Consultant Profile

Mr Theo Velissaris

Mr Theo Velissaris DM, AFRCSEd, FRCS (C/Th)
Practicing at:
Spire Southampton Hospital
  • Cardiothoracic surgery
    • Cardiac surgery
    • Congenital heart disease
    • Thoracic surgery
Special clinical interests:

Coronary artery bypass grafting

Aortic valve replacement

Mitral valve repair

Re-operative cardiac surgery

Surgery to the aortic root and ascending aorta

Assessment of high risk and elderly patients for surgery

Research interests:

MD thesis on pathophysiology of beating heart and conventional cardiac surgery

Outcomes of cardiac surgery in high risk patients

Current NHS and /or university posts:

Consultant Cardiac Surgeon, University Hospital of Southampton

Year of first medical qualification:
Current membership(s) of professional, national and regional bodies:

Royal College of Surgeons of Edinburgh

Society for Cardiothoracic Surgery in Great Britain & Ireland

Contact Details 
Private secretary:
Alex Snashall
Private secretary telephone number:
023 8091 4481
Private secretary fax:
023 8091 4481
Private secretary email address:
Background Information 
Professional profile:

Mr Velissaris has been a Consultant Cardiac Surgeon since 2009, when he was appointed at Manchester Royal Infirmary. He subsequently joined the cardiac surgical unit of the University Hospital of Southampton (UHS) in 2013. He has performed over 1000 cardiac operations as a Consultant undertaking all aspects of adult cardiac surgery. He has a special interest in assessing high risk and elderly patients and currently more than a quarter of his patients are over the age of 80.

Mr Velissaris’ personal operative results, and those of the Cardiac Unit at UHS, are available for public scrutiny at the Healthcare Commission website ( Since he joined UHS his personal operative outcomes, and those of the cardiac unit at UHS, have consistently been significantly better than expected when adjusted for surgical and operative risk. They compare very favourably with other Cardiac Units in the United Kingdom. 

Mr Velissaris was awarded an MD thesis by the University of Southampton in 2007 for his work on the pathophysiology of beating heart and conventional coronary artery bypass grafting. He has presented his research work at national and international meetings and was awarded several prizes, including the Ronald Edwards medal by the Society for Cardiothoracic Surgery in Great Britain and Ireland and he was a finalist for the Young investigator’s award by the European association for Cardiothoracic Surgery. He maintains an active interest in supervising clinical research, with over 30 peer-reviewed publications.

Mr Velissaris is very actively involved in teaching and training. He is a member of the question writing group for the Cardiothoracic Intercollegiate examination and he teaches senior Cardiothoracic registrars at a national course before their final examination. He is an educational supervisor for Cardiothoracic surgical trainees at UHS and he has active roles as an appraiser and as safety lead in Cardiothoracic Surgery.

Mr Velissaris studied medicine at the University of Patras in Greece and qualified in 1995. He undertook basic surgical training in Wales and Cardiothoracic surgical training initially at Royal Brompton Hospital and subsequently in Southampton. Following a period of research he was appointed as a Specialist Registrar in Cardiothoracic Surgery in 2002 and qualified in 2008.  

Personal profile:

I was born and educated in Greece and moved to the UK when I qualified as a doctor in 1995. I am married with a daughter and a son. In my spare time I enjoy taking my son to watch the Saints, playing the guitar and spending time with my family.

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