Our cardiology doctors evaluate, diagnose and treat congenital and acquired heart diseases. This comprehensive practice offers specialized diagnostics and invasive procedures relevant to management of cardiovascular diseases in pets.

As a specialized practice within a multi-specialty hospital, we provide integrated specialized care for pets with complex, multi-systemic disease and assist in the management of cardiac complications of other disease processes. When necessary, we make recommendations for and facilitate transfer to our surgeons when surgical intervention or therapy is required.

We work closely with your regular veterinarian to keep them updated on our findings and recommendations and partner with them to provide for your pet’s ongoing care. When choosing to follow up with your regular veterinarian, we will review and make recommendations to your regular veterinarian on follow up lab work and blood pressure results at no cost. However, We do not contact you directly to discuss test results done elsewhere. There is a fee associated with more extensive consultations. This fee varies with what diagnostics are being sent for review.

Check in form and quick links

Click here to download the editable check in form for the Cardiology department and email to [email protected]

Click here for common cardiology nutrition sites, resting respiratory rates and medication logs.

Getting Treatment

If your veterinarian has evaluated your pet and has recommended that your pet needs an appointment with one of our Board-Certified Specialists, we ask that your veterinarian complete our referral form.

Click Here to download our referral form.

Our Services


The echocardiogram is an ultrasound of the heart. Our highly sophisticated echocardiograph is the same equipment used in human hospitals such as Akron General and the Cleveland Clinic. With this machine, we obtain two dimensional views of the heart, including all four chambers of the heart, valves and major blood vessels. Using Doppler, we can also evaluate the speed, direction, and quality of blood flow. The picture from an echocardiogram is much more detailed information about the heart than a radiograph and involves no radiation exposure. The echocardiogram is non-invasive and does not require anesthesia, although a light sedative may be used, on rare occasion, for some of our uncooperative patients or in puppies and kittens.

Chest Radiographs

Radiographs are one of the most common diagnostics performed. Radiographs, or x-rays, of the chest are usually done to evaluate heart size and the lung fields. Congestive heart failure is diagnosed when the radiographs show evidence of fluid in the lungs in conjunction with cardiac changes. X-rays are a non-invasive test. The patient is placed on their side for one view and then on their back for the second view. The results are ready within seconds and available for interpretation by our team of cardiologists and our radiologists (IDEXX Teleradiology). We do not interpret or consult on radiographs taken on non-established patients.

Blood Pressure

Monitoring your pet’s blood pressure is often important in caring for him/her in the face of heart disease. This is another non-invasive procedure performed a little differently than in human medicine. We measure your pet’s front leg (tail and rear legs work as well) and based on that measurement choose the proper cuff size for the limb. Instead of using a stethoscope to listen for blood flow return after inflating and then slowly deflating the cuff, we use a Doppler device which amplifies the sound of the blood flow. With the Doppler we are able to measure the systolic (top number) blood pressure. Normal blood pressure in a dog is 100-160 mmHg, and in a cat is 110-160 mmHg.

Electrocardiogram (ECG/EKG)

An ECG is a recording of the electrical activity in your pet’s heart. It is used most commonly to diagnose an arrhythmia, or abnormal heart rhythm, in your pet. Changes on the ECG can also suggest enlargement of specific heart chambers. This is a non-invasive procedure where we have the capability to evaluate your pet’s heart rhythm by a rhythm strip (leads I, II, and III), 6-lead and 12-lead ECGs. We look at multiple leads to evaluate the electrical activity from different locations of your pet’s body. Our cardiologists do offer EGC consultations for non cardiology patients for a fee.

Holter Monitor

A Holter monitor is a special ECG recording device that your pet would wear home for heart rhythm monitoring purposes. Holter Monitors are worn for 24 hours, but in some cases can be worn for up to a week. A Holter is most commonly used to look for transient arrhythmias that may be missed on an in-clinic ECG, to evaluate frequency and severity of an arrhythmia, and to monitor response to anti-arrhythmic therapy.

Loop Recorder

A Loop Recorder is also a way to look for transient arrhythmia in a pet that is having collapse or other unexplained symptoms. This device is implanted superficially under the skin over the heart during a very brief anesthesia. This monitor has a battery life of up to three years and has a several minute period of heart rhythm in its memory that is consistently updated. When certain criteria are met, or when the Owner witnesses an event and triggers the device, that period of heart rhythm (about 7 minutes) around the trigger is stored for later retrieval. Once an animal has an event, we can download the information from the device non-invasively at a quick appointment. These monitors are used to investigate intermittent episodes of collapse when no other reason for the collapse can be identified with a thorough work-up.
Dr. Hitchcock in surgery

Cardiac catheterization and angiography

Because animals do not commonly suffer from coronary disease (unlike their human owners) and since most congenital and acquired diseases can be diagnosed non-invasively by echocardiography, cardiac catheterization and angiography are most often performed in association with invasive procedures or in cases which a definitive diagnosis cannot be made by echocardiography. Cardiac catheterizations are performed in anesthetized animals and most commonly involve passing specialized catheters via either the jugular vein or carotid artery in the neck or femoral artery or vein in the leg into the great vessels and heart. Pressures can be measured and special dye studies (angiography) can be done to outline cardiac structures.

Invasive Procedures

The most common cardiac invasive procedures performed at Metropolitan are pacemaker implantation, balloon valvuloplasty, and ductal occlusion of patient ductus arteriosus. Pacemakers are implanted for abnormal heart rhythms that cause the heart to beat too slowly or result in pauses in the heart beat. Balloon valvuloplasty is most commonly done for palliation of a birth defect of the pulmonic valve that prevents this valve from opening normally. A specialized balloon catheter is passed across the abnormal valve and inflated to tear open the valve and allow easier passage of blood into the lungs. The Amplatz Canine Ductal Occluder (ACDO) is a device that can be delivered via a catheter to occlude (correct) a patent ductus artriosus, a common birth defect in dogs. This defect can also be corrected by thoracic surgery in animals that are too small for the ACDO device.

Our Practice


For your initial appointment please allow yourself at least an hour and a half to two hours for the consultation and diagnostics. Please arrive 10 minutes before your scheduled appointment to complete check in. If you would like to fill check in forms prior to your appointment please see the link above. You may bring this paperwork with you, or email it to our office: [email protected].Once the paperwork is complete, a doctor or a technician will obtain a history on your pet. A preliminary plan, most likely including an echocardiogram, will be discussed and any questions you can have will be answered. A Cardiologist will examine your pet and review information from your referring veterinarian and formulate a definitive plan for your pet. This recommended plan will be discussed, if different from the preliminary plan, and any additional questions you may have will be answered. Upon completion of the recommended diagnostics you will be placed in an exam room, and the Cardiologist will go over her findings and additional recommendations. This can be done over the phone if you would prefer. During the consultation, the Cardiologist will provide you with a detailed estimate for any additional diagnostics she is recommending. We will have written go-home instructions (including test results, diagnosis, medications, and further follow-up needed) for you. The final report may not be available at the end of your appointment if all the test results are not available; though, a final copy will be sent to the email on file. A copy of these go-home instructions is always faxed to your referring/regular veterinarian(s) that were provided on the check in forms. Please call our receptionists at 330-670-2376 option 2 to schedule an appointment.

Frequently Asked Questions:

Click Here for a list of FAQ’s on Cardiology, medications, and when to seek Emergency Care

Cardiology Department Hours

Our Cardiology Department’s hours are Monday through Friday from 8:00am to 4:30pm. The Cardiologists do come in over the weekends to evaluate in-hospital patients and are available for emergency phone consultation to our Emergency Service around the clock.

Hospitalized Patients

When your pet is hospitalized through cardiology you will receive a call by noon with a general update (during regular business hours Monday through Friday). If you have not heard from us by noon please don’t hesitate to call. One of the Cardiologists will call in the afternoon with a second update once we have gathered information and have performed necessary diagnostics. The afternoon update calls are usually after 4:00pm (Monday through Friday). If your pet is hospitalized outside of regular business days you will receive a call from a doctor before noon. A receptionist will call you with a financial update once daily while your pet is hospitalized Monday through Friday. Please ask the Cardiologist for a financial update if your pet is hospitalized over the weekend. Visitation hours for our hospitalized patients are between the hours of 10:00am and 7:00pm. Room visitation for approximately 30 minutes once a day is allowed. We ask that ICU visitation be limited to 15 minutes. If you visit after hours, please do not expect to speak directly to the emergency veterinarians. If you have any concerns, please let the technical staff know and this will be relayed to the attending doctor or staff doctor.

Meet Our Doctors

Dr. Lori S. Hitchcock

Lori S. Hitchcock DVM, DACVIM (Cardiology)

Dr. Lori Hitchcock is originally from Maryland and graduated from the University of Maryland summa cum laude in 1992 with a B.S. in veterinary science. She completed her Doctor of Veterinary Medicine degree at Ohio State University, also graduating summa cum laude. She stayed at Ohio State for a small animal medicine internship then performed her residency in cardiology at the University of Missouri under the mentorship of Dr. John Bonagura. She was board certified by the American College of Veterinary Internal Medicine Specialty of Cardiology in 1999. Dr. Hitchcock remained at the University of Missouri as a clinical instructor for one year before returning to Columbus, Ohio, as a staff cardiologist at MedVet Medical Center, where she practiced for four years. In 2004, Dr. Hitchcock opened Ohio Veterinary Cardiology at the Metropolitan Veterinary Hospital in Akron, Ohio.

Dr. Hitchcock is an active member the American Veterinary Medical Association, and the American College of Veterinary Internal Medicine (ACVIM). She has served on several ACVIM committees and currently is Secretary for the ACVIM Specialty of Cardiology. She is grateful to work in a career that she truly loves and is inspired by.

Dr. Hitchcock lives in Medina with her husband.  She has four children, two grown, and two nearly so, and two dogs, a Cavalier King Charles spaniel, Olivia, and a Labrador Retriever, Lexi.

Dr. Michelle Villalba

Michelle Villalba, MS, DVM, DACVIM (Cardiology)

Dr. Villalba grew up in Cincinnati Ohio and joined Ohio Veterinary Cardiology in August 2019. Following graduation from veterinary school she completed a small animal rotating internship at Ontario Veterinary College. She returned to The Ohio State University to complete her residency in cardiology. During her residency program, she obtained her master’s degree studying diastolic function in cats with hypertrophic cardiomyopathy. She enjoys treating all cardiac conditions and giving her patients an improved quality of life. In her free time, she enjoys relaxing at home with her husband, dog and two cats.

Dr. Caitlin Stoner, DVM DACVIM

Caitlin Stoner, DVM, DACVIM (Cardiology)

Dr. Stoner grew up in western New York and joined Ohio Veterinary Cardiology in September 2022.  Following graduation from veterinary school at Cornell University, she completed her small animal rotating internship at The Ohio State University. After completing  her rotating internship, she spent three years as an emergency practitioner at CARE Center in Cincinnati Ohio. This was prior to pursuing an Emergency and Critical Care specialty internship at North Carolina State University and her cardiology residency at Texas A&M University. This is where she developed a strong interest in advanced imaging and interventional treatment of congenital and acquired heart disease. In her free time, she enjoys spending time with her husband and cat, hiking America’s National Parks and riding her two horses.

Dr. Mary Carter, DVM, Resident in Cardiology

Mary Carter, DVM, Resident in Cardiology

Dr. Carter grew up in Hudson, OH and obtained her undergraduate and DVM degrees from The Ohio State University. After graduation from veterinary school, she worked as an emergency veterinarian for three years (including one here at Metropolitan Veterinary Hospital) before completing a small animal rotating internship at The University of Wisconsin – Madison. She is thrilled to be back at Metropolitan for her cardiology residency. Dr. Carter is the owner of three badly behaved cats, and has a special interest in feline cardiomyopathy. In her spare time, you can find her enjoying time with her family, reading and spending as much time in the sun as she can.