What are the early signs of aortic thromboembolism?

Common early signs include rapid breathing, decreased activity, and sudden limb weakness or lameness. If severe respiratory distress or limb weakness develops, seek veterinary evaluation as soon as possible.

What tests will the vet perform at the clinic?

The vet will typically perform a physical examination along with blood and urine tests, and may use imaging such as CT or cardiac ultrasound to locate the thrombus and identify the possible underlying cause.

What can I do at home to prepare or in an emergency?

Keep your pet calm and warm, record and film their breathing and movement, save any relevant footage, and contact your vet promptly to arrange a visit.

What follow-up care is needed after discharge?

Follow your vet's instructions for return visits to monitor blood tests and imaging. Watch for changes in appetite, activity level, and limb function, take medications on schedule, and report any abnormalities promptly.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

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Disease Guide

Aortic Thromboembolism in Dogs & Cats: Symptoms, Diagnosis & Care [2025]

Aortic thromboembolism is a common feline emergency usually associated with heart disease, causing sudden hind limb paralysis that requires urgent treatment

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: ACVIM, ISFM, National Taiwan University Veterinary Hospital

When to See a Vet

Seek Emergency Care Immediately

•Sudden complete loss of strength in the hind limbs and inability to stand on their own
•Persistent rapid breathing or noticeably worsening labored breathing
•Dark purple gums or lips accompanied by confusion or altered mental status

Schedule a Clinic Visit Soon (within 24–72 hours)

•Noticeably slower movement and significantly reduced activity level
•Intermittent weakness or collapse in the hind or front limbs
•Persistent loss of appetite or refusal to eat for more than one day

01What symptoms indicate something is wrong?

Aortic thromboembolism often causes sudden respiratory distress or limb weakness — some cases are emergencies requiring immediate care.

Persistent or intermittent rapid breathing with obvious respiratory effort
Sudden weakness, difficulty walking, or lameness in the hind or front limbs
Marked decrease in activity level — reluctance to climb stairs or jump
Signs of pain or resistance when a specific area is touched
Cold limbs with noticeably low body temperature — monitor circulatory status
Mental dullness, lethargy, or slow responses

Seek emergency care immediately if you notice the following symptoms:

⚠️ Sudden complete loss of hind limb strength with inability to stand
⚠️ Persistent rapid breathing or worsening respiratory distress
⚠️ Dark or purple gum and lip color accompanied by mental confusion

02How can I assess the situation at home? Key observations and emergency indicators

Key things to observe and record at home before visiting the vet, to help the veterinarian assess and manage the condition quickly.

Record breathing rate, note any obvious labored breathing, and take a video
Film walking and standing (one clip each from the front and side)
Observe mental alertness and response speed — note the time any changes occur
Record changes in appetite and food intake, or whether your pet is refusing food
Track frequency, volume, and any abnormalities in urination and bowel movements
If you notice anything unusual, save photos or videos and visit a vet promptly

03How will the vet make a diagnosis? Common diagnostic tests

The vet will start with a physical examination, supported by blood tests and imaging to confirm the diagnosis and locate the thrombus.

Physical examination

palpation, cardiopulmonary auscultation, and neurological assessment

Blood tests

complete blood count, electrolytes, and biochemistry to evaluate organ function

Urinalysis

to rule out infection or assess kidney status

Blood glucose

to exclude hypoglycemia and other metabolic abnormalities

Imaging

CT or specialist imaging to evaluate the location of the thrombus

Cardiac ultrasound (echocardiography)

to assess heart structure and identify possible underlying cause

Seek a facility equipped for CT scanning and intensive care monitoring

04What treatment and care are needed after diagnosis? Medications, diet adjustments, and home care guide

Initial management focuses on supportive care and symptom control; regular blood and imaging follow-up is needed after discharge.

Fluid therapy and hemodynamic support to maintain circulation and electrolyte balance
Oxygen supplementation and close monitoring of vital signs as needed
Pain management and supportive medications as determined by the veterinarian
After discharge, monitor appetite, activity level, and body weight changes
Attend regular follow-up appointments to track blood test and imaging results
For complex cases, specialist clinic follow-up is recommended for long-term management

05What should I prepare before the vet visit? Key information to help the vet understand your pet's condition quickly

Detailed notes on when symptoms started and how frequently they occur

Records of food intake and appetite changes over the past few days

Log of urination and bowel movements — timing, frequency, and any changes in appearance or amount

A list of current medications or supplements your pet is taking

Videos or photos of abnormal walking or breathing

Call ahead to book an appointment and let the clinic know if there are any emergency signs

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.