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Related Concept Videos

Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia

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Intravenous regional anesthesia or the Bier block technique is used to anesthetize a specific limb or extremity. It uses exsanguinated or blood-drained vessels to transport local anesthetics or LAs to the peripheral nerve trunks. Lidocaine without vasoconstrictors like epinephrine is most commonly used for this technique. Other drugs used are prilocaine, ropivacaine, and chloroprocaine. Bupivacaine is not recommended for this technique due to its high cardiac toxicity.
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Evaluating Tourniquet Efficacy Comparing Exsanguination Techniques for the Upper Extremity.

Tyler M Goodwin1,2,3,4,5, James P Davies1,2,3,4,5, J Benjamin Jackson1,2,3,4,5

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The Esmarch technique removes significantly more blood from the upper extremity before tourniquet use than gravity exsanguination, especially in patients over 40. This improves surgical visibility and safety in orthopaedic procedures.

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Area of Science:

  • Orthopaedic Surgery
  • Medical Devices
  • Surgical Techniques

Background:

  • Tourniquets are standard in orthopaedic surgery for improved visibility and reduced blood loss.
  • Limb exsanguination methods vary, but their comparative efficacy is not well-quantified.
  • Effective exsanguination is crucial for optimal tourniquet performance and patient safety.

Purpose of the Study:

  • To quantitatively compare the efficacy of gravity exsanguination versus Esmarch exsanguination for upper extremity blood removal before tourniquet inflation.
  • To assess the influence of patient demographics, including age, on exsanguination effectiveness.
  • To provide robust data supporting or refuting current clinical practices in exsanguination techniques.

Main Methods:

  • A plethysmographic water displacement method was used to measure blood volume removed from the upper extremity.
  • Volunteers underwent control measurements, followed by exsanguination using either gravity or Esmarch techniques.
  • Patient data including age, gender, height, weight, BMI, and handedness were recorded as covariates.

Main Results:

  • Esmarch exsanguination removed 51.2% more blood volume compared to gravity exsanguination (56.3 ml vs. 37.2 ml increase from control).
  • Age was a significant factor, with the Esmarch technique being most effective in individuals over 40 years old.
  • The Esmarch method demonstrated superior efficacy across all measured demographics.

Conclusions:

  • The Esmarch technique is significantly more effective than gravity exsanguination for upper extremity blood removal prior to tourniquet use.
  • Older patients (over 40) experience the greatest benefit from the Esmarch method.
  • This study supports the continued use of the Esmarch technique in orthopaedic extremity surgery due to its enhanced efficacy.