What We Do

  • Consultations
  • Electrocardiograms
  • Treadmill Testing
  • Nuclear Stress Testing
  • Echocardiography
  • T Wave Alternans Testing
  • Pacemaker Interrogation/Clinic
  • Ankle Brachial Indices
  • Holter and Cardiac Monitoring
  • Aortic and Carotid Ultrasound

Ultimate care and assistance to every patient

Specializing in
Comprehensive Cardiac Care since 1995

At Orange Cardiology our mission is to service our community with expert compassionate care through the awareness and treatment of cardiovascular disease. Our patients expect and deserve nothing less than excellence.


Viral Sheth, M.D., F.A.C.C.

Themistoklis Nissirios, M.D.

Lisa Thayer, MSM, ANP, BC

Visit our cardiac health information by click HERE

Visit our Patient Portal by clicking HERE

Meet Dr. Nissirios


Board-certified specialist in Internal Medicine, and Cardiovascular Disease. He has a subspecialty certification in Nuclear Cardiology. He is a graduate of University of Medicine and Dentistry of NJ/Robert Wood Johnson Medical School. He did his internship and residency at Montefiore Hospital, and his fellowship at Cooper Hospital University Medical Center, in New Jersey.





Lisa Thayer, MSN, ANP-C
Lisa is a Certified Adult Nurse Practitioner.
She is a graduate of Mount Saint Mary College.
She also holds a Bachelor of Science in Nursing.

NYS Adult Nurse
Practitioner Certification
NYS Professional
Registered Nurse
National Lipid
Association Certified