Dr Niall Keenan

Cardiologist in


Dr Niall Keenan areas of expertise:

Professional statement

Dr Niall Keenan is a leading and widely revered consultant cardiologist practising in both Bushey and London. With over 20 years of experience in a full range of cardiological issues, Dr Keenan’s specialities are in heart failure, valvular heart disease, and cardiac imaging, such as echocardiography, cardiac CT, and cardiac MRI.  

Following his graduation from Oxford University in 2001, Dr Keenan undertook extensive training in cardiology, carrying out cardiac MRI training and research, cardiac CT training, and heart failure training in esteemed hospitals across London. He completed training in echocardiography in both London and Paris. He is accredited in CMR (cardiovascular magnetic resonance imaging), cardiac CT, cardiovascular imaging, transthoracic echocardiogram (TTE), and trans-oesophageal echocardiogram (TOE or echo). 

Since 2014, Dr Keenan has held the position of consultant cardiologist at West Herts NHS Trust, where he is also the clinical director for interventional medicine. He has also previously held the position of training lead for cardiology at West Herts NHS Trust. Additionally, he is an honorary consultant cardiologist at Hammersmith Hospital. Dr Keenan advocates a holistic and caring approach in the treatment of his patients, focusing on their individual concerns and needs. He ensures his patients have the opportunity to be a part of the decision-making process.  

Outside of his clinical work, Dr Keenan actively pursues an interest in research, mainly focusing on cardiac MRI. He is an honorary clinical senior lecturer at the Institute of Clinical Sciences, Imperial College London. His research has been published in numerous journals; a full list can be found here. He has also reviewed for international journals such as the Journal of Cardiovascular Magnetic Resonance (JCMR) and the Journal of Magnetic Resonance Imaging (JMRI).  

In 2018, he was elected to the board of the British Society for CMR. He was the lead in conducting a nationwide survey on CMR units and was the lead author of the national standard document on CRM to standardise and reduce the variation in CMR across the UK. In 2020, he was invited to join the Scientific Documents (Guidelines) Committee of the European Association of Cardiovascular Imaging (EACVI). In 2022, Dr Keenan was elected treasurer of the British Society of Cardiovascular Magnetic Resonance (BSCMR).

Diseases, Medical Tests and Treatments

Other information about Niall Keenan

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