Walrus Clinical Investigations Unit
Walrus Clinical Investigations Unit


The Cardiology department provides a complete spectrum of medical and surgical services to children with congenital and acquired heart disease.

We aim to provide care for children in a child-friendly environment with internationally established evidence-based standards.

The Inherited Cardiovascular Diseases centre at GOSH is the largest unit in Europe with 4,500 outpatient consultations and over 700 new referrals per year. GOSH has one of the largest centres for paediatric heart transplantation in the world. 

We are the only paediatric hospital in the UK to offer the full range of National Specialist Cardiac Services (including ECMO, bridge to transplant, heart transplant, tracheal services and pulmonary hypertension). 

The Cardiology service also includes: a catheter laboratory, an electrophysiology (EP) service, diagnostic EP, interventional EP. Our inherited cardiovascular disease service includes a hypertrophic cardiomyopathy (HOCM) service and Sudden Arrhythmia Service (SAS).

Watch a video on the cardio-respiratory service here. 


We perform the highest number of surgical episodes in the UK and Ireland. In the three years 2014 to 2017, there were 1885 cardiac operations performed in our unit, of which 99.2% of patients survived to 30 days. Based on the confidence limits selected by the National Congenital Heart Audit (NCHDA), our risk-adjusted survival rates for paediatric cardiac surgery are defined as ‘much higher than predicted’. 

  • We perform over 500 cases of cardio-pulmonary bypass and 150 cases off-bypass every year 
  • 99.2% of our cardiac surgery patients survive to 30 days with a 98% expected survival rate using PRAiS (Partial Risk Adjustment in Surgery) 

Conditions we treat

  • Coarctation of the aorta (aortic arch obstruction)
  • Aortic regurgitation
  • Aortic valve stenosis
  • Atrial septal defect (ASD)
  • Atrioventricular septal defect
  • Cardiomyopathy and myocarditis
  • Common arterial trunk (truncus arteriosus)
  • Functionally univentricular heart (includes tricuspid atresia, double inlet left ventricle)
  • Hypoplastic left heart syndrome
  • Interrupted aortic arch
  • Marfan syndrome
  • Mitral valve abnormality
  • Patent ductus arteriosus (PDA)
  • Primary pulmonary hypertension
  • Pulmonary atresia
  • Pulmonary stenosis
  • Severe heart failure in infants and children (mechanical circulatory support)
  • Severe respiratory failure in neonates and children (extracorporeal membrane oxygenation, ECMO)
  • Tetralogy of Fallot
  • Totally anomolous pulmonary venous connection
  • Tracheal stenosis
  • Tracheo/bronchomalacia
  • Transposition of the great arteries (TGA)
  • Tricuspid valve abnormalities, including Ebsteins
  • Ventricular septal defect (VSD)
  • Inherited heart conditions
  • Endocarditis
  • Heart murmur
  • Kawasaki syndrome
  • Rhythm disorders

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