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Related Concept Videos

Local Anesthetics: Pharmacokinetics01:13

Local Anesthetics: Pharmacokinetics

900
The potency and duration of action of local anesthetics (LAs) are determined by their pharmacokinetics. Pharmacokinetics describes how LAs are absorbed, distributed, metabolized, and eliminated from the body. When administered to the vascular tissues, LAs are quickly absorbed and enter the systemic circulation, reducing their localized effects. Adding vasoconstrictors such as epinephrine to LAs reduces their absorption into the systemic circulation, making them clinically effective. The...
900
Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia

630
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.
One of the advantages of...
630
Local Anesthetics: Adverse Effects01:12

Local Anesthetics: Adverse Effects

516
While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...
516
Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia01:30

Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia

1.3K
Depending on the target organ, local anesthetics (LAs) can be administered via various routes. In surface anesthesia, LAs are applied directly to the surface of the skin or mucous membranes. It is widely used for topical skin numbing before venipuncture or minor surgical procedures. Commonly used surface local anesthetics are lidocaine or benzocaine sprays or creams. Surface anesthesia occurs within 5 minutes and lasts for about 60 minutes. One of the main disadvantages of topical anesthesia is...
1.3K
Parenteral Anesthetics: Overview01:24

Parenteral Anesthetics: Overview

228
Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
228
Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

Local Anesthetics: Clinical Application as Spinal Anesthesia

866
Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
866

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Related Experiment Video

Updated: Oct 3, 2025

Assessing Changes in Volatile General Anesthetic Sensitivity of Mice after Local or Systemic Pharmacological Intervention
08:49

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When Regional Anesthesia Met Pharmacokinetics.

Laurence E Mather1, Geoffrey T Tucker2

  • 1From the University of Sydney, Sydney, Australia.

Anesthesiology
|February 16, 2022
PubMed
Summary
This summary is machine-generated.

Pharmacokinetic analysis of local anesthetic agents helps determine optimal drug selection and dosage for regional blocks. Understanding drug absorption and disposition is crucial for anesthesiologists.

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Area of Science:

  • Anesthesiology
  • Pharmacology
  • Clinical Chemistry

Background:

  • Local anesthetics are vital for regional anesthesia.
  • Understanding their absorption and distribution is key for safe and effective use.
  • Pharmacokinetic principles can quantify drug behavior in the body.

Purpose of the Study:

  • To apply pharmacokinetic analysis to local anesthetic agents.
  • To enhance the understanding of local anesthetic disposition and absorption.
  • To aid anesthesiologists in selecting optimal agents and dosages for regional blocks.

Main Methods:

  • Analysis of blood concentration data from local anesthetic agents.
  • Application of pharmacokinetic modeling to interpret drug disposition.
  • Quantitative assessment of drug absorption and distribution.

Main Results:

  • Pharmacokinetic analysis provides valuable insights beyond simple blood concentration measurements.
  • Quantitative data on disposition and absorption were derived.
  • The study demonstrates the utility of pharmacokinetic principles in this context.

Conclusions:

  • Pharmacokinetic analysis is a powerful tool for understanding local anesthetic behavior.
  • Improved understanding of drug disposition and absorption aids clinical decision-making.
  • This approach assists anesthesiologists in optimizing regional anesthesia techniques.