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Dr. Krishna Subramony Iyer


Pediatric Cardiac Surgeon


30+ Years of Experience


New Delhi

About Doctor

Dr. Krishna S. Iyer is renowned as one of India's most seasoned pediatric cardiac surgeons. He is the Executive Director of Paediatric Cardiac Surgery and is known for his clinical understanding and engagement in providing cardiac treatment for children in India and other developing countries.

He joined the faculty of the heart surgery department at AIIMS, New Delhi, after completing his medical studies. He then completed his pediatric cardiac surgery training in Australia before founding neonatal cardiac surgery at AIIMS.

At EHIRC (now FEHI), Dr. Iyer launched the first focused program for pediatric cardiac care in North India in 1995. This pediatric cardiac initiative, which he oversaw, has elevated the standard of pediatric cardiac treatment across India and its South East Asian neighbors.

More than 14,000 congenital heart disease patients from across India and more than 15 other countries have had surgery, thanks to Dr. Iyer. He was the first surgeon in India to complete a quick two-stage arterial switch and double-switch procedure.

He frequently travels to places across India and internationally to give talks and has more than a hundred research articles in national and international journals.

He served as the founding president of three organizations: the Society of Pediatric and Congenital Heart Surgeons, the Asia-Pacific Pediatric Cardiac Society, and the Pediatric Cardiac Society of India. 

Medical Qualifications

  • MBBS from All India Institute of Medical Sciences, New Delhi, 1978
  • MS in General Surgery from All India Institute of Medical Sciences, New Delhi, 1981
  • MCh in Cardio Thoracic Surgery from All India Institute of Medical Sciences, New Delhi, 1984 

Clinical Expertise

Special Interest

  • Arterial switch procedure 
  • Double switch operation 
  • TAPVC repairs 
  • Fontan and Fontan-type procedures 
  • Corrections for tetralogy of Fallot 
  • DORV, Truncus, etc. 
  • Senning operation 
  • Conduit repairs and a wide range of one-stage and multi-stage corrections for complex congenital heart diseases. 

All Treatments

  • Cardiac OPD Procedures
  • ECG-Treadmill Test TMT
  • 24-Hour Holter Monitoring
  • Ambulatory BP Monitoring (ABPM)
  • Echocardiography with Color Doppler
  • Transesophageal Echocardiography - TEE
  • Stress Echocardiography
  • Myocardial Perfusion Imaging (MPI) Test
  • Thallium Test - Nuclear Stress Test
  • 64 Slice CT Angiography
  • PET Scan
  • Off-pump beating CABG LV restoration
  • Valve Repair Replacement
  • Atrial Fibrillation Surgery
  • Ross Procedure
  • Cardiac Tumour Treatment
  • Thoracic Aortic Aneurysm Treatment
  • Aortic Dissection Repair Surgery
  • Minimal access surgeries for valves
  • ASD (Atrial Septal Defect) Closure
  • Aortofemoral Bypass Surgery
  • PTE - Pulmonary Thromboendarterectomy
  • Neonatal and Infant cardiac surgeries
  • Closure of defects like ASD VSD
  • Complex congenital heart surgeries
  • TAPVC - Total Anomalous Pulmonary Venous Connection Repair Arterial Switch
  • Single Ventricle Defects Surgery
  • ECMO Support
  • Cardiac Catheterization for congenital heart disease
  • Device Closure- ASD VSD
  • Balloon septostomy
  • Balloon Valvuloplasty - Aortic
  • Pulmonary and Mitral
  • Closure of Fistulas
  • Fetal Echocardiogram
  • Coronary Angiogram
  • Renal Angiogram
  • Cerebral Angiogram
  • Peripheral Angiogram
  • PTCA-Percutaneous Transluminal
  • Coronary Angioplasty
  • Peripheral Angioplasty
  • Aortic Stent Grafting
  • EPS-Electrophysiological
  • Radiofrequency Ablation
  • PPI-Permanent Pacemaker Implant - Single Chamber
  • IVC Filter Insertion
  • Biventricular Pacing
  • AICD
  • Trigger Point Injection (TPI)
  • PTMC - Percutaneous Transvenous Mitral Commissurotomy
  • Heart Bypass Surgery (CABG)
  • Angiography
  • Aortic Valve Replacement
  • Mitral Valve Replacement
  • VSD Closure (Adult) Surgery
  • Heart Double Valve Replacement
  • PPI-Permanent Pacemaker Implant - Double Chamber
  • CRT- D Implant (Cardiac Resynchronization Therapy)
  • PDA Device Closure
  • Single Bypass and Valve Replacement
  • Pediatric interventional cardiology

Professional Work Experience

  • He was an Assistant Professor at the All India Institute of Medical Sciences.

Career Highlights

  • One of India's top pediatric cardiac surgeons, Dr. Krishna Subramony Iyer focuses on congenital heart conditions.
  • Over more than 30 years of practice, he has conducted over 10,000 operations using various techniques, including arterial switch, DORV, Fontan and Fontan, double switch operation, and TAPVC repairs.
  • Dr. Iyer established the first pediatric cardiac care program in North India in 1995 and has a long history of affiliation with Escorts Heart Institute.
  • His main focus is the treatment of congenital cardiac abnormalities, and he conducted the first effective double-switch and quick two-stage arterial switches in India.
  • Neonatal and infant cardiac surgeries are only performed by a very small number of pediatric cardiac surgeons nationwide, including Dr. K S Iyer. He specializes in difficult newborn heart operations as well as pediatric malnutrition procedures.
  • He has been involved with charities and organizations that aid disadvantaged children and actively supports those who offer pediatric cardiac treatment. To make pediatric heart surgery accessible and within the means of the more underprivileged areas, he has been working with the principal.

Research and Fellowships

  • Senior Fellow of Pediatric Cardiac Surgery from the Royal Children’s Hospital, Melbourne, in 1989
  • Fellow of the Indian Association of Cardiovascular Thoracic Surgeons 

Awards and Recoginition

  • "Dynamic Indian of the Millennium" - KG Foundation - 2009
  • Pfizer Postgraduate Medical award - 1979
  • Hira Lal Gold Medal for being the best postgraduate in General Surgery - 1981 

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