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Local Anesthetics: Clinical Application as Epidural Anesthesia

Local Anesthetics: Clinical Application as Epidural Anesthesia

Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...

Local Anesthetics: Clinical Application as Spinal Anesthesia

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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: 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.
One of the advantages of...

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Anesthesia is a medical procedure that uses drugs for CNS suppression to enable painless surgeries and procedures. The selection of anesthetics is influenced by their pharmacokinetic properties, side effects, and patient characteristics. Various types of anesthesia include general, local, regional, spinal, and inhalational.
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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.

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Spinal Sonography for Ultrasound-Guided Lumbar Neuraxial Anesthesia

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Epidural block: technical aspects and complications.

Kathryne A Faccenda¹, Brendan T Finucane

¹Department of Anesthesiology and Pain Medicine, University of Alberta Hospital, Edmonton, Alberta, Canada. faccenda@ualberta.ca

Current Opinion in Anaesthesiology

|October 5, 2006

Summary

Accurate epidural catheter placement is crucial for patient safety. New techniques like electrical stimulation and ultrasound offer improved accuracy over traditional test doses, especially for patients on anticoagulants.

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Area of Science:

Anesthesiology
Neurosurgery
Medical Devices

Background:

Continuous epidural anesthesia relies on test doses for catheter placement confirmation, which can be inaccurate.
Potential neurological complications include direct nerve trauma and damage from irritant drugs.
Epidural use in coronary artery bypass graft surgery is debated due to hematoma risks.

Purpose of the Study:

To review new techniques for verifying epidural needle and catheter placement.
To highlight challenges in performing epidural anesthesia in patients receiving anticoagulant therapy.

Main Methods:

Electrical stimulation of the catheter.
Ultrasound imaging for epidural placement.
Application of geometric principles.

Main Results:

Traditional test doses lack consistent accuracy.
Emerging techniques aim to enhance the precision of epidural placement.
Anticoagulant use, particularly low molecular weight heparins, complicates safe epidural administration.

Conclusions:

Meticulous technique is essential when injecting drugs into the epidural space.
Advancements in technology are needed to improve the safety and accuracy of epidural anesthesia.
Careful consideration of patient anticoagulation status is vital for risk mitigation.