ECG of the Week - 15th February 2016

The following ECG is from an 86 yr old female who presented following an episode of chest pain. She has a dual chamber PPM in situ following a prior episode of complete heart block. Old ECG's revealed an A-paced rhythm with no lateral / high lateral T wave inversion.

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Things to think about

• What are the key ECG features ?
• What are the differentials for these features ?