What is systolic anterior motion?

Systolic anterior motion means that certain heart structures move forward during heart contraction, which may affect blood flow and heart function. A vet needs to confirm the diagnosis with imaging such as echocardiography.

How should I observe and record symptoms at home?

Record changes in energy, activity level, and appetite, take videos of coughing and breathing, note how often coughing occurs and when it happens, and share this information with your vet at the appointment.

What main tests will be done at the clinic?

Common tests include a physical examination, chest X-rays, echocardiography, and blood biochemistry. Further imaging, such as CT, may be recommended if needed.

If it is not an emergency, how often will my pet need follow-up visits?

Follow-up timing depends on the severity of the condition. In general, your vet may recommend rechecks every few weeks to months, with repeat echocardiography or X-rays to assess changes.

How much do the tests and treatment usually cost?

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

Disease Guide

Systolic Anterior Motion in Dogs and Cats: Breathing Changes, Cardiac Imaging & Home Care [2025]

Abnormal heart movement during systole that can affect blood flow

Take 1 minute to check the symptoms first

Last updated: 2026/01/06

Pethealthmap Editorial Team

Sources: ACVIM, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Difficulty breathing, open-mouth breathing, or inability to breathe calmly
•Sudden collapse, inability to stand without assistance, or fainting
•Completely unresponsive to external stimuli or extremely lethargic

Schedule a veterinary visit as soon as possible (within 24-72 hours)

•Clearly decreased activity level but still able to move briefly
•Repeated coughing or a marked increase in coughing frequency
•Changed breathing rhythm or more frequent panting

01What symptoms may indicate a problem?

In dogs and cats, systolic anterior motion often causes changes in energy, activity level, and breathing. Signs can range from mild to severe, and imaging tests are needed to confirm the diagnosis.

Low energy and a clear drop in activity, with less interest in playing or going for walks
Appearing weak, having little strength when standing or walking, or tiring easily
Repeated coughing or more frequent coughing, especially after exercise or at night
Rapid breathing, changes in breathing pattern, or open-mouth breathing
Collapse, reduced response to stimulation, or prolonged sleepiness

Seek emergency care immediately if you notice the following symptoms:

⚠️ Difficulty breathing or obvious air hunger
⚠️ Sudden collapse, inability to stand, or inability to move
⚠️ Fainting, loss of consciousness, or a marked reduction in responsiveness

02How can you assess changes at home? Key observations and when it may be an emergency

Before visiting the clinic, structured observation and records can help your vet assess the condition and decide which tests should be prioritised.

Record when changes in mood and activity level started and how they are progressing
Use your phone to film coughing or abnormal breathing, including both resting and active periods
Count how often coughing occurs and note when it happens, such as morning, evening, or after exercise
Monitor and record any changes in appetite, water intake, urination, or stools
Seek veterinary care promptly if breathing worsens or your pet collapses

03How will the vet diagnose it? Common tests

At the clinic, your vet will mainly use clinical examination and imaging to assess heart structure and function while ruling out other systemic problems.

Physical examination

includes auscultation, palpation, and assessment of vital signs such as heart rate and respiratory rate

Chest X-rays

to assess heart size, pulmonary oedema, or other lung changes

Echocardiography (heart ultrasound)

to evaluate heart structure, valves, and blood flow dynamics

Blood tests and biochemistry

to check overall metabolism, infection, or other concurrent problems

Further imaging, such as CT, or specialist assessment may be recommended if needed to confirm the diagnosis

04How is it treated and managed after diagnosis? Medication, diet adjustments, and care

After treatment starts, regular monitoring of signs and imaging changes is needed. Medication and lifestyle management should be adjusted according to your vet's advice to reduce cardiac workload.

Follow your vet's instructions for medication, diet, and lifestyle management
Attend regular rechecks to monitor clinical signs and test results, with prescription adjustments if needed
Schedule echocardiography or chest X-rays as advised to monitor disease progression
Manage body weight and avoid excessive exercise to reduce strain on the heart
Long-term follow-up with a specialist service that can perform echocardiography is recommended

05What should you prepare before seeing the vet? Key information that helps clarify the cause

Write down when the symptoms began, how they have changed, and what steps you have already taken

Prepare videos, photos, and episode records of coughing or abnormal breathing

Bring daily notes on appetite, drinking, urination, and stools if available

List all medicines, wellness products, or supplements your pet is currently taking

Bring previous imaging results or medical reports, if available, for comparison

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.