Cat Arterial Thromboembolism Emergency Care

Feline arterial thromboembolism is a devastating emergency causing sudden hindlimb paralysis and extreme pain, most commonly as a complication of hypertrophic cardiomyopathy.

Key Facts

ATE occurs when a thrombus from the left atrium lodges in the aortic trifurcation or other arteries
Affected cats show acute hindlimb paralysis, cold limbs, absent pulses, and intense pain
The condition is most commonly associated with HCM and dilated cardiomyopathy
Prognosis is guarded to poor: approximately 40 to 50 percent of cats do not survive the acute episode
Survivors face risk of recurrence, particularly without prophylactic antiplatelet therapy
Clopidogrel is the preferred antiplatelet agent for ATE prevention in cats with HCM

Welfare Considerations

ATE causes one of the most acute and severe welfare emergencies in feline medicine. Affected cats experience extreme pain from ischaemia of the paralysed limbs, combined with the distress of sudden loss of normal function. The decision whether to pursue aggressive treatment or euthanasia is one of the most difficult in emergency feline medicine. Euthanasia is appropriate when cats are in extremis and prognosis is very poor. For cats that are stabilised, the welfare priority is pain management, treatment of underlying heart disease, and prevention of recurrence through antiplatelet therapy.

What You Can Do

Seek emergency veterinary care immediately if your cat shows sudden hindlimb weakness or paralysis
Discuss the euthanasia option honestly with your vet if your cat is suffering severely with poor prognosis
Ensure echocardiographic assessment is performed to identify and treat underlying heart disease
Start clopidogrel therapy in surviving cats to reduce the risk of recurrence
Discuss regular cardiac monitoring with your vet to detect progression of HCM before ATE occurs