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Related Concept Videos

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: Clinical Application as Epidural Anesthesia01:29

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...
Parenteral Anesthetics: Overview01:24

Parenteral Anesthetics: Overview

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.
Drug Delivery: Parenteral Route01:29

Drug Delivery: Parenteral Route

The parenteral route is a critical method of drug administration. It delivers compounds directly into the systemic circulation and bypasses the gastrointestinal tract. This approach is particularly advantageous for drugs that exhibit poor absorption or instability when administered orally.
There are three primary parenteral routes: intravenous (IV), intramuscular (IM), and subcutaneous (SC). The IV route introduces the drug directly into the bloodstream, ensuring immediate action. The IM route...

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An Experimental Paradigm for the Prediction of Post-Operative Pain (PPOP)
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Published on: January 28, 2010

The epidural test dose: a review.

Joanne Guay1

  • 1Department of Anesthesia, Maisonneuve-Rosemont Hospital, University of Montreal, Canada. joanne.guay@umontreal.ca

Anesthesia and Analgesia
|February 24, 2006
PubMed
Summary
This summary is machine-generated.

This review evaluates epidural test doses for detecting needle misplacement. Epinephrine and fentanyl show high sensitivity and positive predictive value for intravascular misplacements in adults, pregnant patients, and children.

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Area of Science:

  • Anesthesiology
  • Pain Management
  • Neurosurgery

Background:

  • Epidural anesthesia is a common procedure.
  • Accidental intravascular, intrathecal, or subdural catheter misplacement can lead to severe complications.
  • Reliable detection strategies are crucial for patient safety.

Purpose of the Study:

  • To systematically review the literature on the effectiveness of epidural test doses and other strategies.
  • To identify reliable methods for detecting epidural needle/catheter misplacements across different patient populations.

Main Methods:

  • Systematic literature review of randomized controlled trials.
  • Analysis of sensitivity and positive predictive values for various test doses.
  • Evaluation of detection strategies in nonpregnant adults, pregnant patients, and children.

Main Results:

  • For intravascular misplacements, epinephrine (10-15 mcg) demonstrated high sensitivity (80-100%) and PPV (83-100%) in nonpregnant adults.
  • Fentanyl (100 mcg) showed high sensitivity (92-100%) and PPV (91-95%) for detecting intravascular misplacement in pregnant patients.
  • Epinephrine (0.5 mcg/kg) was effective in children (S=81-100%, PPV=100%).

Conclusions:

  • Specific epidural test doses are effective in detecting intravascular misplacements in various patient groups.
  • Further research is needed to establish optimal strategies for detecting intrathecal and subdural epidural misplacements.