Another critical aspect of successful anesthesia is tracking patients’ vital signs. When veterinarians and technicians monitor anesthetized pets with a pulse oximeter, an instrument that measures the blood’s oxygen saturation, patient outcomes significantly improve because the instrument alerts the veterinary team to problems before they become serious. The pulse oximeter is just one type of monitoring equipment that has been developed to improve anesthesia safety. Your veterinary team uses various devices to promptly adjust anesthetic doses and treat pets throughout a procedure. What’s more, the creation of new and better anesthetic drugs has also increased safety.
These strides in veterinary anesthesia have been driven, in part, by the fact that veterinarians have begun to specialize in certain areas, one of which is anesthesia. Similar to specialists in human medicine, these veterinarians undergo extensive training. Veterinary anesthesia specialists have completed in-depth study in anesthesia and pain management, including a three-year residency program and a certification examination. These specialists are referred to as diplomates of the American College of Veterinary Anesthesiologists. They work in university referral hospitals, as well as private practices like the one your pets visit.
Veterinary technicians also can specialize in anesthesia by becoming members of the Academy of Veterinary Technician Anesthetists. In order to become a member, credentialed veterinary technicians must amass at least 4,500 hours of anesthesia experience and complete extensive professional education. Again, veterinary technician specialists may work in university settings or in general veterinary practices.
Knowing that your pet needs anesthesia can be worrying. To ensure the best outcome, keep your pet at a healthy weight, keep a list of drugs and supplements your pet is receiving, and follow your veterinarian’s instructions for preparing for the procedure. And don’t hesitate to ask questions about the specific risks to your pet, available monitoring equipment, and the qualifications of the staff who will be looking after your pet during its hospital stay. By working with your veterinary team, you’ll help ensure your pet awakes from anesthesia healthier than before.