• John Barker is 56 years old.
• He had a myocardial infarction seven years ago and made an excellent recovery following angioplasty. Prior to that he smoked but after the heart attack he gave up and tried to improve his lifestyle through healthy eating and regular exercise.
• Over the past few weeks he has noticed worsening breathlessness. His exercise tolerance has reduced and he can no longer complete his round of golf without needing to stop and rest frequently.