SN4 SHORT NOTE 5M

Bier’s Block

General Surgery · Final Professional

Definition & Technique

Intravenous regional anaesthesia (Bier’s block) anaesthetises a limb (usually the forearm/hand) for short procedures. The limb is exsanguinated (elevated and an Esmarch bandage applied), a double-cuff tourniquet is inflated to isolate it from the circulation, and local anaesthetic (prilocaine or lignocaine — never bupivacaine) is injected intravenously, diffusing into the tissues to produce anaesthesia while the cuff is up.

Safety Points

The tourniquet must remain inflated for a minimum time (~20 minutes) before deflation, so that the LA is fixed in the tissues — premature deflation releases a bolus of LA systemically and can cause toxicity. Bupivacaine is absolutely contraindicated (cardiotoxic if released). Resuscitation equipment must be available.

DANGER / REMEMBER

The danger of Bier’s block is systemic toxicity from tourniquet failure or premature release. Keep the cuff inflated for the minimum time, use the double cuff correctly, and never use bupivacaine.

CLINICAL PEARL

Bier’s block = exsanguinate + tourniquet + IV prilocaine/lignocaine for short hand/forearm surgery; the two safety rules are don’t deflate the cuff early and never use bupivacaine.

Uses & Limitations

Bier’s block is valued for being simple, quick and reliable for short operations on the hand and forearm, providing good anaesthesia and a bloodless field, but it has clear limitations: the duration is bounded by how long the tourniquet can be tolerated, analgesia ends almost as soon as the cuff is released, and it is unsuitable for longer procedures or for the lower limb in most settings. The tourniquet itself causes discomfort after a while, which is one reason a double cuff is used, the distal cuff over an already-anaesthetised segment being inflated to relieve pain from the proximal cuff.

CLINICAL PEARL

Two rules make Bier’s block safe: keep the tourniquet inflated for the minimum time so the drug fixes in the tissues, and never use bupivacaine, whose cardiotoxicity would be catastrophic if released.

Premature cuff deflation causes systemic toxicity — never release early.

KEY POINT

Key points TO remember

IVRA: exsanguinate limb, inflate tourniquet, inject IV LA → anaesthesia while cuff inflated.
Use prilocaine/lignocaine — never bupivacaine (cardiotoxic).
Keep tourniquet up a minimum ~20 min; premature deflation → systemic toxicity.
For short forearm/hand procedures; resuscitation equipment ready.

EXAM TIP

Sources: Morgan & Mikhail’s Clinical Anesthesiology; Miller’s Anesthesia; Ajay Yadav’s Short Textbook of Anaesthesia.

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