Gap finder

Search review questions

Each row is one question a systematic review asked: who, what, compared with what, and which outcome, with the effect it found and how certain that is. Words match anywhere in the field.

Limit to evidence status or GRADE (optional)

1,248 questions in 108 reviews · Stroke

current versions
No studies 275 · 22%Ungraded 56 · 4.5%Very low 269 · 21.6%Low 349 · 28%Moderate 216 · 17.3%High 83 · 6.7%

Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.

QuestionEffectEvidenceStatus / GRADE
Endovascular therapy plus conventional medical treatment vs conventional medical treatment alone
Dependency · people with symptomatic intracranial artery stenosis
Endovascular therapy versus medical treatment for symptomatic intracranial artery stenosis (2023) · Cochrane
RR 1.51 [0.93, 2.45]4 studies · 947 participantsModerate
Endovascular therapy plus conventional medical treatment vs conventional medical treatment alone
Restenosis (≥ 50%) · people with symptomatic intracranial artery stenosis
Endovascular therapy versus medical treatment for symptomatic intracranial artery stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Endovascular therapy plus conventional medical treatment vs conventional medical treatment alone
Health‐related quality of life · people with symptomatic intracranial artery stenosis
Endovascular therapy versus medical treatment for symptomatic intracranial artery stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antiplatelet agent vs placebo
Outcomes (measurement) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antihypertensive agent vs placebo
Neurological impairment · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antihypertensive agent vs placebo
Ipsilateral major or disabling stroke (not reported) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.14 [0.02, 1.16]1 study · 793 participantsLow
Antihypertensive agent vs placebo
Stroke‐related mortality (not reported) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.57 [0.17, 1.94]1 study · 793 participantsLow
Antihypertensive agent vs placebo
Major bleeding · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antihypertensive agent vs placebo
Progression of carotid stenosis (DUS/at beginning and end) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.45 [0.23, 0.91]1 study · 129 participantsLow
Antihypertensive agent vs placebo
Adverse events · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antihypertensive agent vs placebo
Quality of life · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Anticoagulant agent vs placebo
Outcomes (measurement/time point) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Anticoagulant agent vs placebo
Neurological impairment · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Anticoagulant agent vs placebo
Ipsilateral major or disabling stroke · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antiplatelet agent vs placebo
Neurological impairment · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Anticoagulant agent vs placebo
Stroke‐related mortality · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Anticoagulant agent vs placebo
Major bleeding (hospital records/every 6 weeks) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 1.19 [0.97, 1.46]1 study · 919 participantsVery low
Anticoagulant agent vs placebo
Progression of carotid stenosis · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Anticoagulant agent vs placebo
Adverse events (hospital records/every 6 weeks) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.89 [0.81, 0.99]1 study · 919 participantsLow
Anticoagulant agent vs placebo
Quality of life · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Lipid‐lowering agent vs placebo or no treatment
Outcomes (measurement/time point) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Lipid‐lowering agent vs placebo or no treatment
Neurological impairment · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Lipid‐lowering agent vs placebo or no treatment
Ipsilateral major or disabling stroke (only reported for two studies: one used CT scan, MRI and hospital records/every 6 weeksb; the other used physical examination/at beginning and 10 days after the endc) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.36 [0.09, 1.53]5 studies · 2235 participantsLow
Lipid‐lowering agent vs placebo or no treatment
Stroke‐related mortality (only reported for one study: CT scan, MRI and hospital records/every 6 weeksb) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.25 [0.03, 2.29]2 studies · 1366 participantsLow
Lipid‐lowering agent vs placebo or no treatment
Major bleeding · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antiplatelet agent vs placebo
Ipsilateral major or disabling stroke (CT scan or MRI) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 1.08 [0.47, 2.47]1 study · 372 participantsLow
Lipid‐lowering agent vs placebo or no treatment
Progression of carotid stenosis · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Lipid‐lowering agent vs placebo or no treatment
Adverse events (only reported for two studies: one study used CT scan, MRI and hospital records/every 6 weeksb; the other used physical examination/at beginning and 10 days after the endc) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.76 [0.53, 1.1]7 studies · 3726 participantsLow
Lipid‐lowering agent vs placebo or no treatment
Quality of life · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antiplatelet agent vs placebo
Stroke‐related mortality (CT scan or MRI) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 1.4 [0.54, 3.59]1 study · 372 participantsLow
Antiplatelet agent vs placebo
Major bleeding (not reported) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.98 [0.06, 15.53]1 study · 372 participantsVery low
Antiplatelet agent vs placebo
Progression of carotid stenosis (DUS/every 6 months) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 1.16 [0.79, 1.71]1 study · 372 participantsLow
Antiplatelet agent vs placebo
Adverse events (not reported) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
RR 0.81 [0.41, 1.59]1 study · 372 participantsLow
Antiplatelet agent vs placebo
Quality of life · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Antihypertensive agent vs placebo
Outcomes (measurement/time point) · asymptomatic carotid stenosis
Pharmacological interventions for asymptomatic carotid stenosis (2023) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Activities of daily living (primary outcome) · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted5 studies · 283 participantsVery low
Intervention NR
Arm‐hand activity · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted3 studies · 112 participantsVery low
Intervention NR
Standing balance · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted22 studies · 917 participantsVery low
Intervention NR
Walking ability · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted19 studies · 535 participantsLow
Intervention NR
Quality of life after stroke · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted2 studies · 111 participantsVery low
Intervention NR
Death and serious adverse events, including falls · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted10 studies · 378 participantsLow
Intervention NR
Trunk function · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted14 studies · 466 participantsVery low
Intervention NR
Arm‐hand activity · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted1 study · 30 participantsVery low
Intervention NR
Standing balance · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted11 studies · 410 participantsVery low
Intervention NR
Walking ability · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted11 studies · 383 participantsVery low
Intervention NR
Quality of life after stroke · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted2 studies · 108 participantsVery low
Intervention NR
Death and serious adverse events, including falls · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted6 studies · 201 participantsVery low
Intervention NR
Activities of daily living (primary outcome) · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted9 studies · 229 participantsVery low
Intervention NR
Trunk function · participants after stroke
Trunk training following stroke (2023) · Cochrane
no estimate extracted36 studies · 1217 participantsVery low
Thrombo‐aspiration alone vs stent‐retrieval thrombectomy alone
Functional independence at 3 months (mRS 0 to 2) (primary outcome) · people with acute ischemic stroke
Different types of percutaneous endovascular interventions for acute ischemic stroke (2023) · Cochrane
RR 0.97 [0.82, 1.13]2 studies · 633 participantsHigh