Bier Block

Anatomy and Physiology

Relevant anatomy for a Bier block includes the location and distribution of nerves and veins of the upper and lower extremities, especially in the hand and antecubital fossa of the upper extremity, and the foot and ankle of the lower extremity. The superficial and deep venous networks in the hand, forearm, and wrist facilitate anesthetic distribution after exsanguination and tourniquet inflation. The spread of local anesthetics then occurs rapidly. A similar mechanism applies to the lower extremity. Due to their lipophilic nature, local anesthetics, once administered intravenously, diffuse into nearby nerve fibers and block voltage-gated sodium channels on neuronal membranes. The influx of sodium ions into neurons ceases, and the initiation of neuronal depolarization and action potential propagation is inhibited; pain signal transmission to the central nervous system is interrupted.[14] A pneumatic tourniquet inflated to 50 to 100 mm Hg above the systolic blood pressure minimizes systemic distribution of the anesthetic.

Indications

The Bier block is ideal for patients at high risk for general anesthesia, procedures with minimal expected postoperative pain, mass casualty situations involving the extremities, and low-resource settings. Exsanguination is performed with an Esmarch bandage, which may be uncomfortable; adjunct analgesia is used. 

Traditional Applications

Traditional indications for Bier block include lower-extremity (distal to the knee) and upper-extremity (hand, wrist, or forearm) procedures lasting less than 60 minutes and with minimal postoperative pain. Standard plastic surgery procedures include carpal tunnel release, trigger finger release, tendon repair, laceration repairs, burn debridement, and foreign body removal. Orthopedic procedures, including Colles fractures, noncomplex wrist and forearm fractures, and dislocations, are routinely performed with IVRA. The method effectively reduces upper extremity fractures in pediatric populations, providing safe, efficient, and cost-effective analgesia compared with conscious sedation. Lower complication rates and fewer interventions for cast tightness have been reported with the Bier block compared with sedation.[1]

Modern Expansions

Placing a tourniquet on the forearm provides equivalent anesthesia with a 50% to 70% reduction in lidocaine dose, improved patient comfort, and reduced need for sedation, without compromising surgical outcomes. Combined forearm IVRA plus hematoma block for distal radius fracture reduction improves analgesia and significantly reduces opioid use.[1][2][3][4][5][6][7][8] The Bier block has been used successfully for pain relief in patients with palmar hyperhidrosis receiving botulinum toxin injections and as an adjunct in the treatment of patients with complex regional pain syndrome type 1, offering an alternative to repeated stellate ganglion blocks.[12][13] These expanded indications highlight IVRA’s evolving versatility, particularly in outpatient and orthopedic trauma care.

Contraindications

Absolute and relative contraindications must be identified and evaluated during the preprocedure assessment to minimize the risk of complications. These contraindications are summarized in Table 1.

Table 1. Contraindications to the Bier block (IVRA)

Preparation

The following are steps that should be undertaken in preparation for the procedure:

1. Monitors and machine: Ensure that the anesthetic monitoring machine is fully operational and that standard monitors, including blood pressure, heart rate, pulse oximetry, and electrocardiogram (baseline and intraprocedure), are available.
2. Intravenous access and fluids: Sterile skin preparation set, syringes (20–22 gauge), a 30 to 50 mL Luer-lock syringe, a 500-mL or 1-L bag of crystalloid intravenous fluid, and an infusion set.
3. Exsanguination and occlusion: Rubber band, padding (eg, Webril), Esmarch bandage, adhesive tape, and a double pneumatic tourniquet system.
4. Local anesthetic agents: Traditionally, lidocaine 0.25% to 0.1% or prilocaine 0.5% is used for this block. More recently, ropivacaine has demonstrated prolonged sensory blockade and fewer central nervous system adverse effects than lidocaine. Bupivacaine has been used successfully, even though routine use is not recommended due to the significant risk of refractory cardiac arrest.[1][2][3][4][15]
5. Resuscitation drugs: In addition to standard emergency drugs, have 20% lipid emulsion for local anesthetic systemic toxicity management (and methylene blue for methemoglobinemia if prilocaine is used).
6. Adjuncts: Additional medications can enhance analgesia, reduce tourniquet discomfort, shorten onset, improve postoperative pain, and increase patient satisfaction. Common agents include ketorolac (15–30 mg), ketamine, midazolam, dexmedetomidine (0.5–1 mcg/kg), and dexamethasone (4–8 mg). Table 2 lists common adjuncts for the Bier block.

When combined with lidocaine in forearm IVRA, ketorolac significantly reduces postoperative pain and tourniquet discomfort, lowers sedation needs, and is better supported than any other adjunct. Other nonsteroidal anti-inflammatory drugs have less favorable outcomes. α-2 Agonists (clonidine 1–2 mcg/kg, dexmedetomidine 0.5–1 mcg/kg) added to lidocaine extend sensory and motor block duration and improve pain control, though supporting evidence results from small trials. When added to lidocaine or ropivacaine, dexmedetomidine is superior to clonidine in terms of the onset time of sensorimotor blockade, prolongation of sensory recovery, and reduction of intraoperative and postoperative pain scores. Ketamine 50 mg reduces intraoperative analgesic needs and enhances postoperative pain relief.[1][2][5][16][17][18][19][20]

Results from several studies show that fentanyl and other adjuvants allow lower lidocaine concentrations with good results, but findings on their effectiveness and adverse effects are inconsistent. Meperidine 30 mg alone can also produce effective blocks, with higher rates of adverse effects such as nausea, vomiting, and dizziness. Neuromuscular blocking agents combined with IVRA accelerate the onset of sensory and motor blockade and prolong the duration of motor blockade, while maintaining anesthetic quality comparable to that of standard IVRA.

Several agents have been studied as adjuvants to local anesthetics in Bier blocks, such as corticosteroids in patients with rheumatoid arthritis, acetaminophen, nitroglycerin, midazolam, and magnesium sulfate. However, more studies are needed to establish the efficacy, cost-effectiveness, and optimal dosing of these agents. There is limited data on the use of neuromuscular blockers to improve motor block onset and surgical conditions; thus, their use lacks broad clinical validation.[1][21][22][23][24][25][26]

Table 2. Adjuvants to Local Anesthetics Used in Bier Block (IVRA)

Technique or Treatment

The following are the steps of the Bier block procedure (see Image. Steps of a Bier Block Procedure):

1. Intravenous access placement and exsanguination

• Using strict aseptic precautions, place a well-functioning intravenous catheter (20-gauge) distal to the surgical site. A second intravenous catheter should be placed in a nonoperated extremity site for perioperative use.
• Apply soft, conforming padding (eg, Webril) and place a double-pneumatic tourniquet on the proximal cuff high on the upper extremity.
• Elevate the limb for 1 to 2 minutes, then apply a rubber Esmarch bandage around the arm, spiraling from the fingertips to the distal cuff of the double tourniquet to exsanguinate the arm. 
• Note: Improper exsanguination may result in incomplete anesthesia due to residual blood flow and increase the risk of local anesthetic systemic toxicity.

2. Tourniquet inflation

• Inflate the proximal cuff to 50 to 100 mm Hg above systolic blood pressure and confirm occlusion (no distal pulse/plethysmography). The Esmarch bandage is then removed before anesthetic injection.
• Forearm tourniquet technique (if using): Place the tourniquet just distal to the elbow crease. This technique provides a similar anesthetic quality with reduced medication requirements, improved comfort, and decreased sedation and postoperative care unit time.[3][4]
• Single cuff systems are simpler but less comfortable, especially for procedures lasting longer than 20 minutes. They are generally reserved for short interventions or when double-cuff systems are unavailable.[3][4][5]
• Inadequate pressure (fails to occlude circulation), deflation before the minimum time, and a poor seal that leads to leakage of anesthetic and incomplete anesthesia.

3. Anesthetic injection

• Administer preservative-free, epinephrine-free 0.5% lidocaine at a dose of approximately 3 to 4 mg/kg. The volume is typically 30 to 50 mL for the upper extremity technique, but with the forearm technique, 8 to 15 mL may suffice when administered with adjuncts like ketorolac. Conversely, 150 mL of 0.25% lidocaine is commonly used for lower extremity blocks. Ropivacaine and prilocaine 0.5% at a dose of 3 mg/kg are alternatives to lidocaine.[1][2][3][4][5][27]
• Using a proper dose of local anesthetic and adjuncts may mitigate the risk of inadequate anesthesia.

4. Tourniquet duration and release

• Maintain full inflation for at least 20 to 30 minutes; extended durations increase the risk of toxicity upon release. Employ cyclical deflation (deflate for 10 seconds, reinflate for 1 minute) or gradual release to minimize bolus systemic absorption of local anesthetics and metabolic waste.

Complications

Complications

Complications arising from the Bier block are rare. Recent randomized controlled clinical trials using forearm techniques report no significant complications, reinforcing the safety of contemporary practice.[1][2][3][4][5][27] From 1980 to 1999, the American Society of Anesthesiologists' Closed Claims Project reported 3 cases of death or brain damage related to IVRA. These complications and the necessary interventions are summarized in Table 3.

Table 3. Complications of the Bier Block (IVRA)

Clinical Significance

Bier blocks are widely used, providing safe, effective, and cost-efficient anesthesia for short-duration extremity surgeries in various environments.

• Efficiency: Rapid onset, simple equipment, potential to avoid postoperative care unit stays
• Safety: Low risk when standardized protocols are followed
• Comfort: Forearm techniques and adjuncts reduce pain and sedation needs
• Adaptability: Used in outpatient clinics, emergency departments, ambulatory surgery centers, and low-resource settings

Ketorolac is well supported as an adjunct to reduce postoperative pain. Broader use of IVRA may depend on ongoing trials confirming the safety of other agents like dexmedetomidine. Advances in monitoring, pharmacokinetics, and tourniquet technology will likely offer further improvements. Focusing on safety, role clarity, and standardized checklists underpins ongoing excellence in Bier block practice. Although local anesthesia systemic toxicity and methemoglobinemia are rare, knowledge and readiness for treatment are essential.

Enhancing Healthcare Team Outcomes

To enhance patient-centered care, outcomes, and patient safety, coordinated, interprofessional collaboration is necessary:

• Preprocedure teamwork: Nurses, anesthesiologists, and surgeons should identify the indication, assess contraindications, and obtain informed consent before the procedure.
• Equipment preparation: Operating room personnel should ensure the tourniquet is functional and that Esmarch bandages are available. Resuscitation equipment should be present, including 20% lipid emulsion and methylene blue if prilocaine is used.
• Intraprocedure monitoring: Standard American Society of Anesthesiologists' monitors should be used to monitor vital signs. The anesthesia team should monitor patient comfort and, together with the surgical and nursing teams, remain aware of the tourniquet status and duration of inflation, and address potential complications such as local anesthesia systemic toxicity. 
• Postprocedure surveillance: After the cuff is deflated, the team should observe for signs of reperfusion syndrome and local anesthesia systemic toxicity, manage analgesia, and assess the extremity for ischemia or nerve injury.
• Quality improvement: The team should also collect outcomes data (eg, incidence of tourniquet pain, episodes of local anesthesia systemic toxicity, postoperative care unit time, and patient satisfaction) to refine protocols and drive continuous practice improvement.