Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,345 questions · 4,525 findings · 483 reviews

No studies found 1,024 · 22.6%GRADE not reported 388 · 8.6%Very low 1,172 · 25.9%Low 1,227 · 27.1%Moderate 576 · 12.7%High 138 · 3%

PTFE vs PTFE with vein cuff

Primary patency ( · people with peripheral vascular disease requiring below‐knee femoro‐popliteal bypass surgery

It is very uncertain whether PTFE changes primary patency (24 months) compared with PTFE with vein cuff (very low certainty).

2 findings from 1 review

PTFE vs PTFE with vein cuff

Secondary patency (24 months) · people with peripheral vascular disease requiring below‐knee femoro‐popliteal bypass surgery

It is very uncertain whether PTFE changes secondary patency (24 months) compared with PTFE with vein cuff (very low certainty).

1 finding from 1 review

PTFE vs PTFE with vein cuff

Limb salvage · people with peripheral vascular disease requiring below‐knee femoro‐popliteal bypass surgery

PTFE showed no clear difference in limb salvage (24 months) compared with PTFE with vein cuff (low certainty).

1 finding from 1 review

Autologous vein vs other graft types

Secondary patency (24 months) · people with peripheral vascular disease requiring above‐knee femoro‐popliteal bypass surgery

Autologous vein may leads to lower secondary patency (60 months) compared with other graft types (low certainty).

1 finding from 1 review

PTFE vs Dacron

Primary patency ( · people with peripheral vascular disease requiring above‐knee femoro‐popliteal bypass surgery

PTFE showed no clear difference in primary patency (24 months) compared with dacron (low certainty).

2 findings from 1 review

PTFE vs Dacron

Secondary patency (24 months) · people with peripheral vascular disease requiring above‐knee femoro‐popliteal bypass surgery

PTFE may leads to higher secondary patency (24 months) compared with dacron (low certainty).

1 finding from 1 review

PTFE vs Dacron

Limb salvage · people with peripheral vascular disease requiring above‐knee femoro‐popliteal bypass surgery

PTFE showed no clear difference in limb salvage (24 months) compared with dacron (low certainty).

1 finding from 1 review

Preoperative radiotherapy vs surgery

Overall mortality ‐ only total mesorectal excision ( · People with localised rectal carcinoma

Preoperative radiotherapy showed no clear difference in overall mortality ‐ only total mesorectal excision ( compared with surgery alone (low certainty).

1 finding from 1 review

Alpha2‐adrenergic agonist vs control

Bradycardia (requiring pharmacological or pacemaker treatment during the period of study drug administration) · adults undergoing cardiac surgery

Alpha‐2 adrenergic agonists probably leads to higher bradycardia (requiring pharmacological or pacemaker treatment during… compared with control (moderate certainty).

1 finding from 1 review

Alpha2‐adrenergic agonist vs control

Hypotension (requiring treatment with inotropes or vasopressors during the period of study drug administration) · adults undergoing cardiac surgery

Alpha‐2 adrenergic agonists showed no clear difference in hypotension (requiring treatment with inotropes or vasopressors… compared with control (low certainty).

1 finding from 1 review