Publications by authors named "Dwayne S Yamasaki"

Article Synopsis
  • Focal entrapment of the common fibular nerve (CFN) is a common issue in the lower body that can be hard to diagnose, with a temporary strengthening response known as the "Phoenix sign" sometimes observed after lidocaine blocks.
  • A study involving 20 patients tested the effects of two vasodilating agents, lidocaine and papaverine, on improving muscle strength in the anterior compartment by measuring the extensor hallucis longus (EHL) muscle before and after treatment.
  • Results showed that both agents produced significant improvements in muscle strength without notable differences between them, suggesting the Phoenix Effect is likely due to improved local blood circulation.
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Despite 20 years of research and new treatment methods, diabetic foot ulcer (DFU) remains a common problem with frequent recurrences and complications. There are reports that nerve decompression (ND) surgery has been observed to produce significantly fewer DFU recurrences than standard of care (SOC). The explanation of this apparent superiority has not been understood.

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Study Aims:  Electromyographic (EMG) recordings of the fibularis longus and tibialis anterior muscles were performed intraoperatively during nerve decompression (ND) of the common fibular nerve (CFN) in patients with symptomatic diabetic sensorimotor peripheral neuropathy. Patient demographics and clinical attributes were compared against changes in EMG after ND and analyzed for possible correlations.

Methods:  Intraoperative changes in CFN EMG were analyzed for correlations against sex, age, body mass index (BMI), hemoglobin A1c (A1c), and type and duration of diabetes.

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Article Synopsis
  • Electromyographic (EMG) recordings were taken during surgery on patients with diabetic sensorimotor peripheral neuropathy (DSPN) to assess muscle function before and after nerve decompression surgery.
  • Out of 46 legs in 40 patients, 82.6% showed improvement in EMG readings one minute post-surgery, indicating better muscle response.
  • The study found that these EMG improvements were significant, correlating with reduced pain levels, suggesting that nerve decompression can enhance muscle function in patients with nerve compression due to DSPN.
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This article describes the benefits of intraoperative neurophysiologic monitoring (IONM) and proposes methods for integration into nerve decompression procedures. Standard procedures for intraoperative nerve monitoring (IONM) are illustrated as they would apply to the 3 nerve tunnels that have significant motor components within the lower extremity.

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Objectives: To describe the angiographic characteristics of pelvic arterial disease in patients with erectile dysfunction (ED) nonresponsive to phosphodiesterase-5 inhibitors (PDE5i) and suspected coronary artery disease (CAD).

Background: ED and CAD share common risk factors which can result in endothelial dysfunction, atherosclerosis and flow-limiting stenoses in the coronary and internal pudendal arteries.

Methods: Ten patients undergoing cardiac catheterization with ED and a history of unsatisfactory response to a PDE5i were studied.

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