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)

1,554 questions in 140 reviews · Heart

current versions
No studies 272 · 17.5%Ungraded 44 · 2.8%Very low 329 · 21.2%Low 464 · 29.9%Moderate 319 · 20.5%High 126 · 8.1%

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
Ultrafiltration (UF) vs usual care (UC)
All‐cause rehospitalisation · people with AHF
Ultrafiltration for acute heart failure (2022) · Cochrane
RR 0.76 [0.53, 1.09]3 studies · 337 participantsLow
Ultrafiltration (UF) vs usual care (UC)
Heart failure‐related rehospitalisation · people with AHF
Ultrafiltration for acute heart failure (2022) · Cochrane
RR 0.62 [0.37, 1.04]2 studies · 395 participantsLow
Ultrafiltration (UF) vs usual care (UC)
Need for mechanical invasive ventilation – up to and including 30 days · people with AHF
Ultrafiltration for acute heart failure (2022) · Cochrane
no estimate extracted0 studies · 0 participantsUngraded
Ultrafiltration (UF) vs usual care (UC)
% Change in serum creatinine – at 30 days from discharge · people with AHF
Ultrafiltration for acute heart failure (2022) · Cochrane
no estimate extracted1 study · 221 participantsLow
Ultrafiltration (UF) vs usual care (UC)
New initiation of renal replacement therapy – at longest available · people with AHF
Ultrafiltration for acute heart failure (2022) · Cochrane
RR 1.42 [0.42, 4.75]4 studies · 322 participantsLow
Ultrafiltration (UF) vs usual care (UC)
Complications of central line insertion – in hospital · people with AHF
Ultrafiltration for acute heart failure (2022) · Cochrane
RR 4.16 [1.3, 13.3]6 studies · 779 participantsVery low
Exercise‐based cardiac rehabilitation vs 'no exercise' control
All‐cause mortality · people with coronary heart disease
Exercise‐based cardiac rehabilitation for coronary heart disease (2021) · Cochrane
RR 0.87 [0.73, 1.04]25 studies · 8823 participantsModerate
Exercise‐based cardiac rehabilitation vs 'no exercise' control
Cardiovascular mortality · people with coronary heart disease
Exercise‐based cardiac rehabilitation for coronary heart disease (2021) · Cochrane
RR 0.88 [0.68, 1.14]15 studies · 5360 participantsModerate
Exercise‐based cardiac rehabilitation vs 'no exercise' control
Fatal and/or non‐fatal MI · people with coronary heart disease
Exercise‐based cardiac rehabilitation for coronary heart disease (2021) · Cochrane
RR 0.72 [0.55, 0.93]22 studies · 7423 participantsHigh
Exercise‐based cardiac rehabilitation vs 'no exercise' control
Revascularisation ‐ CABG · people with coronary heart disease
Exercise‐based cardiac rehabilitation for coronary heart disease (2021) · Cochrane
RR 0.99 [0.78, 1.27]20 studies · 4473 participantsHigh
Exercise‐based cardiac rehabilitation vs 'no exercise' control
Revascularisation ‐ PCI · people with coronary heart disease
Exercise‐based cardiac rehabilitation for coronary heart disease (2021) · Cochrane
RR 0.86 [0.63, 1.19]13 studies · 3465 participantsModerate
Exercise‐based cardiac rehabilitation vs 'no exercise' control
All‐cause hospital admissions · people with coronary heart disease
Exercise‐based cardiac rehabilitation for coronary heart disease (2021) · Cochrane
RR 0.58 [0.43, 0.77]14 studies · 2030 participantsModerate
Exercise‐based cardiac rehabilitation vs 'no exercise' control
Cardiovascular hospital admissions · people with coronary heart disease
Exercise‐based cardiac rehabilitation for coronary heart disease (2021) · Cochrane
RR 0.8 [0.41, 1.59]6 studies · 1087 participantsLow
Warfarin vs placebo or no treatment
All‐cause death · people with heart failure in sinus rhythm
Anticoagulation versus placebo for heart failure in sinus rhythm (2021) · Cochrane
OR 0.66 [0.36, 1.18]2 studies · 324 participantsLow
Warfarin vs placebo or no treatment
Stroke · people with heart failure in sinus rhythm
Anticoagulation versus placebo for heart failure in sinus rhythm (2021) · Cochrane
no estimate extractedNRNo studies
Warfarin vs placebo or no treatment
Major bleeding eventsc · people with heart failure in sinus rhythm
Anticoagulation versus placebo for heart failure in sinus rhythm (2021) · Cochrane
OR 5.98 [1.71, 20.93]2 studies · 324 participantsLow
Rivaroxaban vs placebo
All‐cause death · people with heart failure in sinus rhythm
Anticoagulation versus placebo for heart failure in sinus rhythm (2021) · Cochrane
OR 0.99 [0.87, 1.13]1 study · 5022 participantsHigh
Rivaroxaban vs placebo
Stroke · people with heart failure in sinus rhythm
Anticoagulation versus placebo for heart failure in sinus rhythm (2021) · Cochrane
OR 0.67 [0.47, 0.95]1 study · 5022 participantsModerate
Rivaroxaban vs placebo
Major bleeding eventsb · people with heart failure in sinus rhythm
Anticoagulation versus placebo for heart failure in sinus rhythm (2021) · Cochrane
OR 1.65 [1.17, 2.33]1 study · 5008 participantsModerate
Antibiotics vs placebo or no intervention
All‐cause mortality at maximum · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 1.06 [0.99, 1.13]20 studies · 25774 participantsHigh
Antibiotics vs placebo or no intervention
Quality of life at 24±6 months · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
no estimate extractedNRNo studies
Antibiotics vs placebo or no intervention
Cardiovascular mortality at 24±6 months · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 1.5 [1.17, 1.91]5 studies · 9044 participantsHigh
Antibiotics vs placebo or no intervention
Myocardial infarction at 24±6 months · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 0.95 [0.82, 1.11]5 studies · 9457 participantsModerate
Antibiotics vs placebo or no intervention
Stroke at 24±6 months · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 1.17 [0.9, 1.52]5 studies · 9457 participantsHigh
Antibiotics vs placebo or no intervention
Sudden cardiac death at 24±6 months · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 1.77 [1.28, 2.44]2 studies · 4520 participantsModerate
Antibiotics vs placebo or no intervention
Serious adverse event at maximum · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
no estimate extractedNRNo studies
Antibiotics vs placebo or no intervention
Quality of life at maximum · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
no estimate extractedNRNo studies
Antibiotics vs placebo or no intervention
Cardiovascular mortality at maximum · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 1.11 [0.98, 1.25]2 studies · 4674 participantsModerate
Antibiotics vs placebo or no intervention
Myocardial infarction at maximum · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 0.95 [0.88, 1.03]17 studies · 25523 participantsHigh
Antibiotics vs placebo or no intervention
Stroke at maximum · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 1.14 [1, 1.29]9 studies · 14774 participantsHigh
Antibiotics vs placebo or no intervention
Sudden cardiac death at maximum · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 1.08 [0.9, 1.31]2 studies · 4520 participantsModerate
Antibiotics vs placebo or no intervention
All‐cause mortality at 24±6 months · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
RR 1.25 [1.06, 1.48]6 studies · 9517 participantsHigh
Antibiotics vs placebo or no intervention
Serious adverse event at 24±6 months · patients with coronary heart disease
Antibiotics for secondary prevention of coronary heart disease (2021) · Cochrane
no estimate extractedNRNo studies
Summary of findings table ‐ Psychological treatment vs control
Depression symptoms ‐ short‐term · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extracted10 studies · 1226 participantsLow
Summary of findings table ‐ Psychological treatment 1 vs psychological treatment 2
Myocardial infarction ‐ short term (end of treatment) ‐ not reported · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extractedNRNo studies
Summary of findings table ‐ Pharmacological treatment vs placebo
Depression symptoms ‐ short term · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extracted8 studies · 750 participantsLow
Summary of findings table ‐ Pharmacological treatment vs placebo
Depression remission ‐ short term · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
OR 2.06 [1.47, 2.89]4 studies · 646 participantsModerate
Summary of findings table ‐ Pharmacological treatment vs placebo
All‐cause mortality ‐ short term · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
OR 0.38 [0.1, 1.47]2 studies · 437 participantsVery low
Summary of findings table ‐ Pharmacological treatment vs placebo
Cardiovascular mortality ‐ short term (end of treatment) ‐ not reported · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extractedNRNo studies
Summary of findings table ‐ Pharmacological treatment vs placebo
Myocardial infarction ‐ short term · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
OR 0.74 [0.26, 2.09]3 studies · 728 participantsVery low
Summary of findings table ‐ Pharmacological treatment 1 vs pharmacological treatment 2
Depression symptoms ‐ short term (end of treatment) · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extracted4 studies · 442 participantsUngraded
Summary of findings table ‐ Pharmacological treatment 1 vs pharmacological treatment 2
Depression remission ‐ short term (end of treatment) · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extracted3 studies · 243 participantsUngraded
Summary of findings table ‐ Pharmacological treatment 1 vs pharmacological treatment 2
All‐cause mortality ‐ short term (end of treatment) · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
OR 2.72 [0.51, 14.49]1 study · 149 participantsVery low
Summary of findings table ‐ Pharmacological treatment 1 vs pharmacological treatment 2
Cardiovascular mortality ‐ short term (end of treatment) ‐ not reported · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extractedNRNo studies
Summary of findings table ‐ Psychological treatment vs control
Depression remission ‐ short term · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
OR 2.02 [0.78, 5.19]3 studies · 862 participantsLow
Summary of findings table ‐ Pharmacological treatment 1 vs pharmacological treatment 2
Myocardial infarction ‐ short term (end of treatment) · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extracted3 studies · 396 participantsUngraded
Summary of findings table ‐ Psychological treatment vs control
All‐cause mortality ‐ short‐term · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
OR 0.31 [0.05, 2.02]2 studies · 324 participantsVery low
Summary of findings table ‐ Psychological treatment vs control
Cardiovascular mortality ‐ long‐term · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
OR 0.83 [0.62, 1.1]2 studies · 2720 participantsUngraded
Summary of findings table ‐ Psychological treatment vs control
Myocardial infarction ‐ short term (end of treatment) ‐ not reported · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extractedNRNo studies
Summary of findings table ‐ Psychological treatment 1 vs psychological treatment 2
Depression symptoms ‐ short term (end of treatment) · health problem or population
Psychological and pharmacological interventions for depression in patients with coronary artery disease (2021) · Cochrane
no estimate extracted3 studies · 219 participantsUngraded