TL;DR: Sudden hind limb weakness in cats is a life-threatening medical emergency often caused by a blood clot, requiring immediate veterinary intervention.
What does sudden hind limb weakness look like in my cat?
Sudden back leg weakness or paralysis in cats, also known as hind limb paresis, occurs when a cat unexpectedly loses the ability to use their rear legs. This can manifest as dragging the legs, unsteadiness, or a complete inability to stand. While it can be caused by spinal injuries or neurological issues, it is frequently associated with cardiovascular problems in felines.
Is sudden back leg weakness in cats a medical emergency?
- High-Priority Emergency: Sudden paralysis is often caused by Feline Aortic Thromboembolism (FATE), or a 'Saddle Thrombus.'
- Life-Threatening Condition: This occurs when a blood clot blocks blood flow to the back legs and is extremely painful.
- Check for Physical Signs: Feel if your cat's paws are cold to the touch or if the nail beds have a bluish tint.
- Immediate Action Required: Seek veterinary care at an emergency 24-hour clinic immediately if these symptoms occur.
How can photos and videos help a veterinarian triage my cat’s condition?
- Visual Assessment: A quick video of your cat's movement or a photo of their posture helps the triage team assess gait abnormalities.
- Identify Distress: Visuals allow staff to check for signs of respiratory distress or pain before you arrive.
- Advance Preparation: Providing media helps the medical team prepare necessary diagnostic tools and pain management protocols in advance.
Clinical Context (Merck Veterinary Manual)
Sudden back leg weakness in cats can be caused by arterial thromboembolism, spinal column and cord diseases (including congenital, degenerative, inflammatory, infectious, neoplastic, nutritional, traumatic, toxic, and vascular disorders), and cervical spondylomyelopathy. Arterial thromboembolism is often characterized by extreme pain and firm gastrocnemius muscles, with the cat able to move the legs above the stifles, and tail function typically unaffected; diagnosis is based on clinical signs, physical examination, and Doppler blood flow readings of the hindlimbs. Spinal column and cord diseases involve a wide range of etiologies affecting the integrity and function of the spinal cord. Cervical spondylomyelopathy involves compression of the spinal cord due to abnormal cervical vertebrae development.
Chapter: Cardiology
Source: The Merck Veterinary Manual, 11th Edition (Page 1245)