Pyometra in cats: causes, symptoms, treatment

Pyometra in Cats: Symptoms and Treatment of Uterine Infection

Pyometra is one of the most serious uterine conditions that can affect unspayed cats. This life-threatening infection involves the accumulation of pus in the uterus and is often difficult to detect in its early stages, especially if the symptoms are not obvious. Whether we are talking about open pyometra, where signs are more easily observable, or closed pyometra, a much more dangerous and insidious form, prompt treatment is essential to prevent major complications.

Below, we will analyze in detail the symptoms, diagnostic methods, and treatment options for pyometra in cats, as well as how you can support your cat's recovery after intervention. We will also discuss the preventive measures owners can adopt to reduce the risk of this dangerous condition.

• What is pyometra in cats?
• Causes of pyometra in cats
• Symptoms of pyometra in cats
• Diagnosis of pyometra
• Treatment of pyometra
• Recovery after treatment
• Prevention of pyometra
• Frequently asked questions

What is pyometra in cats?

Pyometra is a severe uterine infection that affects unspayed cats, especially those of middle or older age. It usually occurs as a result of hormonal changes that occur during the reproductive cycle when progesterone stimulates the glands in the uterus to produce secretions. If bacteria enter the uterus, they can cause an infection, leading to the accumulation of pus.

Pyometra is a medical emergency that requires immediate treatment, as if left untreated, it can cause serious complications such as uterine rupture or sepsis, both of which can be fatal.

Types of pyometra

There are two main types of pyometra: open pyometra and closed pyometra.

Open pyometra

In open pyometra, the cervix (neck of the uterus) is open, allowing accumulated pus to drain from the uterus. This type is easier to recognize, as cat owners may notice purulent vaginal discharge that is yellowish or brownish. These yellow discharges in cats often have an unpleasant odor.

Although open pyometra is less dangerous than the other form, treatment is essential to prevent the cat's condition from worsening and further complications.

Closed pyometra

In closed pyometra, the cervix is completely closed, which prevents pus from draining from the uterus. This is a much more dangerous form, as the pus remains trapped inside, and clinical signs may be more subtle. Cats with closed pyometra may exhibit lethargy, excessive thirst, a swollen and painful abdomen, and loss of appetite.

This type of pyometra can rapidly lead to uterine rupture and severe systemic infections, making surgical intervention an absolute emergency.

Causes of pyometra in cats

Pyometra is a serious condition that arises from the complex interaction between bacteria and hormonal changes in the cat's body, especially during the reproductive cycle. Several causes and risk factors can contribute to the development of pyometra.

Hormonal imbalances

One of the main factors contributing to pyometra is the presence of high levels of progesterone in the uterus, a hormone released after ovulation. This hormone's role is to prepare the uterus for a potential pregnancy, but it can also cause hyperactivity of the glands in the uterine wall, which secrete fluids.

In this context, the uterus becomes vulnerable to infections, as the secretions can create an environment favorable for bacterial growth. Spaying cats through ovariohysterectomy completely eliminates this risk.

Discuss with your veterinarian the appropriate age for spaying cats to receive personalized advice; the official recommendation advocates spaying before 6 months of age and before the first heat cycle.

Spaying is one of the best investments you can make for your cat's health and longevity. Read some practical tips about spaying your cat if you have decided to schedule the procedure with your veterinarian!

Use of hormonal contraceptives

Some cats are treated with hormonal medications to prevent them from going into heat. These medications contain progesterone or synthetic progestins and can lead to changes similar to those that occur during the cat's natural cycle, increasing the risk of pyometra. Long-term use of hormonal contraceptives is associated with a significantly higher risk of developing uterine infection.

If you want to avoid the discomfort associated with estrus, discuss with your doctor what spaying in cats means in the short and long term and make an informed decision!

Bacterial infections

Bacteria, especially Escherichia coli, are the most common causes of pyometra. These bacteria can enter the uterus through the vagina, especially during the heat period, when the cervix is open, allowing access to bacteria from the external environment. If the cat's immune system fails to fight the infection, the bacteria can multiply in the uterus and cause the formation and accumulation of pus.

Risk factors

There are a number of risk factors that increase the likelihood of a cat developing pyometra in her lifetime:

• Advanced age: older cats are more susceptible to pyometra, as their uterus has been exposed to hormonal cycles multiple times.
• Unspayed cats: unspayed cats have a much higher risk of developing pyometra, as these hormonal changes are repeated with each heat cycle.

In conclusion, pyometra is caused by a combination of hormonal and bacterial factors, and unspayed cats, especially those treated with hormonal contraceptives, are the most vulnerable.

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Symptoms of pyometra in cats

Symptoms of pyometra in cats vary depending on the type of condition (open or closed), but, in general, they can be subtle at first and can progress rapidly as the infection advances. It is essential for cat owners to recognize the signs as early as possible, as pyometra is a medical emergency.

Abnormal vaginal discharge (in open pyometra)

In open pyometra, the cervix is dilated, allowing accumulated pus to drain from the uterus. This leads to the appearance of vaginal discharge that may have the following characteristics:

• Yellow, brown, or even reddish color (due to mixing with blood);
• Unpleasant, strong odor;
• Abundant discharge, noticeable on the fur, in the genital area, or on surfaces where the cat lies down.

Cats may excessively lick their genital area to remove secretions, a sign that may go unnoticed.

Swollen and painful abdomen (in closed pyometra)

In closed pyometra, the cervix remains closed, and pus accumulates in the uterus without being able to drain. This accumulation causes abdominal distension (swelling), which can become sensitive and painful. As the uterus enlarges, it may even threaten to rupture, causing a major medical emergency.

Lethargy and apathy

Cats affected by pyometra often become apathetic and lethargic. They lose interest in their usual activities and prefer to stay in a quiet place. This symptom is common in both forms of pyometra and indicates a general deterioration of health.

Loss of appetite

One of the common signs is decreased appetite or even anorexia. Sick cats may refuse to eat, and this can be aggravated by associated symptoms: fever or abdominal pain.

Excessive thirst (polydipsia) and frequent urination (polyuria)

Cats with pyometra may develop an imbalance in kidney function due to severe infection. This leads to increased thirst and frequent urination. Polydipsia and polyuria are common symptoms in cases of severe infections affecting internal organs.

Fever

Fever may occur as the body's response to infection. Although not present in all cases, a cat with a fever will feel generally unwell and be less active.

Vomiting and diarrhea

In advanced cases, pyometra can cause gastrointestinal symptoms such as vomiting and diarrhea. These usually occur in the severe stages of the disease when the infection begins to spread and affect the entire body.

Dehydration and weight loss

Sick cats may start to lose weight due to lack of appetite and dehydration, which worsens as the infection progresses.

Diagnosis of pyometra

Diagnosing pyometra is essential to determine the presence and severity of the uterine infection, as well as to quickly decide on the best treatment. Since symptoms can vary and be subtle, especially in closed pyometra, correct and prompt diagnosis is vital for saving the cat's life.

Clinical examination

The first step in diagnosis is a careful evaluation of the cat's medical history. The veterinarian will ask about:

• The cat's last heat period;
• Whether hormonal contraceptives were used to prevent estrus;
• Whether the cat has recently given birth or had other reproductive problems;
• Recent changes in behavior or health status (lethargy, loss of appetite, vaginal discharge).

A detailed physical examination is another important step. The veterinarian will check for:

• Presence of vaginal discharge (in open pyometra);
• Abdominal swelling, which may suggest pus accumulation in the uterus (in closed pyometra);
• General signs of infection, such as fever, dehydration, lethargy, and abdominal discomfort. Cats with pyometra are often very sensitive to abdominal palpation, which may suggest an enlarged or inflamed uterus.

Suspicion of pyometra requires confirmation through other tests and analyses, in the case of closed pyometra.

Diagnostic tests

Blood tests are useful for detecting signs of systemic infection or organ damage due to pyometra:

• Increased white blood cell count: this is a classic indicator of infection, and a high level may suggest a severe bacterial infection.
• Anemia: may be present in advanced cases of pyometra.
• Changes in kidney function: pyometra can affect the kidneys, and blood tests may show dysfunction at this level.

Abdominal ultrasound

Ultrasound is the most accurate test for diagnosing pyometra. With the help of ultrasound, the veterinarian can visualize the uterus and observe if there are accumulations of pus. Ultrasound can differentiate between pyometra and other conditions that can cause similar symptoms, such as pregnancy or uterine tumors. In the case of closed pyometra, this is the preferred method for visualizing the size and extent of the infection.

Abdominal radiography

Although less accurate than ultrasound, radiography can be used to detect an enlarged uterus, which may be filled with pus. Radiography can be useful in cases where ultrasound is not available, but it may not provide a clear diagnosis in all situations.

Examination of vaginal discharge (in open pyometra)

In open pyometra, the veterinarian can examine vaginal discharge to assess the presence of bacteria and pus. This can help confirm the infection and identify the type of bacteria involved.

In some cases, the veterinarian may collect samples from the uterus or vaginal secretions for a bacteriological examination. This test allows the identification of the exact type of bacteria causing the infection and can help in choosing appropriate antibiotics.

Treatment of pyometra

Pyometra is a serious condition that requires emergency treatment. The most effective solution is surgical intervention, but depending on the cat's general condition and the type of pyometra (open or closed), there are also medicinal options. Prompt treatment is essential to prevent severe complications, such as uterine rupture or sepsis, which can be fatal.

Surgical treatment: ovariohysterectomy (spaying)

The most common and effective treatment method for pyometra is ovariohysterectomy (or complete spaying), which involves the removal of the uterus and ovaries. This surgical intervention is considered standard, especially in closed pyometra, as it eliminates the source of infection and prevents recurrences.

The cat is placed under general anesthesia to perform the procedure. The veterinary surgeon will make an incision in the abdominal area and remove both the infected uterus and the ovaries. This is a relatively common procedure in veterinary medicine.

Surgical treatment offers important advantages. First, once the uterus is removed, the risk of recurrence is eliminated. In addition, ovariohysterectomy prevents the occurrence of other reproductive or hormonal problems in the future.

Medicinal treatment

In very rare cases, when pyometra is in its early stages and the cat is a candidate for breeding, medicinal treatment may be attempted. This is not the first recommended option, as the risks and success rate are limited. Medicinal treatment includes the use of antibiotics and drugs that induce uterine contractions to evacuate pus from the uterus.

Prostaglandins are drugs that induce uterine contractions and help eliminate pus, but they are effective only in cases of open pyometra when the cervix is dilated. This treatment is risky and requires constant monitoring to avoid complications.

Antibiotics are used to combat bacterial infection. However, they are not a definitive solution, as they cannot completely eliminate pus from the uterus, and the infection may recur. Antibiotics are also administered in preparation for surgery to stabilize the cat and reduce the risk of sepsis.

Medicinal treatment requires continuous monitoring of the cat, as there is a risk that the infection may progress rapidly if pus is not effectively eliminated. If the cat does not respond well to medication, surgical intervention will be recommended.

Recovery after treatment

After treatment for pyometra, whether it was surgical intervention (ovariohysterectomy) or medicinal treatment, the cat requires careful care and constant monitoring to ensure a complete recovery. Here are the details regarding postoperative care, health status monitoring, and possible complications that may arise after treatment.

Postoperative care

After surgery, the cat requires careful supervision, which includes:

• Incision check: it is important to monitor the incision to ensure it is healing correctly. The incision should be clean, without signs of excessive redness, swelling, or unusual discharge.
• Area cleaning: generally, the incision area should not get dirty, but if it does, gently clean the area with sterile saline solution or as directed by the veterinarian.
• Prevent licking: the cat may be tempted to lick the incision, which can lead to infections. In this case, it is recommended to use an Elizabethan collar to prevent her from reaching the operated area.
• Antibiotics: if the veterinarian has prescribed antibiotics to prevent infections, make sure to administer them as directed. Do not interrupt the treatment even if the cat seems to feel better.
• Painkillers: administer pain medication as prescribed to ensure the cat's comfort. Do not use human medication, as these can be toxic to cats.
• Keep an easily digestible diet: after surgery, the cat may have a reduced appetite. Offer easily digestible food and make sure she has constant access to fresh water. Pay attention to the amount of food and water consumed. Any significant decrease in food or water intake can be a sign of complications.
• Limit movement: prevent the cat from excessive physical exertion. Do not let her jump or run until the veterinarian deems it safe to do so. Provide her with a comfortable and quiet resting place, in warmth.

During the convalescence period, cats may have a capricious appetite, and their digestion may be upset. Wet cat food is a tastier alternative, which also provides extra hydration and is more easily accepted!

Monitoring health status

Careful monitoring of the cat must extend beyond the first 48 hours post-surgery, until complete healing.

• Temperature: measure the cat's temperature to check if it is within normal limits (generally between 38-39°C). An increased or decreased temperature can indicate postoperative problems.
• Respiration and pulse: monitor the cat's respiratory rate and pulse. Any significant changes can indicate complications.
• Lack of appetite: if the cat continues not to eat or drink water after a few days, inform the veterinarian.
• Lethargy: a certain degree of lethargy is normal after surgery, but if the cat becomes extremely lethargic or refuses to move, you should contact the veterinarian.
• Signs of infection: check for signs of infection, such as excessive redness, purulent discharge, or swelling around the incision.

Possible postoperative complications

Complications after spaying in cats are rare, but when the intervention is performed in the presence of pyometra, the doctor will recommend a higher level of caution, especially if the feline's health has been affected for several days.

In the case of pyometra surgery, the risk of infection and sepsis is higher than in the case of a simple spaying. Anesthesia in cats can, in rare cases, cause some accidents, and the risk is higher if renal function is altered by the existing infection.

Similar to any other surgical intervention, there are risks related to wound healing; it can become infected if not properly cared for, there is a possibility that the cat will lick until the sutures are removed or that healing will be slower than expected.

Pyometra Prevention

Pyometra prevention is essential to protect cats from this serious condition and to ensure them a long and healthy life. The main preventive measures include spaying the cat, avoiding hormonal contraceptives, and careful monitoring of unspayed cats.

If you find it difficult to make decisions regarding your cat's health and have questions you would prefer to hear answers from several specialists, contact an experienced veterinarian through our form!

Spaying the cat

Spaying (or ovariohysterectomy) is the most effective preventive measure against pyometra. By removing the uterus and ovaries, the risk of developing this condition is completely eliminated, as there are no reproductive tissues that can be infected.

• Spaying prevents hormonal changes associated with the reproductive cycle, which can contribute to the development of pyometra.
• In addition to preventing pyometra, spaying reduces the risk of mammary tumors and other reproductive problems.
• Spaying helps control the cat population, preventing unwanted births and contributing to the reduction of homeless pets.

Spaying can usually be done at 5-6 months of age, before the first heat, but it can also be performed on adult cats. The intervention is easier to manage in younger and healthier cats, but it is valid at any time if it has not been done before.

Avoiding hormonal contraceptives

Hormonal contraceptives are used to prevent estrus (heat) in cats, but these can induce hormonal changes that increase the risk of pyometra.

• Contraceptives contain hormones that can stimulate the development of uterine secretions, creating a favorable environment for infections.
• Studies show that cats that receive long-term hormonal treatments are more susceptible to pyometra, as well as the appearance of mammary cancer.

Careful monitoring of the health of unspayed cats

For cats that have not been spayed, careful monitoring of their health can help early identification of problems and prevention of complications.

• Monitor any abnormal secretions, especially if they are yellow, brown, or have an unpleasant odor.
• Watch for signs of lethargy, loss of appetite, excessive thirst, or other behavioral changes that may indicate a health problem.
• Perform regular veterinary check-ups to assess the cat's overall health and detect health problems in their early stages.
• If the cat goes into heat frequently, discuss with the veterinarian about possible hormonal evaluations and associated risks.

Frequently Asked Questions

There are a number of questions that cat owners frequently ask the veterinarian, which we will answer below.

Can my cat get pyometra even if she has only had one heat cycle?

Yes, your cat can develop pyometra even after a single heat cycle. Although the risk of pyometra increases with each heat cycle, even a single hormonal exposure can contribute to the development of uterine infection. Pyometra is often linked to the hormonal changes that occur during and after the heat period.

Is there an alternative to spaying to prevent pyometra?

Spaying is the only effective method of preventing pyometra.

How quickly should I take my cat to the vet if I suspect pyometra?

Pyometra is a veterinary emergency, which is why it is essential to take your cat to the vet as soon as you suspect she might have this diagnosis. In the absence of prompt and correct intervention, your cat is in danger of losing her life.

Pyometra in cats is a serious condition that requires attention and rapid action. By spaying, avoiding hormonal contraceptives, and careful monitoring of unspayed cats, you can significantly reduce the risks. If you notice symptoms of pyometra, take your cat to the vet immediately to prevent serious complications. Understanding and implementing preventive measures not only protects the cat's health but also contributes to improving her quality of life. With proper management and adequate treatments, your cat can have a long and happy life, without unnecessary risks.

Sources:

1. https://www.petmd.com/cat/conditions/reproductive/signs-pyometra-cats
2. https://vcahospitals.com/know-your-pet/pyometra-in-cats
3. https://www.webmd.com/pets/cats/what-is-pyometra-in-cats

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