Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,072 questions · 4,237 findings · 447 reviews · Headline outcomes only

No studies found 946 · 22.3%GRADE not reported 257 · 6.1%Very low 1,121 · 26.5%Low 1,207 · 28.5%Moderate 568 · 13.4%High 138 · 3.3%

Double vs single‐injection technique

Primary anaesthesia failure (incomplete sensory block) · Adult patients undergoing hand, wrist or forearm surgery

Double leads to lower primary anaesthesia failure (incomplete sensory block) compared with single‐injection technique (high certainty).

1 finding from 1 review

Multiple vs single‐injection technique

Secondary analgesia failure : Tourniquet pain · Adult patients undergoing hand, wrist or forearm surgery

Multiple showed no clear difference in secondary analgesia failure ‐ tourniquet pain compared with single‐injection technique (high certainty).

1 finding from 1 review

Multiple vs double‐injection technique

Secondary analgesia failure: Intraoperative sedation required · Adult patients undergoing hand, wrist or forearm surgery

Multiple showed no clear difference in secondary analgesia failure ‐ intraoperative sedation required compared with double‐injection technique (high certainty).

1 finding from 1 review

Multiple vs double‐injection technique

Secondary analgesia failure : Tourniquet pain · Adult patients undergoing hand, wrist or forearm surgery

Multiple leads to lower secondary analgesia failure ‐ tourniquet pain compared with double‐injection technique (high certainty).

1 finding from 1 review

Double vs single‐injection technique

Secondary analgesia failure: Intraoperative sedation required · Adult patients undergoing hand, wrist or forearm surgery

Double showed no clear difference in secondary analgesia failure ‐ intraoperative sedation required compared with single‐injection technique (moderate certainty).

1 finding from 1 review