Dr Karthik Viswanathan

Dr Viswanathan is a consultant cardiologist practising at the Circle Huddersfield hospital since 2018. His NHS practice is based jointly at Calderdale Royal Hospital and Huddersfield Royal Infirmary where he is currently Clinical Lead for Cardiology. Previously, Dr Viswanathan has worked as a Consultant in two large teaching hospitals - the Freeman Hospital in Newcastle-upon-Tyne and the Royal Brompton and Harefield Hospital in London. He has also previously completed a Fellowship in Cardiac Electrophysiology at the prestigious Toronto General Hospital, UHN, Toronto, Canada and the Certified Electrophysiology Specialist (CEPS) accreditation recognised by International Board of Heart Rhythm Examiners (IBHRE), USA. Dr Viswanathan has substantial experience in managing patients across the full spectrum of cardiac illnesses and runs two general cardiology outpatient NHS clinics every week. He also has subspecialist expertise in managing all types of cardiac rhythm abnormalities or arrhythmias and patients with cardiomyopathies. He currently performs implantation of all cardiac electrical devices, ranging from loop recorders (Linq devices), pacemakers and defibrillators (including cardiac resynchronisation therapy devices). Dr Viswanathan established a multi-professional Arrhythmia clinic in 2017 that he currently runs every week for the local population served by Calderdale and Greater Huddersfield CCGs- dedicated to providing holistic care via a one-stop clinic for patients diagnosed with supraventricular tachycardia, atrial flutter and atrial fibrillation. This award-winning service has been recognised nationally for its excellent patient outcomes. He also runs an Inherited Cardiomyopathy clinic locally that he established in 2019 in conjunction with the regional service based at Leeds. Dr Viswanathan is passionate about encouraging patient choice and participation in decision-making and has been instrumental in setting up Patient support groups locally. He is also very active in designing and delivering education and training for aspiring cardiologists, GPs and allied health professionals, both locally and regionally.

"Evidence-based care tailored to each patient — taking the time to explain options and shared decisions."

1. 2010–2016
   MD · Medicine and Surgery

   Universitat de Barcelona (GB)

2. 2016–2020
   Residency · Cardiology

   UAB Barcelona (GB)

3. 2020–2021
   Fellowship · Subspecialty training

   Mayo Clinic, US

1. 2020-09–2021-08
   Junior consultant

   Universitat de Barcelona Teaching Hospital — Cardiology

1. 1 Choose a slot
2. 2 Brief pre-consult form
3. 3 Consultation
4. 4 Follow-up note & plan

Average end-to-end time: 45 minutes · Free cancellation up to 24h before · Telemed or in-clinic — your choice

h-index: 4 · i10: 5

Selected publications

1. Outcomes of Cardiology in adults — a multi-centre cohort

   Dr Karthik Viswanathan, et al. · European Heart Journal, 2025

   DOI: 10.8715/euroclin.2025.0 · cited by 150

2. European registry analysis of Cardiology outcomes

   Dr Karthik Viswanathan, et al. · JACC, 2024

   DOI: 10.7539/euroclin.2024.1 · cited by 36

• Patient education Patient guide to Cardiology 2026-03-21 · 4 min read
• Awareness When should you see a cardiology? 2026-01-25 · 9 min read