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Table of Contents
- What is Restrictive Cardiomyopathy (RCM)?
- What are the causes of restrictive cardiomyopathy (RCM)?
- Which cats have restrictive cardiomyopathy (RCM)?
- What are the symptoms of restrictive cardiomyopathy (RCM)?
- How is restrictive cardiomyopathy (RCM) diagnosed?
- What is thromboembolism?
- What is the prognosis (course) of restrictive cardiomyopathy?
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What is Restrictive Cardiomyopathy (RCM)?
When all or part of the heart muscle stiffens, the heart cannot fill with enough blood. This causes fluid accumulation, first in the left and right atria, then in the pulmonary circulation or throughout the body. As a result pulmonary edema (fluid accumulation in the lungs), pleural effusion (fluid accumulation in the chest cavity) or acid (fluid accumulation in the abdominal cavity) may develop.
What are the causes of restrictive cardiomyopathy (RCM)?
Restrictive cardiomyopathy (RCM) The exact cause is unknown. However, sometimes cats with hypertrophic cardiomyopathy may develop a restrictive pattern or RCMcan turn into.
Which cats have restrictive cardiomyopathy (RCM)?
RCM is one of the relatively common acquired heart diseases diagnosed in cats. However, no breed predisposition is known. Many non-pedigree cats, such as crossbreds, are also affected by this disease.
What are the symptoms of restrictive cardiomyopathy (RCM)?
Heart disease in cats is difficult to detect in the early stages, as typical symptoms seen in dogs, such as coughing or poor performance, rarely occur in cats.
In the advanced stages of the disease, shortness of breath is often seen and may present as panting. This is an important warning sign that should be evaluated by a veterinarian.
Other signs and symptoms of heart disease include:
• Loss of appetite
• Increased need for sleep and rest
• Significant decrease in desire to play and stamina
• Rapid breathing, marked by tension in the abdominal area
• Breathing with open mouth after exertion
• Bluish mucous membranes
• Accelerated and noticeable heartbeats
• Increase in shapeless size due to fluid accumulation in the body
If these symptoms are noticed, it is recommended to have the animal examined by a veterinarian immediately. Paralysis that can be seen in the arms and legs, may be an indicator of thrombosis in cats. Coughing is a rare symptom in cats, but is one of the early warning signs of heart failure in dogs and humans.
How is restrictive cardiomyopathy (RCM) diagnosed?
Restrictive cardiomyopathy (RCM) in cats Diagnosis and evaluation are made with a multifaceted approach:
1. First Step: Veterinarian Examination
Your veterinarian will first perform a general clinical examination and listen to the heart and lungs. Heart murmurs are a common indicator of heart disease, but it is only possible to distinguish harmless murmurs from murmurs caused by hypertrophic cardiomyopathy (and rarely restrictive cardiomyopathy). Heart ultrasound It is possible with. However, Most cats with RCM do not have a murmur.
Cats with RCM may also experience arrhythmias, or an irregular rhythm called a gallop rhythm.
2. Electrocardiography (ECG)
The ECG provides information about the frequency levels and the type and frequency of cardiac arrhythmias, such as >200 beats per minute. If additional beats, pauses, or gallop rhythms are noted in the heart, an ECG should be performed.
3. X-Ray Imaging
Chest X-rays may show advanced signs of conditions such as an enlarged heart, congestive effusion in the chest, or fluid accumulation in the lungs (pulmonary edema). However, because RCM involves muscle stiffening, significant enlargement of the heart chambers is usually not seen. However, cases where both atria (and rarely one) are severely enlarged can sometimes be detected on X-rays.
4. Definitive Diagnosis: Echocardiography (Heart Ultrasound)
Echocardiographyis the preferred method for definitive diagnosis of RCM. This method provides detailed information about the dimensions of the cardiac chambers and walls, muscle contractility, and ejection capacity.
Special Method: Tissue Doppler Ultrasound
Tissue Doppler examination determines whether the heart is expanding normally or delayed in diastole (relaxation phase). This method is essential for the accurate diagnosis of RCM and is performed with modern ultrasound equipment. Tissue Doppler ultrasound can show significantly reduced diastolic waves (e' and a'), which are typical indicators of a restrictive pattern.
5. Additional Value of Doppler Ultrasound
The Doppler method determines the direction and speed of blood flow and has an important role in the diagnosis of heart murmurs. It is also the only method that allows the detection of thrombus formation (blood clot) in the atria.
6. Differentiating Types of Cardiomyopathy
Echocardiography makes it possible to distinguish between types of feline cardiomyopathy, such as hypertrophic, dilated, and restrictive cardiomyopathies, thus helping to establish the correct treatment plan.
What is thromboembolism?
One of the feared complications in cats is, is the formation of blood clots in the left atriumThese clots can break apart and enter the bloodstream, blocking some vessels. Thromboembolism The most common place where this condition, called are the femoral arteries.
Cats with thromboembolism are usually in severe pain and unable to move one or both hind legs. This presents as flaccid paralysis of one or both hind limbs and is both extremely painful and prognostically unfavorable.
When such signs are noticed, a veterinarian should be consulted as soon as possible. With early intervention, these thrombi can be resolved and serious complications can be prevented.
What is the prognosis (course) of restrictive cardiomyopathy?
weather, varies depending on the severity of the disease, the complications that develop, and the individual response of the animal to treatment. Cats generally cannot give a definitive prognosis, as they respond very individually, especially to complications. Occurrence of thromboembolismis considered an extremely unfavorable sign from a prognostic perspective.
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