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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
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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...
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Area of Science:

  • Anesthesiology
  • Pain Management
  • Surgical Procedures

Background:

  • Digital nerve blocks (DNBs) are crucial for local anesthesia in minor digit procedures.
  • Various DNB techniques exist, but optimal methods for anesthesia adequacy and minimal pain are debated.
  • DNB approaches include dorsal (2 injections) and volar (1 injection) types.

Purpose of the Study:

  • To compare different digital nerve block techniques.
  • To evaluate time to anesthesia (TTA), duration of anesthesia (DOA), and injection pain.
  • To review anesthesia coverage and clinician/patient preferences.

Main Methods:

  • A meta-analysis of randomized controlled trials (RCTs) and prospective cohort studies.
  • Searched MEDLINE, EMBASE, and CENTRAL databases for relevant studies.
  • Included 23 papers evaluating DNB techniques and anesthetics, extracting data on TTA, DOA, pain, and anesthesia distribution.

Main Results:

  • No significant differences were found in TTA, DOA, or pain scores among DNB techniques.
  • Mean TTA was 4.5 minutes, mean DOA was 187 minutes, and mean pain score was 2.1/10.
  • Volar approaches may be preferred for reduced pain, while dorsal approaches might offer better dorsal coverage.

Conclusions:

  • No single DNB technique demonstrated superiority in TTA, DOA, or pain.
  • Patient and clinician preference may favor single-injection volar techniques.
  • Dorsal approaches might provide superior anesthesia coverage for the proximal dorsal digit.