Systemic Hypertension in Dogs (Arterial Hypertension)
- Synonyms: High blood pressure, arterial hypertension, aHT
- Occurrence: common
- Location of disease: General/Whole body
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Arterial Hypertension in dogs, also known as systemic hypertension, is a condition in which blood pressure in the arteries is chronically elevated. This condition can lead to serious health problems if left untreated.
Das Wichtigste auf einen Blick
Arterial Hypertension in dogs arises from a disruption in the regulation of cardiac output, vascular resistance, and blood volume. Primary hypertension is rare and occurs without an identifiable cause, while secondary hypertension is more common and is caused by underlying diseases such as chronic kidney diseases, Cushing’s syndrome, or diabetes mellitus. Symptoms can range from Restlessness and Panting to more severe signs like retinal detachment or Blindness. Diagnosis is made by measuring blood pressure in a stress-free environment, as well as through blood and urine tests to identify underlying causes. Therapy aims to treat the underlying disease but may also include blood pressure-lowering medications such as ACE inhibitor and calcium channel blockers. A low-salt diet and weight reduction can also help. The prognosis depends on the cause and timely diagnosis, with untreated hypertension potentially leading to complications. Preventive measures focus on avoiding underlying diseases through regular veterinary examinations, a balanced diet, and a healthy body weight. Research into arterial hypertension in dogs investigates risk factors, genetic predispositions, and the optimization of therapy methods to improve the quality of life for affected dogs.
Ursachen
Arterial blood pressure is regulated by the interplay of cardiac output, vascular resistance, and blood volume. In dogs, as in humans, a certain blood pressure is necessary to supply the body with sufficient oxygen and nutrients. Blood pressure is measured in millimeters of mercury (mmHg) and consists of two values: systolic and diastolic pressure. Systolic pressure is the higher value and occurs when the heart pumps blood into the arteries; diastolic pressure is the lower value, indicating the pressure between heartbeats.
Normally, blood pressure is kept in balance by various mechanisms in the body. These include the nervous system, hormonal controls, and kidney function. If one of these control mechanisms is disturbed, it can lead to a permanent increase in blood pressure.
The causes of arterial hypertension in dogs can be primary or secondary. Primary hypertension, also called essential hypertension, occurs without an identifiable cause and is rare in dogs. More common is secondary hypertension, which is the result of an underlying disease.
Common causes of secondary hypertension in dogs include chronic kidney diseases, endocrine disorders such as Cushing’s syndrome, and diabetes mellitus. Certain medications and a diet too high in salt can also increase blood pressure. In some cases, Overweight can also contribute to high blood pressure.
Symptoms
The symptoms of arterial hypertension in dogs are often non-specific and can be easily overlooked. Owners often only notice symptoms when complications have already occurred. Possible symptoms include increased Lethargy, Respiratory distress, nosebleeds, and behavioral changes, such as sudden Aggressiveness or confusion.
Further symptoms may include reduced vision or even Blindness, as the increased pressure can damage the blood vessels in the retina of the eyes. In severe cases, neurological symptoms such as seizures can occur if the elevated blood pressure affects the brain vessels.
The combination of thirst and increased urination (polyuria and polydipsia), nosebleeds, or sudden vision problems is suspicious.
Diagnose
The diagnosis of arterial hypertension in dogs is primarily made by measuring blood pressure. This measurement should take place in a quiet environment, as stress can distort blood pressure readings. There are special blood pressure monitors for animals that allow for gentle and accurate measurement.
To confirm a diagnosis, several measurements on different days are often necessary. A single elevated reading can be caused by stress or excitement and does not necessarily indicate chronic hypertension.
In addition to blood pressure measurement, the veterinarian will usually perform blood and urine tests to identify possible underlying causes such as kidney disease or hormonal disorders. An ultrasound examination of the kidneys or an ECG can also be helpful to support the diagnosis and determine the extent of the disease.
Therapie
The therapy for arterial hypertension in dogs depends on the underlying cause. If an underlying disease, such as kidney disease or a hormonal imbalance, is responsible, this is treated primary. In many cases, this can lead to a normalization of blood pressure.
If a specific cause cannot be identified, or if hypertension persists despite treatment of the underlying disease, blood pressure-lowering medications are used. These include ACE inhibitor, which dilate blood vessels and thus lower blood pressure, as well as calcium channel blockers, which reduce muscle tension in the vessel walls.
In addition to drug treatment, dietary adjustments can be helpful. A low-salt diet can have a positive effect on blood pressure. In some cases, weight loss in overweight dogs can also have a positive effect on blood pressure.
Prognose und Nachsorge
The prognosis for dogs with arterial hypertension depends heavily on the underlying cause and timely diagnosis. If an underlying disease can be successfully treated, the prognosis is often good. For chronic conditions that are not fully curable, long-term therapy may be necessary to control blood pressure and prevent complications.
Untreated, arterial hypertension can lead to serious complications such as heart, kidney, and eye damage. Therefore, early diagnosis and therapy are crucial for a good quality of life for the affected dog.
Prävention
Since primary hypertension is rare in dogs, prevention measures primarily focus on avoiding and controlling underlying diseases that can cause secondary hypertension. Regular veterinary examinations are crucial to detect and treat conditions such as kidney problems or endocrine disorders early.
A balanced diet and a healthy body weight can also help reduce the risk of high blood pressure. A low-salt diet and regular exercise are important factors in keeping the cardiovascular system healthy.
For dogs who already suffer from diseases that increase the risk of high blood pressure, regular monitoring of blood pressure by the veterinarian is advisable in order to intervene early.
Ausblick auf aktuelle Forschung
Research into arterial hypertension in dogs has gained importance in recent years, as this condition often goes unrecognized and can have serious health consequences. The focus of current studies is on identifying risk factors and genetic predispositions that make dogs more susceptible to high blood pressure. Scientists are also investigating the effects of high blood pressure on various organ systems, particularly the kidneys, heart, and eyes, to improve the understanding of disease progression.
A number of studies are currently testing the effectiveness of various drug therapies, including the use of ACE inhibitor, calcium channel blockers, and other blood pressure-lowering medications commonly used in human medicine. Researchers are trying to find out which medications are most effective and how they can best be integrated into therapy protocols. Optimizing dosage and minimizing side effects are also central topics of ongoing research.
Another promising research area is the development of non-invasive diagnosis methods. Currently, blood pressure in dogs is often measured with inflatable cuffs, which can be stressful and distort measurement results. New technologies and procedures could enable more accurate and less burdensome measurements for the animal in the future. In addition, research is being conducted on how regular blood pressure measurements can be integrated into routine examinations to promote early detection of the disease.
Genetic research also offers interesting opportunities to understand the susceptibility of certain breeds to high blood pressure. By identifying genetic markers and changes, targeted breeding programs could be developed in the future that reduce the risk of inheritance of this disease. Some studies also deal with epigenetic factors that influence gene expression and may contribute to the development of high blood pressure.
In summary, research into arterial hypertension in dogs aims to improve both diagnosis and therapy. Through a better understanding of the underlying mechanisms and the development of new technologies, significant progress could be made in the coming years, which could significantly improve the quality of life of affected dogs.