Surface recording of the H‐reflex of the flexor carpi radialis

Jabre, Joe F.

doi:10.1002/mus.880040514

Cited by 81 publications

(31 citation statements)

References 4 publications

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“…27 It has been used with technical modifications to evaluate most of the lumbosacral roots that sustain compressive radiculopathies, 130 and a few reports have described the utility of assessing the C6 and C7 roots by recording an H response from the flexor carpi radialis muscle while stimulating the median nerve at the elbow. 49,98,102,130 Nevertheless, the only H-reflex study that enjoys wide popularity is that assessing the S1 fibers; this involves stimulating the tibial nerve while recording from the gastrocnemius-soleus muscle group. 1,24,26,134 There is almost universal agreement that H-wave studies, because of their sensitivity, may be helpful with radiculopathy assessment.…”

Section: Conventional Motor and Sensory Nerve Conductionmentioning

confidence: 99%

AAEM Minimonograph 32: The electrodiagnostic examination in patients with radiculopathies

1998

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Section: Conventional Motor and Sensory Nerve Conductionmentioning

confidence: 99%

AAEM Minimonograph 32: The electrodiagnostic examination in patients with radiculopathies

1998

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“…Paraesthesia occurred in thumb and index finger in eight and in digit 2 alone in three of 11 patients with root C6 compression. In root C7 compression paraesthesia was present in digits 2 and 3 in five patients, in digits 1, 2 Compression of the nerve roots was caused by protrusion of a cervical disc in 29 patients, a spondylotic spur in one patient, metastasis from breast cancer to one side of the seventh cervical and first thoracic vertebrae in one patient, and a unilateral epidural metastatic mass from breast cancer extending from the seventh cervical to the fourth thoracic vertebra in one patient. The latter three patients and one of the former 29 patients had a C8 root compression.…”

Section: Methodsmentioning

confidence: 98%

The flexor carpi radialis H-reflex in lesions of the sixth and seventh cervical nerve roots.

Schimsheimer¹,

Visser²,

Kemp³

1985

Journal of Neurology, Neurosurgery & Psychiatry

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SUMMARY In 143 normal subjects latencies of H-reflexes of the flexor carpi radialis muscle were well correlated with arm lengths. In 32 patients with injury to cervical roots C5 to C8 it was shown that latencies were only abnormal in lesions of roots C6 or C7. It is suggested that in most instances root C6 or C7 and, probably both roots in some cases are involved in the reflex pathway. Repeat electrophysiological examinations after surgery provided valuable data about the various types of nerve root recovery.Although the H-reflex of the flexor carpi radialis muscle is easily obtainable its diagnostic value has so far been scantily evaluated.'-3 The cervical nerve root involved in this reflex is unclear.In a previous study on changes in the flexor carpi radialis H-reflex in radiation-induced brachial plexus lesions, parameters have been determined for latency and conduction velocity.3 In this report normal latencies of the H-reflex were correlated with arm lengths. In addition, H-reflexes in patients with compression of a single cervical root shown by myelography were studied in order to gain information regarding H-reflex changes in such lesions and to evaluate the nerve root involved in the reflex pathway. Methods and materialsFlexor carpi radialis EMG and H-reflexes in both arms were performed by needle electrodes in both controls and patients. The method used to investigate the flexor carpi radialis H-reflex has been described previously.3 The median nerve in the cubital fossa was stimulated using a bipolar surface electrode with the cathode proximal. The stimulus frequency was one per five seconds, and the pulse duration 05 ms. The voltage was increased until a maximal H-reflex amplitude was obtained. After that supramaximal shocks were delivered to produce the maximal direct muscle (M) response. The H-reflex latency (H-RL) was measured at the beginning of the maximal H-reflex and the interlatency time (ILT) calculated by subtracting the max-

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“…4,15,22,23 The optimal technique for recording the reflex studies has been documented elsewhere. 4,[21][22][23] The FCR and ECR H reflexes do not necessarily require facilitation and can be obtained in approximately 60% to 70% and 10% to 20% of the time, respectively, without facilitation.…”

Section: Methodsmentioning

confidence: 99%

“…3,4,[21][22][23] Deschuytere et al, 5 and later Jabre, 15 described techniques for recording the H reflex of flexor carpi radialis (FCR) that have proved of value in evaluating peripheral neuropathies, 29 brachial plexus lesions, 25 and radiculopathies. 28 The use of a background contraction to facilitate the reflex response extends the value of reflex studies so that it is possible to assess virtually all accessible nerve roots in both the upper and lower limbs.…”

mentioning

confidence: 99%