From: Systematic reviews of adverse effects: framework for a structured approach
The margin between benefit and harm is narrow | Examples: |
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Treatment is of modest or uncertain benefit, with some possibility of harm | • Aspirin for prevention of cardiovascular events in a healthy patient. What is the increased risk of haemorrhage from aspirin? |
Treatment potentially very beneficial, but there are major safety concerns | • Carotid artery surgery in elderly patients with ischaemic heart disease who have suffered a stroke. The operation can prevent a future stroke but some patients may die from the intervention. |
Treatment potentially beneficial in long-term, or to community. No immediate direct benefit to individual but possibility of harm exists. | • Improving uptake of a childhood vaccine to promote population immunity, while trying to assuage individual parents' fears about early serious vaccine- induced neurological damage to their child. |
Several effective treatments have differing safety profiles – which should be preferred? | Examples: |
Treatments are similarly effective, but have different safety profiles | • A new insulin injection device is thought to cause less pain than the existing device |
The balance of benefits and harms differ substantially, e.g. the most effective intervention may have serious adverse effects, while the less effective one is potentially safer | • Radical mastectomy for breast cancer as opposed to limited, breast-conserving surgery which is less disfiguring but may carry a greater risk of local cancer recurrence. |
Adverse effects with an important role in deterring a patient from continuing an effective treatment | Examples: |
Treatment offers important benefit but adverse effects threaten patient's adherence | • The options for a patient with severe heart failure who has responded well to an ACE inhibitor, but has persistent cough: stop the medication altogether, try a lower dose, or change to an angiotensin receptor blocker? |