Intravenous regional anesthesia
A technique for anesthesia of a limb
Intravenous regional anesthesia (IVRA), also known as Bier block, is a technique used to anesthetize a limb for surgical procedures. It involves the administration of a local anesthetic into the venous system of the limb, which is isolated from the rest of the circulation by a tourniquet.
History[edit | edit source]
The technique was first described by the German surgeon August Bier in 1908. Bier's method involved the use of a tourniquet to occlude blood flow to the limb, followed by the injection of a local anesthetic into the venous system. This method provided effective anesthesia for limb surgeries and has been refined over the years.
Technique[edit | edit source]
The procedure begins with the application of a tourniquet to the limb to be anesthetized. The tourniquet is inflated to a pressure higher than the patient's systolic blood pressure to occlude arterial blood flow. Once the tourniquet is in place, a local anesthetic, such as lidocaine, is injected into a vein in the limb.
The anesthetic diffuses into the surrounding tissues, providing anesthesia to the entire limb. The tourniquet prevents the anesthetic from entering the systemic circulation, thus localizing its effects to the limb.
Applications[edit | edit source]
IVRA is commonly used for procedures on the extremities, such as hand or foot surgeries. It is particularly useful for short procedures, as the duration of anesthesia is limited by the time the tourniquet can be safely applied.
Advantages and Disadvantages[edit | edit source]
The primary advantage of IVRA is its simplicity and effectiveness for limb surgeries. It provides rapid onset of anesthesia and is relatively easy to administer. However, the duration of anesthesia is limited by the tourniquet time, and there is a risk of systemic toxicity if the tourniquet fails or is released prematurely.
Safety Considerations[edit | edit source]
To minimize risks, careful monitoring of the patient is essential. The tourniquet should not be applied for more than 90 minutes to prevent ischemic damage to the limb. Additionally, the use of a limb protection sleeve can help prevent skin damage from the tourniquet.
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