Small Animal Services: Canine Dilated Cardiomyopath
Canine Dilated Cardiomyopathy
What is Canine Dilated Cardiomyopathy?
- Canine Dilated Cardiomyopathy (DCM) is a primary heart muscle disease that affects large breed
- DCM can have genetic, metabolic, nutritional, or infectious causes, but often the cause can’t be
- DCM causes the heart muscle to weaken (loss of contractility), and the heart chambers to enlarge (dilate).
- Irregular heartbeats (arrhythmias) often complicate DCM, and can sometimes cause of
- DCM is usually a progressive disease. Clinical signs occur when the heart can no longer pump enough blood to meet the body’s needs for oxygen and nutrients (heart failure). Arrhythmias can cause clinical signs as well (episodes of weakness or fainting), and they cause some patients to die
- DCM is inherited in some breeds (e.g. Doberman Pinschers, Boxers, Irish Wolfhounds, Great Danes).
How is DCM diagnosed?
- DCM may be diagnosed by screening tests in at risk breeds, allowing earlier treatment.
- Common screening tests include echocardiography, Holter (24 hour ECG) monitoring, and serum biomarkers such as NT-proBNP and
- Unfortunately, DCM is often first diagnosed signs of congestive heart failure are
- Genetic testing for traits that predispose to DCM is available for Boxers and Doberman Pinchers at NC State Cardiology Genetics lab. For more information, visit ncstatevets.org/genetics.
What is the treatment for DCM?
- Medications (pimobendan, ACE inhibitors, other medications) delay the onset of heart failure in dogs identified by screening prior to the onset of clinical signs of heart failure.
- The treatment congestive heart failure (CHF) typically includes these medications in addition to diuretics.
- Specific antiarrhythmic drugs may also be
In addition to drug therapy, nutritional and metabolic supplements may be helpful
How can I tell how my dog is doing at home?
- The goal is for your dog to behave normally at
- Monitoring breathing rate when your dog is asleep will help detect the onset or recurrence of
- Normal respirations are less than 36 breaths per minute, but a 20% increase over 2 days is
- A smartphone app called Cardalis simplifies obtaining and tracking the breathing rate from a
- Other signs can include decreased activity or appetite, coughing, weakness, fainting or belly
What is the prognosis with DCM?
- Dogs identified by screening tests before the onset of clinical signs may do well for
- The average time to development of heart failure or sudden cardiac death is variable (1-4 years).
- Dogs with clinical signs of heart failure often survive 6 – 24 months with medications and excellent care.
The NC State Cardiology Service supports numerous research projects aimed at building on what is already known about heart failure and at uncovering new knowledge about its causes, diagnosis and treatment…
Veterinary Cardiac Genetics
Are you interested in learning more about cardiomyopathies, (diseases of the heart muscle)? DNA testing is available for the following breeds: Feline HCM (Maine Coon, Ragdolls), or Canine cardiomyopathies (Boxer, Doberman.)
The NC State Cardiology service now offers a Holter (24 hour ambulatory ECG) program.
Go to the Cardiology Clinical Studies page for information on current clinical studies. Details include the study’s purpose, benefits for participating, and financial incentive information.
Hypertrophic Cardiomyopathy in Cats
Hypertrophic Cardiomyopathy (HCM) is the most prevalent feline cardiac disease. It is a primary disorder of the heart muscle characterized by thickening of the left ventricle. Learn more here…
Frequently Asked Questions & Resources
We operate primarily on a referral basis, with the patient’s primary veterinarian referring them to the NC State Cardiology Service by calling us to discuss the patient’s condition.
Referral is not required for second opinions, breed-related certifications for congenital heart disease, or treatment of heartworm infection. By speaking with the primary veterinarian prior to the appointment, we are often better able to determine the severity of the problem, which of our services the patient is likely to need, how soon the patient needs to be seen, and whether any of the other specialty services at the VH should be consulted. We will also discuss our policies and fees at the time the referral is made, and formulate a plan for communicating our findings to the primary veterinarian.
After the referral has been made, owners may call us to make the appointment. We will collect owner and patient demographic information, provide an estimate of charges, discuss some of the diagnostic procedures that may be required, and answer any questions the owner may have regarding the visit. In order to have the best chance of getting a complete diagnostic work-up done in one day, we try to schedule new patients in the morning between 9:00-10:30 every day except Thursday which is reserved for interventional cardiac catheterization or other semi-elective surgical procedures.
The average total cost for some uncomplicated common interventional procedures that we perform routinely are as follows:
- Pacemaker implantation (includes EMG workup): $2800-3000
- Balloon valvuloplasty (includes workup): $2800-3000
- Patent Ductus Arteriosus occlusion (includes workup): $2500-2800
- Heartworm Retrieval (canine/feline): $2200-2500
Information Needed for Initial Evaluation
- Brief description of the reason for the appointment with the Cardiology service, including all of the patient’s symptoms even those that may not seem significant.
- List of medications patient is receiving, including any over the counter drugs, herbs or metabolic supplements, as well as any problems the patient may be having with the medications.
When am I going to see a doctor?
Please note that our Interns and Residents (aka House Officers), are fully licensed doctors with the same education and credentials as a general practitioner. There will ALWAYS be a doctor in charge of and supervising all aspects of patient care at the VH. In many cases multiple specialists may consult on a patient should their expertise be required. Typically, a fourth-year student will first collect a detailed history and present this information to the doctor in charge. You will then have an opportunity to discuss things in detail with the doctor and together you and he/she will formulate a diagnostic and treatment plan.
My doctor introduced him/herself as an Intern or a Resident – what does that mean?
It is important to understand that every intern or resident at the VH is a fully licensed doctor with the same education and credentials as a general practitioner. Interns and residents have chosen to pursue additional, in-depth postgraduate clinical training and were selected by us in a highly competitive international application process. We think you are in great hands!
Examination: Generally, a 4th-year veterinary student will escort the client and patient into an exam room to take a complete history while they perform a physical examination on the patient. This will take approximately thirty minutes.
Review: The student will then leave the room for about fifteen minutes to consult with one of our faculty cardiologists. At this time, the student and the cardiologist will also review any diagnostic material that the referring veterinarian has sent. The cardiologist will then introduce him or herself to the client and examine the patient. New patients usually need to be left with us for the day to allow enough time to complete the diagnostic tests needed to evaluate the heart and cardiovascular system.
Diagnostic tests for patients suspected of having heart disease often include electrocardiography, echocardiography, radiography, and various blood tests. Patients may need to be lightly sedated to complete the evaluation, since several of these tests require the patient to be absolutely still for several minutes at a time.
Discharge: At the time of discharge from the hospital (usually between 4PM-6PM), the cardiologist will discuss the patient’s condition with the owner and answer any questions. We will also send home detailed written information about the physical findings, diagnostic test results, diagnoses, medications, and recommendations for ongoing care. A copy of these instructions will be faxed to the referring veterinarian.
While a patient is hospitalized, the cardiologist and student on the case will arrange mutually convenient times every day for the owner to call (or be available to be called) to get an update on the patient’s condition, and answer any questions that may arise. We will also arrange mutually convenient times for the owner to visit the patient, if desired.
You are a State facility, so why are your fees so high?
The VH is a not-for-profit health care center and receives less than 2% of operating costs from the the State of North Carolina. The majority of our operating costs are paid by client fees and donations. In fact, many of the state-of-the-art diagnostic and treatment options we offer are only possible because of generous gifts from our clients. Our fees are set to cover the balance of our operating costs, and we are always looking for ways to provide better service at lower cost. Total costs are comparable to those of veterinarian specialists in private practice.
If you do not have a primary veterinarian you can search for one here: North Carolina Veterinary Medical Association
Additional resources may also be found at the NC State College of Veterinary Medicine’s website.