Articles: nerve-block.
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To test the hypothesis that poststimulation block of nerve conduction can be achieved by low-frequency (≤1 kHz) biphasic stimulation (LFBS). ⋯ This study discovered that LFBS (≤1 kHz), like high-frequency (≥5 kHz) biphasic stimulation (HFBS), can induce poststimulation block. The result provides support for the theory that biphasic stimulation waveforms block axonal conduction by changing intracellular and extracellular ion concentrations. The post-LFBS block provides the opportunity to develop new neuromodulation devices for clinical applications where initial nerve firing is acceptable.
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Review Meta Analysis
Celiac Plexus Block - An Old Technique with New Developments.
Celiac plexus block (CPB) is an interventional technique known to be effective in the management of abdominal pain caused by pancreatic cancer. ⋯ Over the years, the majority of clinical trials have focused on fluoroscopy-guided CPB. Computed tomography-guided blockade of celiac plexus is the next choice among pain physicians and percutaneous ultrasound-guided CPB is a relatively new technique. The data generated over the years does not point to a single technique being the gold standard for CPB and choice of technique may be guided by the individual's preference, familiarity with the technique, and institutional practice.
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Meta Analysis
The Use of Magnesium Sulfate and Peripheral Nerve Blocks: An Updated Meta-analysis and Systematic Review.
With the popularization of ultrasound, nerve blocks have been widely implemented in current clinical practice. Although, they have seen limited success due to their shorter duration and suboptimal analgesia. Magnesium sulfate as a local anesthetic adjuvant for peripheral nerve blocks could enhance the effects of local anesthetics. However, previous investigations have not thoroughly investigated the analgesic efficacy of magnesium sulfate as an adjunct to local anesthetics for peripheral nerve blocks. Thus, we attempted to fill the gap in the existing literature by conducting a meta-analysis. ⋯ Adjuvant magnesium sulfate enhanced the anesthetic effects of local anesthetics and improved postoperative analgesia following the perineural blockade.
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Reg Anesth Pain Med · Aug 2021
MRI and muscle enzymes do not support the diagnosis of local anesthetic myotoxicity: a descriptive case series.
The presence of thigh muscle edema as characterized by increased signal intensity on MRI has been used to support the diagnosis of presumed local anesthetic-induced myotoxicity reported after total knee arthroplasty (TKA) with continuous adductor canal block (CACB). However, neither postoperative baseline imaging appearance nor muscle enzyme values have been described in conjunction with this clinical scenario. Thus, the usefulness of MRI or enzymatic biomarkers of muscle injury for supporting the diagnosis of local anesthetic myotoxicity is unknown. ⋯ The non-specificity of these findings suggests that MRI and near normal muscle enzyme levels are of limited diagnostic value when there is clinical suspicion of local anesthetic myotoxicity in the setting of TKA with CACB.