What is hypertrophic obstructive cardiomyopathy (HOCM)?

Cardiomyopathy 00:15 min watch Published 5 March 2026 Dr Ravi Assomull, Consultant Cardiologist

Obstructive hypertrophic cardiomyopathy occurs when thickened heart muscle blocks the flow of blood leaving the heart. Dr Ravi Assomull explains how this affects circulation and why it can cause symptoms such as breathlessness or chest discomfort.

Learn more about Cardiomyopathy or book a consultation with Dr Assomull – no GP referral needed, appointments typically within one working day.

Transcript

In about 30% of patients with hypertrophic cardiomyopathy, there is a problem where blood is obstructed from leaving the heart due to the excessively thickened heart muscle.

← Browse all 233 video FAQs

What our patients think

 

Dr Assomull holds Doctify’s 2025 Outstanding Patient Experience award – explore our reviews and testimonials.