Hypertension in Cats

Hypertension in Cats

By: PetPlace Veterinarians

Section: Veterinary Care In-depth

Veterinary care should include diagnostic tests and subsequent treatment recommendations.

Diagnosis In-depth

Diagnostic tests are needed to recognize hypertension and exclude other diseases. Tests may include:

  • Repeated measurements of arterial blood pressure using a Doppler flow device or an oscillometric device

  • Complete medical history and physical examination

  • Examination directed to the potential causes of hypertension and to the organs injured by high blood pressure

  • A neurological examination

  • Ophthalmoscopic examination

  • Examination of the heart to include physical diagnosis using a stethoscope, chest X-rays or an echocardiogram (ultrasound of the heart).

  • Kidney exam, including physical examination, blood tests, urinalysis and diagnostic imaging, X-rays or ultrasound

    Additional diagnostic tests may be recommended on
    an individual basis, including:

  • Identification of the underlying cause of hypertension. This may require a variety of laboratory tests including blood tests of endocrine function, specialized X-rays or ultrasound examination of abdominal organs.

  • Detailed urine analyses for identification of some forms of kidney disease.

    Treatment In-depth

    Treatments for hypertension may include one or more of the following:

    The principles of therapy include management of the underlying cause of hypertension and lowering of the arterial blood pressure. Treatment must be individualized for the patient and the associated problems and may include one or more of the following:

  • Hypertensive crisis (very high blood pressure with severe clinical signs such as stroke, impaired consciousness or blindness) should be treated aggressively in the hospital with drugs that lower blood pressure. The potent intravenous vasodilator drug, sodium nitroprusside, may be used for this purpose. Sodium nitroprusside must be carefully administered and this may require transfer to an emergency hospital. Diuretics, amlodipine or other vasodilator drugs (hydralazine) can also be used in a hypertensive crisis.

  • Hypertension in cats is relatively common. The best therapy at this time appears to be the calcium channel blocker, amlodipine. This pill is given once or twice daily and must be broken to achieve correct the dose. If this is ineffective, other treatments such as those used in dogs may be considered.

  • Most people are familiar with treating hypertension initially using weight reduction and exercise programs and decreases in dietary sodium intake. Unfortunately, these measures are rarely, if ever, effective in controlling hypertension in cats. Certainly, a reduction in dietary sodium (salt) is appropriate for most patients, but diet alone will not be enough.

  • Management of hypertension may never be completely successful unless the underlying cause can be managed. This can be difficult with certain diseases or tumors of the adrenal gland.

  • Organs injured by hypertension may recover in some cases once the blood pressure is controlled. In other situations, the prognosis for neurologic function, sight and cardiac function depends on the duration of clinical symptoms.

     
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