What tests are needed if my cat's breathing becomes faster?

Common tests include physical auscultation, chest X-ray, echocardiography, and ECG, and may be combined with a blood biochemistry panel to rule out other contributing factors. Your vet will determine the appropriate sequence of tests.

Can endomyocardial disease affect a cat's lifespan?

The impact varies depending on the individual cat and the stage of disease. Mildly affected cats may remain stable for years, while those with severe disease or complications require close, ongoing monitoring. Discuss your cat's individual prognosis with your vet.

What information should I bring to my cat's appointment?

Bring a record of when symptoms started and how they have changed, recent weight and food intake logs, a list of current medications, and any available imaging or test reports — these help the vet make a faster, more accurate assessment.

What is the typical cost range for these tests?

Costs vary depending on the region and the tests required. The range from a basic work-up (X-ray and blood panel) through to echocardiography and specialist evaluation can differ significantly — contact your clinic for a detailed quote.

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

Feline Endomyocardial Disease in Cats: Symptoms, Diagnosis & Home Care [2025]

Feline endomyocardial disease is a group of conditions affecting the inner lining of the ventricles, including endocardial fibrosis. It leads to impaired cardiac function and requires long-term medical management to control symptoms.

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

•Continuous open-mouth breathing with significant respiratory effort
•Collapse, brief loss of consciousness, or sudden inability to stand
•Gums or lips turning noticeably purple or pale

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

•Noticeably depressed demeanor with reduced willingness to interact
•Significant decrease in activity level, less movement and play
•Ongoing weight loss or noticeably reduced appetite

01What symptoms indicate something is wrong?

Endomyocardial problems in cats often present as reduced energy or willingness to interact, and may involve changes in breathing and unexplained weight loss.

Lethargy, unwillingness to interact, or frequent hiding
Noticeably reduced activity — less walking or playing than usual
Gradual weight loss or significantly decreased appetite
Faster breathing, laboured breathing, or open-mouth breathing
Brief collapse or sudden loss of muscle strength

Seek emergency care immediately if you notice the following symptoms:

⚠️ Persistent open-mouth breathing with obvious respiratory effort
⚠️ Collapse, brief loss of consciousness, or sudden inability to stand
⚠️ Gums or lips turning noticeably purple or pale

02How to assess at home? Key observations and when to seek emergency care

Observing and recording changes in breathing, weight, appetite, and activity at home helps the vet quickly assess the situation.

Note when changes in energy and willingness to interact began and track the trend
Weigh your cat morning and evening and record the trend over time
Observe and record resting respiratory rate and whether open-mouth breathing occurs
Record daily food intake, water consumption, and litter-box patterns
Take short videos of walking, activity, or breathing to bring to the appointment
If symptoms worsen, arrange a clinic visit or go to an emergency vet as soon as possible

03How will the vet diagnose? Common diagnostic tests

The vet will start with a physical exam, then use imaging and blood tests for a full assessment, referring to a cardiologist or advanced imaging when needed.

Physical examination

auscultation of heart sounds, assessment of breathing and oedema

Chest X-ray

evaluate heart size and check for pleural effusion or pulmonary changes

Echocardiography

assess myocardial thickness, valve function, and chamber performance

Electrocardiogram (ECG)

evaluate heart rhythm and electrical conduction abnormalities

Blood and biochemistry panel

rule out metabolic or other organ disease

CT or advanced imaging arranged if needed for further evaluation

A hospital equipped with cardiac imaging is recommended for a complete work-up

04How to treat and care after diagnosis? Medications, diet adjustments, and home care guide

Treatment and follow-up typically involve medical management, dietary changes, and regular imaging, with emphasis on home monitoring and scheduled rechecks.

Begin symptomatic treatment as directed by your vet and schedule follow-up visits
Adjust diet as prescribed and continue monitoring weight management
Repeat echocardiography and necessary blood biochemistry tests on schedule
Continue monitoring breathing, activity level, and appetite at home and keep a log
Return to the clinic promptly or arrange specialist evaluation if symptoms worsen
Discuss a long-term care plan and prognosis assessment with your veterinary cardiologist

05What to prepare before the vet visit? Key information to help the vet assess quickly

Record when symptoms began, how they have changed, and how frequently they occur

List all current medications, supplements, and their dosages

Prepare a weight and food intake log covering the past week

Bring short videos of your cat's breathing and activity for the vet to review

Bring any prior test reports, X-rays, or echocardiogram images if available

Call ahead to ask whether any special preparation is needed before the appointment

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.