A study involved patients with several severely narrowed coronary arteries. The patients were randomly allocated to one of two treatment plans and followed for four years.
| Treatment plan | Number of patients | Number who had a heart attack | Number who had a serious complication caused by treatment |
|---|---|---|---|
| bypass surgery, medication and lifestyle support | 600 | 42 | 18 |
| medication and lifestyle support only | 600 | 72 | 3 |
Evaluate the case for routinely adding coronary bypass surgery to medication and lifestyle support for these patients. Use evidence from the study.
102 exam-style questions on Edexcel GCSE Biology 5.4 Non-communicable diseases, covering 5.4.1 Interaction of factors in non-communicable disease, 5.4.2 Lifestyle factors and non-communicable disease, and 5.4.3 Treatments for cardiovascular disease. Each one has a worked solution and a mark scheme showing where the marks go.