Case 1

This 68 year old man had 10 seconds of central chest tightness radiating into the base of his neck, associated with sweating. This occurred immediately after his wife tripped at home and dislocated her shoulder. He accompanied his wife to the Emergency Department and then decided he wanted a medical assessment. He had a past history of possible myocardial infarction at the age of 35 years, and also had a history of paroxysmal atrial fibrillation. His only medication was sotalol.

Examination was normal apart from the presence of a marked pectus excavatum.

The following investigations were done:

What is / are the rhythm(s) in this ECG?