Let’s start this new feature with the challenge of a slightly tricky arrhythmia. See if you can describe fully what’s happening here. Warning: it’s very unlikely that a simple 3 or 4 word description will suffice! Tell us what you think it is in the comments section below.

Dr Dave Richley, Associate Lecturer, Newcastle University

Congratulations to James Bongart – Trainee Cardiac Physiologist at Nottingham University Hospitals NHS Trust. The previous month’s ECG was Sinus Rhythm with 1st degree AV block, the PR interval being very long indeed (480ms).