Dr Varnava undertook her medical training at Oxford University and St Bartholomew’s Hospital where she attained triple Honours. She went on to train in cardiology at The Royal Brompton Hospital & St George's Hospital. She is now a consultant cardiologist at the Hammersmith Hospital, Imperial College.
She is highly experienced in sports cardiology and on the FA advisory panel and cardiologist to many premiership football teams. She has an international reputation in the inherited cardiac conditions (cardiomyopathies, channelopathies and sudden cardiac death), and leads the Inherited Cardiac Conditions service at Imperial College Healthcare Trust.
Dr Varnava's other areas of specialisation are heart disease in women and through pregnancy. She has an active research interest in sports cardiology, hypertrophic cardiomyopathy and Brugada syndrome.
She regularly lectures at international meetings and has published widely in leading medical journals.