Anesthesia and surgery – being properly prepared

Just like us humans, our pets may also require surgical or diagnostic procedures that cannot be performed on an awake animal. Most operations and some diagnostic procedures, such as endoscopies or dental treatment, require anesthesia (a medically induced state of sleep), which carries certain risks even in healthy animals and during routine procedures. We will explain what you need to bear in mind before and after such a procedure in order to minimize these risks and what complications can arise during anesthesia.

INHALT
What you need to consider before the operation Anesthesia methods Risks of anesthesia After the operation
What you need to consider before the operation

If general anesthesia is administered, the animal must be fasting beforehand. A full stomach puts strain on the circulatory system and the anesthetic can cause vomiting, which can lead to suffocation or aspiration pneumonia (pneumonia caused by inhaling vomit). Animals should therefore not be fed for at least twelve hours before an operation. Water must always be available to the animals.

In the days before and on the day of the operation, the animal should not exert itself unnecessarily so as not to overload the cardiovascular, nervous, and immune systems. However, moderate exercise is important so that the bladder and bowels can be emptied before anesthesia.

Routine operations should only be performed on healthy animals. Immediately before the operation, the animal is examined again by the veterinarian and blood is taken to ensure that there are no health restrictions that would increase the risk of anesthesia and surgery.

Anesthesia methods

Different anesthetics and methods are used depending on the planned procedure.

Sedation (= immobilization)

For minor procedures or manipulations that cannot be performed on an awake animal, sedation is often used. The animal is sedated with medication and its pain perception is reduced, but it remains partially conscious.

Local anesthesia

Local anesthesia describes the local elimination of pain in the area of nerve endings without impairing consciousness. It is used, for example, on the skin to perform minor surgical procedures. In combination with sedation, skin wounds can be sutured without the animal feeling any pain.

Regional anesthesia (= partial anesthesia)

Regional anesthesia includes various anesthesia procedures that all aim to eliminate pain and numb certain areas of the body. This involves the targeted blocking of specific nerves or nerve plexuses with an anesthetic to numb the area supplied by these nerves. The patient remains conscious during regional anesthesia. An example of regional anesthesia is epidural anesthesia, in which the anesthetic is injected into the space around the spinal cord to numb the nerves that transmit pain.

General anesthesia (= full anesthesia)

Under general anesthesia, the animal's consciousness and pain perception are completely shut down and the muscles relax. The anesthetics used act on the central nervous system and the animal cannot be awakened. A distinction is made between injection anesthesia, in which anesthetics are administered via the blood, and inhalation anesthesia, in which the anesthetic is inhaled by the patient in gas form via a tube inserted into the windpipe (ventilation tube).

Dog under general anesthesia
Extensive surgical procedures are performed under general anesthesia
Risks of anesthesia

Even though anesthetics and anesthetic techniques in veterinary medicine have improved considerably in recent years, thereby reducing the risks, every anesthetic and every operation still carries a certain risk, and it is important for owners to be aware of this.

In general, healthy animals undergoing routine surgery have a lower risk of anesthesia complications than animals that need surgery for conditions such as uterine infection (in dogs) or acute colic (in horses). The cardiovascular and immune systems of these animals are already compromised, and anesthesia places an additional strain on them. With the help of modern and efficient equipment for monitoring bodily functions during anesthesia, anesthesia-related incidents cannot be ruled out, but they can be detected and treated at an early stage.

What can happen?

  • Nausea and vomiting
  • Aspiration pneumonia: pneumonia caused by inhaling vomit
  • Injuries to the jaw, throat, larynx, or trachea caused by the tube
  • Respiratory problems
  • Cardiovascular disorders
  • Allergic reactions
  • Seizures
  • Disorders of the body's heat regulation
  • Bleeding and injury to nerves, vessels, or tissue

There are additional specific risks for different animal species. In horses, for example, muscle and nerve damage can occur due to their high weight and the resulting compression when lying down. During the recovery phase, there is also a high risk of injury due to sudden attempts to stand up. Almost all equine clinics therefore have padded recovery boxes for horses.

After the operation

Thanks to modern, gentle anesthetics, the anesthesia can be kept as deep as necessary, which also significantly shortens the post-anesthesia and recovery phases. Even if your pet slowly regains consciousness after the operation, its temperature regulation is still impaired by the anesthesia, which is why it must be kept warm. Perception and coordination also return slowly. The newly operated animal should be given enough time to sleep in a warm and quiet place where there is no risk of injury.

To allow the entire organism to recover from the stress of anesthesia and surgery, the operated animal should be rested after the operation. Exactly what this rest should look like and how long it should last depends on the type of surgery, the species of animal, the condition of the animal, and several other factors, and should therefore always be discussed with the attending veterinarian on a case-by-case basis.

Since complications such as wound healing disorders, bleeding, or pain can still occur even after a successful operation, it is particularly important that you follow your veterinarian's instructions so as not to jeopardize the long-term success of the operation.