Cat Feline Aortic Thromboembolism: Prevention and Crisis

Aortic thromboembolism is a painful emergency in cats with heart disease, causing sudden hind limb paralysis requiring urgent welfare assessment.

Key Facts

FATE occurs when blood clots form in the heart and lodge in the aorta, blocking blood flow to hindlimbs
It almost exclusively affects cats with underlying hypertrophic cardiomyopathy or other heart disease
Clinical signs include sudden hind limb paralysis with cold, painful limbs and vocalization from pain
The classic presentation of 'saddle thrombus' blocks both femoral arteries causing bilateral rear limb paralysis
Without treatment, cats are often euthanized at presentation due to poor prognosis historically
Newer anticoagulation and thrombolytic therapies have improved outcomes for some cats
Survivors face cardiac management and recurrence risk - clopidogrel reduces but doesn't eliminate recurrence

Welfare Considerations

FATE is one of the most acutely distressing veterinary emergencies - cats experience sudden onset of severe pain from ischemia combined with complete loss of hindlimb function. Pain management is the immediate welfare priority. The prognosis discussion must balance the potential for meaningful recovery against the welfare cost of treatment for potentially terminal cardiac disease. Humane euthanasia is an appropriate welfare choice when prognosis is poor and suffering severe.

What You Can Do

Screen cats with murmurs for hypertrophic cardiomyopathy with echocardiography to identify FATE risk
Discuss preventive anticoagulation with clopidogrel for cats with known high-risk cardiac disease
Recognize FATE as an emergency requiring immediate veterinary care and pain management
Have an honest prognosis conversation with your vet to make informed welfare-centered decisions
Support HCM genetic testing in Maine Coon and Ragdoll cats to identify at-risk individuals
Donate to feline cardiology research improving treatment and prevention of FATE