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Spontaneous Coronary Artery Dissection (Tear in the Vessel Wall of a Coronary Artery) in Dogs

Occurrence: very rare
Location of illness: Chest

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

Spontaneous coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. dissection in dogs is a sudden tear in the vessel wall of a coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. that can impair blood flow to the heart.

The most important facts at a glance

Spontaneous coronary artery dissection in dogs is a rare and serious condition in which the layers of the vessel wall of the coronary arteries separate, which can impair blood flow to the heart. This can lead to ischemiaIschemia refers to an inadequate blood supply to an organ or tissue, leading to a reduction in oxygen and nutrient supply. Ischemia can lead to tissue damage or death if left untreated. of the heart tissue or a heart attack. The exact causes are not fully understood, but factors such as blood pressure changes, structural weaknesses in the vessel wall, and inflammatory conditions could be triggers. A genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. and existing cardiovascular diseases could increase the risk.

Symptoms can be severe Schmerzen, Erbrechen, loss of appetite, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, and in the worst case, sudden Tod. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. requires a comprehensive examination by a veterinarian, including ECG, imaging techniques such as echocardiogram or angiographyangiography is an imaging technique that uses a contrast agent to visualize blood vessels. It is used in veterinary medicine to diagnose blood vessel diseases in dogs and cats., and blood tests. Treatment depends on the severity of the condition and may include medications to lower blood pressure, pain relievers, oxygen therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions., or, in severe cases, surgical interventions.

The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. varies depending on the severity of the dissection and the dog’s general health. Early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment are crucial for a good recovery. For preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring., a balanced diet, regular exercise, and avoiding Übergewicht can contribute. Research focuses on better understanding genetic predispositions and physiological mechanisms to improve diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment.

Causes

The coronary vessels, also known as coronary arteries, are vital blood vessels that supply the heart muscle with oxygen and nutrients. A dissection of these vessels means that the layers of the vessel wall separate from each other, which can lead to impaired blood flow. In severe cases, this can lead to ischemiaIschemia refers to an inadequate blood supply to an organ or tissue, leading to a reduction in oxygen and nutrient supply. Ischemia can lead to tissue damage or death if left untreated. of the heart tissue or a heart attack.

The exact causes of spontaneous coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. dissection in dogs are not fully understood, as they are relatively rarely documented compared to humans. However, it is believed that certain anatomical and physiological factors may play a role. Changes in blood pressure, structural weaknesses in the vessel wall, or inflammatory conditions could be possible triggers.

Another possible factor could be a genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. that increases susceptibility to vascular damage. Dogs with a known cardiovascular disease or a historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. of heart problems may also be at higher risk.

Symptoms

Very common symptoms:

Common symptoms:

The symptoms of spontaneous coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body’s tissues. dissection in dogs can vary, depending on the severity of the dissection and the affected vessels. In many cases, the symptoms can occur suddenly and be severe.

Common signs include sudden weakness or collapse, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, bluish mucous membranes due to lack of oxygen, and in severe cases, sudden cardiac arrest. Some dogs may show Unruhe or Schmerzen, which could indicate chest pain.

Since these symptoms can also occur with other cardiovascular diseases, it is important to have an accurate diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. made by a veterinarian.

Diagnosis

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of spontaneous coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. dissection requires a comprehensive clinical examination by a veterinarian as well as special diagnostic procedures. An electrocardiogramSee ECG. (ECG) can help detect abnormal electrical activity in the heart that could indicate impaired blood supply.

Imaging techniques such as an echocardiogram or angiographyangiography is an imaging technique that uses a contrast agent to visualize blood vessels. It is used in veterinary medicine to diagnose blood vessel diseases in dogs and cats. can also be useful in assessing the structure and function of the coronary vessels. In some cases, computed tomography (CT)Computed tomography (CT) is an imaging technique that uses X-rays and computer technology to create cross-sectional images of the body. It enables a detailed view of bones, organs, and other structures and is used for the diagnosis of injuries, diseases, and for planning medical interventions. or magnetic resonance imaging (MRI)Magnetic resonance imaging is an imaging technique that uses strong magnetic fields and radio waves to create detailed images of the inside of the body. It is used in veterinary medicine to diagnose diseases of the brain, spine, and other organs. may be used to obtain detailed images of the heart and surrounding vessels.

In addition, blood tests can be performed to identify markers for heart damage or Entzündungen.

Therapy

The treatment of spontaneous coronary artery dissection in dogs depends on the severity of the condition and the specific needs of the affected animal. In acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. cases, emergency medical intervention may be required to stabilize heart function and avoid complications.

Medications to lower blood pressure, pain relievers, and oxygen therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. may be used to relieve symptoms and improve blood flow to the heart. In severe cases, surgical intervention may be required to repair or replace the affected section of the arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues..

In the long term, therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. to control blood pressure and heart rate may be necessary to minimize the risk of recurrence.

Prognosis and follow-up care

The prognosis for dogs with spontaneous coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. dissection can vary greatly. With early diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment, some dogs can recover well and achieve a normal quality of life. However, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. depends on the severity of the dissection, the affected artery, and the dog’s general health.

In severe cases, especially if a heart attack has occurred, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. may be less favorable. Close monitoring and follow-up by a veterinarian are crucial to prevent the progression of the disease and improve the dog’s quality of life.

Prevention

Since the exact causes of spontaneous coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. dissection are not fully known, there are no specific measures for preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring.. Nevertheless, general measures to promote heart health can reduce the risk of cardiovascular diseases in dogs.

A balanced diet, regular exercise, and avoiding Übergewicht can help maintain a healthy cardiovascular system. Regular veterinary examinations are important to detect and treat signs of heart problems early.

For dogs with a genetic predisposition or a historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. of heart problems, close monitoring and, if necessary, preventive medical treatment could be useful.

Outlook on current research

Spontaneous coronary artery dissection (SCAD) is a rare but serious condition that is not common in dogs. The mechanism of the disease is not yet fully understood, and research in this area is limited, especially compared to human medicine. Scientists are working to better understand the underlying causes and risk factors in order to improve diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. and treatment.

A significant part of current research focuses on identifying genetic predispositions that could make dogs susceptible to SCAD. It is believed that genetic factors could play a role, similar to what is the case in humans. Researchers are examining different dog breeds to find possible genetic markers that are associated with the disease.

Another area of research deals with the physiological mechanisms that could lead to a dissection of the coronary arteries. It is being investigated whether certain hormonal or inflammatory processes are involved. These studies could also provide information about potential therapeutic approaches that could reduce the risk or severity of the dissection.

In clinical research, there are efforts to develop better diagnostic methods. Currently, the diagnostic options for SCAD in dogs are limited, and the disease is often only discovered after severe symptoms have occurred. Advances in imaging diagnostics could help to detect SCAD earlier and more accurately.

In the long term, researchers hope to develop targeted preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies through a better understanding of the disease and its mechanisms. This could significantly improve the treatment outcomes for affected dogs and increase the quality of life of these animals.

Frequently asked questions (FAQs)

What is spontaneous coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. dissection in dogs? Spontaneous coronary arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. dissection (SCAD) in dogs is a sudden tear in the wall of a coronary artery that can impair blood supply to the heart. This can lead to serious heart problems and, in severe cases, to Tod.
How common is SCAD in dogs? SCAD is very rare in dogs. Most cases of heart problems in dogs are caused by other causes such as heart valve diseases or cardiomyopathies. Since SCAD is not frequently diagnosed, there is limited information about its prevalence.
What symptoms may indicate SCAD in dogs? Symptoms of SCAD can be sudden weakness, fainting, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, irregular heartbeat, or even sudden Tod. Since these symptoms can also occur with other heart problems, an accurate diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. by a veterinarian is necessary.
How is SCAD diagnosed in dogs? The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of SCAD in dogs can be challenging. Veterinarians typically use a combination of clinical signs, ECGs, blood tests, and imaging techniques such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or CT scans, although these are not always conclusive.
What causes SCAD in dogs? The exact causes of SCAD in dogs are not yet fully understood. It is believed that genetic factors, hormonal influences, or inflammatory processes could play a role. Further research is needed to better understand these causes.
Can certain dog breeds be more susceptible to SCAD? Currently, there are no specific dog breeds that have been clearly associated with a higher risk for SCAD. However, research in this area is ongoing to identify possible genetic predispositions.
How is SCAD treated in dogs? The treatment of SCAD in dogs depends on the severity of the condition. In some cases, drug therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. to stabilize the cardiovascular system may be sufficient. In more severe cases, invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. procedures may be necessary, although these are less commonly used in animals.
Can SCAD be prevented in dogs? Since the exact causes of SCAD are not fully known, there are no specific preventive measures. However, general monitoring of heart health and regular veterinary check-ups can help to monitor general heart health and respond to problems early.
Are there long-term consequences for dogs suffering from SCAD? Dogs who survive SCAD may develop long-term heart problems, depending on the severity of the tear and the rapid treatment. Continuous veterinary monitoring and, if necessary, permanent medication may be necessary to maintain their quality of life.
Is SCAD in dogs a life-threatening disease? Yes, SCAD can be life-threatening for dogs, especially if it is not diagnosed and treated in time. The disease can lead to sudden cardiac arrest, which is why rapid veterinary care is crucial.