Dr Iain Sim

Dr Iain Sim is a Consultant Cardiologist and Cardiac Electrophysiologist at Frimley Health NHS Trust. He specialises in the diagnosis and treatment of heart rhythm disorders (arrhythmias) and has NHS practices across Frimley Park, Wexham Park and Harefield Hospitals.

He manages a full range of cardiac conditions including chest pain, breathlessness, palpitations, fainting (syncope), coronary artery disease and heart failure — with a specialist focus on arrhythmia and cardiac devices.

His clinical expertise spans catheter ablation for atrial fibrillation (including pulsed field ablation), atrial flutter, supraventricular tachycardia (SVT), ectopic beats, and ventricular tachycardia, alongside complex cardiac device implantation, including pacemakers, defibrillators (ICDs), and conduction system pacing. His further interests include inherited cardiac conditions and identifying and protecting patients at risk of dangerous heart rhythms.