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Other Techniques to Assess the Peripheral Nerve 

Other Techniques to Assess the Peripheral Nerve
Chapter:
Other Techniques to Assess the Peripheral Nerve
Author(s):

Jun Kimura

DOI:
10.1093/med/9780199738687.003.0010
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date: 18 June 2021

This chapter discusses various techniques that supplement nerve conduction studies.Electrophysiologic evaluations of the sympathetic and parasympathetic pathways help confirm a clinical diagnosis of autonomic neuropathy. Noninvasive studies for cardiovascular function include heart-rate (R-R intervals) variation with breathing, spectral analysis of heart rate, valsalva ratio and vagal reactivity tested by blood pressure, and heart-rate response to changes in posture and eyeball pressure. Other methods covered in this section include motor unit number estimates, assessment of refractory period after supramaximal stimulation, threshold tracking and threshold electrotonus with subthreshold stimulation, and other types of evaluation of nerve function such as microneurography and quantitaive sensory testing.

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