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Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

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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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Single-stage Dynamic Reanimation of the Smile in Irreversible Facial Paralysis by Free Functional Muscle Transfer
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Predicting Depressor Anguli Oris Excision Outcomes Using Local Muscle Block.

Samuel P O'Rourke1, Matthew Q Miller2

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Summary
This summary is machine-generated.

Depressor anguli oris (DAO) muscle block effectively predicts smile symmetry changes after DAO myectomy. However, surgical excision typically yields greater improvements in dental show and oral commissure symmetry than the block alone.

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Area of Science:

  • Plastic Surgery
  • Facial Reanimation
  • Aesthetic Medicine

Background:

  • The depressor anguli oris (DAO) muscle plays a crucial role in lower facial expression.
  • DAO muscle block is utilized to predict surgical outcomes in patients with facial paralysis.
  • Correlation between DAO block effects and subsequent myectomy outcomes on smile symmetry remains under-explored.

Purpose of the Study:

  • To compare smile symmetry changes following DAO muscle block versus DAO myectomy.
  • To evaluate the predictive value of DAO block for myectomy results.
  • To analyze specific quantitative measures of smile changes.

Main Methods:

  • Prospective study of nonflaccid facial paralysis patients undergoing DAO excision.
  • Quantification of dental show, oral commissure excursion, and smile angle.
  • Measurements taken at baseline, post-DAO block, and post-myectomy.

Main Results:

  • DAO excision demonstrated statistically significant improvements in dental show (p=0.006) and oral commissure excursion (p=0.024) symmetry compared to DAO block.
  • A strong correlation was observed between oral commissure excursion symmetry changes after block and myectomy.
  • Moderate correlations were found for changes in smile angle and dental show symmetry.

Conclusions:

  • DAO muscle block serves as a reliable predictor for smile symmetry post-myectomy.
  • DAO myectomy generally results in superior improvements in dental show and oral commissure symmetry compared to the effects of a DAO block.
  • The study highlights the nuances in outcome prediction and surgical efficacy for DAO interventions.