The Experts below are selected from a list of 26055 Experts worldwide ranked by ideXlab platform
Simon Podnar - One of the best experts on this subject based on the ideXlab platform.
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Phrenic Nerve Conduction studies: technical aspects and normative data.
Muscle & nerve, 2008Co-Authors: Anita Resman-gaspersc, Simon PodnarAbstract:In our clinical work we have occasionally encountered difficulties (e.g., no response, concomitant brachial plexus stimulation) in performing phrenic Nerve Conduction studies. The aim of this study was to overcome these difficulties and obtain our own set of normative data. In 29 healthy volunteers (15 men), aged 21-65 years, phrenic Nerve Conduction studies were performed using bipolar surface stimulation electrodes and a standard recording montage. Stimulation just above the clavicle, between the sternal and clavicular heads of the sternocleidomastoid muscles, elicited responses at the lowest stimulation strength, without concomitant brachial plexus stimulation. M-wave amplitude and duration changed with respiration, whereas latency and area did not. The normative limit for M-wave latency was 8.0 ms (upper), for amplitude it was 0.46/0.33 mV (lower: inspiration/expiration), and for area it was 4.4 mVms (lower). We suggest a slight modification of the generally used position for phrenic Nerve stimulation, and the use of M-wave latency and area (unaffected by the respiratory cycle) in future phrenic Nerve Conduction studies.
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phrenic Nerve Conduction studies technical aspects and normative data
Muscle & Nerve, 2007Co-Authors: Anita Resmangaspersc, Simon PodnarAbstract:In our clinical work we have occasionally encountered difficulties (e.g., no response, concomitant brachial plexus stimulation) in performing phrenic Nerve Conduction studies. The aim of this study was to overcome these difficulties and obtain our own set of normative data. In 29 healthy volunteers (15 men), aged 21–65 years, phrenic Nerve Conduction studies were performed using bipolar surface stimulation electrodes and a standard recording montage. Stimulation just above the clavicle, between the sternal and clavicular heads of the sternocleidomastoid muscles, elicited responses at the lowest stimulation strength, without concomitant brachial plexus stimulation. M-wave amplitude and duration changed with respiration, whereas latency and area did not. The normative limit for M-wave latency was 8.0 ms (upper), for amplitude it was 0.46/0.33 mV (lower: inspiration/expiration), and for area it was 4.4 mVms (lower). We suggest a slight modification of the generally used position for phrenic Nerve stimulation, and the use of M-wave latency and area (unaffected by the respiratory cycle) in future phrenic Nerve Conduction studies. Muscle Nerve, 2007
Naji Riachi - One of the best experts on this subject based on the ideXlab platform.
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the value of sensory Nerve Conduction studies in the diagnosis of guillain barre syndrome
Clinical Neurophysiology, 2021Co-Authors: Joumana Freiha, Romy Zoghaib, Karim Makhoul, Nancy Maalouf, Naji RiachiAbstract:Abstract Electrophysiology plays a determinant role in Guillain–Barre syndrome (GBS) diagnosis, classification, and prognostication. However, traditional electrodiagnostic (EDX) criteria for GBS rely on motor Nerve Conduction studies (NCS) and are suboptimal early in the course of the disease or in the setting of GBS variants. Sensory Nerve Conduction studies, including the sural-sparing pattern and the sensory ratio are not yet included in EDX criteria despite their well-established role in GBS diagnosis. The aim of this review is to discuss the diagnostic value of sensory NCS in GBS, their role in establishing the diagnosis and predicting the outcome according to the various subtypes of the disease.
Filiz Tutunculer - One of the best experts on this subject based on the ideXlab platform.
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clinical utility of dorsal sural Nerve Conduction studies in healthy and diabetic children
Clinical Neurophysiology, 2004Co-Authors: Nilda Turgut, Serap Karasalihoglu, Yasemin Kucukugurluoglu, Kemal Balci, Galip Ekuklu, Filiz TutunculerAbstract:Abstract Objective Monitoring of the dorsal sural sensory Nerve action potential (SNAP) is a sensitive method for detection of peripheral neuropathies. We tried to determine the normal dorsal sural Nerve Conduction values of the childhood population and assessed the clinical utility of this method in diabetic children who have no clinical sign of peripheral neuropathy. Methods In the study, 36 healthy and 27 diabetic children were included. In all subjects peripheral motor and sensory Nerve studies were performed on the upper and lower limbs including dorsal sural Nerve Conduction studies. Results The dorsal sural SNAP mean amplitude was 8.24±3.08 μV, mean latency was 2.47±0.48 ms, mean sensory Conduction velocity was 41.63±5.43 m/s in healthy children. Dorsal sural SNAPs were absent bilaterally in one diabetic patient. In the other 26 diabetic patients, the mean dorsal sural Nerve distal latency was longer (2.93±0.63 ms, P =0.004), mean SCV was slower than in healthy subjects (36.68±7.66 m/s, P =0.005). However, dorsal sural Nerve amplitude was not different between the groups. A dorsal sural Nerve latency of more than 2.9 ms had a sensitivity of 50% and a specificity of 75%. A dorsal sural Nerve velocity of less than 36 m/s had a sensitivity of 54% and a specificity of 92%. Conclusions We designated the reference values of the dorsal sural Nerve in healthy children. In addition, our findings suggest that dorsal sural Nerve Conduction studies may have value to determine neuropathy in the early stages in children with diabetes. Significance The dorsal sural Nerve Conduction studies in diabetic children may have value to determine the neuropathy in its early stages.
Charles F Bolton - One of the best experts on this subject based on the ideXlab platform.
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phrenic Nerve Conduction study in normal subjects
Muscle & Nerve, 1995Co-Authors: Robert Chen, Stephen J Collins, Hussein Remtulla, Anthony Parkes, Charles F BoltonAbstract:Phrenic Nerve Conduction studies were performed in 50 phrenic Nerves from 25 normal subjects using a technique modified from previously described methods. The normal ranges for latency, amplitude, negative peak area, and duration were established. The latency correlates with age and the amplitude increases with chest circumference. With our method, the amplitude increases and the duration decreases with lung volume. We found good right-left agreement and reproducibility. Therefore, the unaffected side can be used as a reference in unilateral phrenic Nerve lesions and previous studies can be used for comparison in serial studies. We recommend that phrenic Nerve Conduction studies be used routinely to diagnose and monitor patients with respiratory involvement from neuromuscular diseases.© 1995 John Wiley &Sons, Inc.
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Phrenic Nerve Conduction study in normal subjects.
Muscle & nerve, 1995Co-Authors: Robert Chen, Stephen J Collins, Hussein Remtulla, Anthony Parkes, Charles F BoltonAbstract:Phrenic Nerve Conduction studies were performed in 50 phrenic Nerves from 25 normal subjects using a technique modified from previously described methods. The normal ranges for latency, amplitude, negative peak area, and duration were established. The latency correlates with age and the amplitude increases with chest circumference. With our method, the amplitude increases and the duration decreases with lung volume. We found good right-left agreement and reproducibility. Therefore, the unaffected side can be used as a reference in unilateral phrenic Nerve lesions and previous studies can be used for comparison in serial studies. We recommend that phrenic Nerve Conduction studies be used routinely to diagnose and monitor patients with respiratory involvement from neuromuscular diseases.
Jay P Foreman - One of the best experts on this subject based on the ideXlab platform.
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clinical utility of dorsal sural Nerve Conduction studies
Muscle & Nerve, 2001Co-Authors: James M Killian, Jay P ForemanAbstract:A technique of testing sensory Nerve Conduction of the dorsal sural Nerve in the foot was used in 38 normal subjects and 70 patients with peripheral neuropathies. The normal dorsal sural sensory Nerve action potential (SNAP) had a mean amplitude of 8.9 microV (range 5-15 microV), mean latency to negative peak of 4.0 ms (range 3.2-4.7 ms), and mean Conduction velocity of 34.8 m/s (range 30-44 m/s). Optimal placement of the recording electrodes to obtain a maximal Nerve action potential was proximal to digits 4 and 5. Cooling to below 25 degrees C prolonged the latency but did not decrease the SNAP amplitude. Among the patients with peripheral neuropathy, dorsal sural SNAP was absent in 68 (97%), whereas only 54 (77%) showed abnormalities of sural sensory Conduction. The diagnostic sensitivity of sensory Nerve Conduction studies in peripheral neuropathies may be significantly improved by the use of this technique for evaluating the action potential of the dorsal sural Nerve.
