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Related Concept Videos

Local Anesthetics: Common Agents and Their Applications01:23

Local Anesthetics: Common Agents and Their Applications

Local anesthetics (LAs) are commonly used for various applications in medical and dental procedures. Some of the common agents used are cocaine, lidocaine, and bupivacaine.
Cocaine is an ester of benzoic acid and methylecgogine. It is used to anesthetize and vasoconstrict locally. Currently, it is used primarily for topical applications. It is beneficial for surgeries on the upper respiratory tract, providing anesthesia and shrinking the mucosa. Cocaine in the form of cocaine hydrochloride is...
Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

Local Anesthetics: Clinical Application as Spinal Anesthesia

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...
Local Anesthetics: Chemistry and Structure-Activity Relationship01:30

Local Anesthetics: Chemistry and Structure-Activity Relationship

Local anesthetics (LAs) are drugs that induce a temporary loss of sensation in a limited body area, preventing pain. Cocaine was the first local anesthetic discovered in the late 19th century. Cocaine is a benzoic acid ester obtained from the leaves of coca shrubs and was often used for its psychotropic effects. Cocaine was first isolated in 1860 by Albert Niemann. Sigmund Freud studied the physiological actions of cocaine. Carl Koller later introduced it into clinical practice in 1884 as a...
Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia01:30

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

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...
Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia

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...
Local Anesthetics: Pharmacokinetics01:13

Local Anesthetics: Pharmacokinetics

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...

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Related Experiment Video

Updated: Jun 16, 2026

Modeling Cataract Surgery in Mice
05:19

Modeling Cataract Surgery in Mice

Published on: December 1, 2023

Local anesthesia for cataract surgery.

Adeela Malik1, Emily C Fletcher, Victor Chong

  • 1Department of Ophthalmology, Epsom & St. Helier University Hospitals, Carshalton, United Kingdom. adeela15malik@gmail.com

Journal of Cataract and Refractive Surgery
|February 2, 2010
PubMed
Summary
This summary is machine-generated.

Local anesthesia for cataract surgery involves reviewing anesthetic agents, techniques, and complications. Further trials are needed to confirm the efficacy of various local anesthesia methods for optimal patient outcomes.

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Area of Science:

  • Ophthalmology
  • Anesthesiology

Background:

  • Cataract surgery commonly utilizes local anesthesia.
  • Understanding anesthetic agents and ocular nerve interaction is crucial.
  • Various clinical techniques exist with associated complications.

Purpose of the Study:

  • To review local anesthesia for cataract surgery.
  • To compare clinical techniques based on efficacy, akinesia, and pain.
  • To examine current practice patterns in the UK and US.

Main Methods:

  • Literature review of anesthetic agents and techniques.
  • Comparative evaluation of efficacy, akinesia, and patient-perceived pain.
  • Analysis of practice patterns among refractive surgeons.

Main Results:

  • Efficacy, akinesia, and pain perception vary across techniques.
  • Practice patterns differ between the UK and US.
  • Current data suggests a need for more robust evidence.

Conclusions:

  • More randomized clinical trials are required for meta-analysis.
  • Evidence is needed to definitively establish benefits of local anesthesia.
  • Findings are relevant for ophthalmology and anesthesia training programs.