New Bolton Center Kennett Square, PA
Emergencies & Appointments:
Ryan Hospital Philadelphia, PA


The Cardiology Service at Penn Vet's Ryan Veterinary Hospital is considered the birthplace of specialty veterinary medicine. Today, the Service continues this tradition by offering state-of-the-art treatment and diagnostic services such as echocardiography, electrocardiography, radiography, angiography, and 24-hour ambulatory ECG (Holter) monitoring.

The Service also offers the latest minimally-invasive surgical and interventional therapies, including correction of congenital heart defects and artificial pacemaker implantation, heartworm retrieval, and radiofrequency ablation of select arrhythmias in dogs. We contribute to a variety of clinical trials that allow access to new therapies and diagnostics, many of which are not available anywhere else. You can find general information about clinical trials on our Clinical Sciences Research Division site and on Penn Vet's complete list of active clinical trials

The Cardiology Service sees appointments Monday-Friday.

Please Note: We cannot provide medical advice over the phone for pets that have not been seen by Cardiology.

Cardiology Appointments

Penn Vet Appointment Desk: 215-746-8387
Please request a cardiology appointment.

Ryan Veterinary Hospital
3800 Spruce Street
Philadelphia, PA 19104

Questions about your visit to Cardiology?
Call 215-898-3331 or email:

What Our Service Includes

Cardiology services include consultations on in-hospital patients, and appointments on an outpatient basis. In addition to blood work and other supportive tests we are able to perform a number of non-invasive and invasive procedures:

  • Non-invasive Procedures
    • Blood pressure measurement (indirect)
    • Echocardiography (incl. Doppler & Tissue Doppler)
    • Electrocardiography (12 lead ECG)
    • Event monitoring
    • Holter-monitoring (24-48 hours continuous ECG)
    • Pacemaker interrogation
    • Thoracic radiography (w/ Section of Radiology)
  • Appointment on an Out-patient Basis

    For most cases, cardiology appointments typically take one to three hours, and in some situations, specific arrangements can be made with the individual cardiologist for admission as day-cases, with drop-off in the morning and discharge later in the day. However, the appointment length will depend on the amount of diagnostic work-ups required.

  • Invasive Procedures

    Patients are typically admitted to the hospital early on the day of the procedure or the prior evening and discharged the following day (if no complications). An exception is pericardiocentesis or thoracocentesis, which are usually performed on an out-patient basis.

Our Care Team

Alexandra Crooks, VMD, DACVIM (Cardiology)
Assistant Professor, Cardiology
Interim Section Chief, Cardiology

Anna R. Gelzer,, PhD, DECVIM, DACVIM (Cardiology)
Professor, Cardiology
Section Chief, Cardiology

Marc S. Kraus, DVM, DECVIM, DACVIM, DACVIM (Cardiology, Internal Medicine)
Professor, Clinical Cardiology
Penn Affiliate Medical Director

Mark A. Oyama, DVM, DACVIM (Cardiology)
Charlotte Newton Sheppard Professor of Medicine
Professor of Cardiology

Cardiomyopathy in Cats Registry (CCR)

The purpose of the Cardiomyopathy in Cats Registry (CCR) is to find predictors of disease progression and symptoms in cats with disease of the heart muscle (cardiomyopathy) so that veterinarians can provide the best recommendations and treatments.


Getting Prepared for Your Visit

Read about what to expect from your visit.

Referring veterinarian?

If you are referring a patient to Ryan Hospital, please...