Clinical expertise

Dr Georgios Karagiannis has extensive experience in general and acute cardiology with a specialist interest in:


Dr Georgios Karagiannis is a consultant cardiologist at Harefield Hospital, where he treats private and NHS patients.

He studied medicine at the Aristotle University of Thessaloniki in Greece. He completed his specialist training in Greece and was awarded ‘excellent’ marks on completion. In 2009, he completed his PhD in Cardiology, for which he also received an ‘excellent’ mark.

For his academic and clinical work, Dr Karagiannis has been awarded a fellowship of the European Society of Cardiology and a fellowship of the European Heart Failure Association.

Since 2013, he has worked as a consultant cardiologist at the transplant department of Harefield Hospital.


Dr Georgios Karagiannis’s research is mainly focused on heart failure. He has been awarded three national prizes for his research.


Dr Georgios Karagiannis has a keen interest in teaching and has the following roles:

  • honorary senior clinical lecturer at Imperial College London
  • senior lecturer at Brunel University London
  • tutor at the Royal College of Physicians
  • educational lead for medicine at Hillingdon Hospital


Dr Georgios Karagiannis has developed a broad academic portfolio including publications in high-profile medical journals. He has presented his work in both national and international congresses.

He has published papers on a range of topics, including:

  • left ventricular geometry as a major determinant of left ventricular ejection fraction: physiological considerations and clinical implications
  • a simple score for early risk stratification in acute heart failure
  • in-hospital bleeding events in acute coronary syndrome patients undergoing percutaneous coronary intervention in the era of novel P2y12 inhibitors
  • prevalence of impaired coronary flow reserve and its association with left ventricular diastolic functions in asymptomatic individuals with major cardiovascular risk factors
  • the sympathetic nervous system in heart failure physiology, pathophysiology, and clinical implications