Abstract
We examined autonomic function in 46 patients with symmetric sensory non-insulin dependent diabetic neuropathy without autonomic symptoms and 31 age-matched control patients using the composite autonomic scoring scale (CASS) and electrophysiologic examination. The patients were divided into three groups by subjective severity of pain or numbness; 17 had slight pain or numbness, 15 had mild pain or numbness, and 14 had moderate pain or numbness. The patients in the moderate group had the following: a mild reduction in systolic and mean blood pressure (BP) within 1 minute of head-up tilt and a partial recovery after 5 minutes; an excessive fall in early phase II (IIe), an absence of late phase II (III) and reduced phase IV beat-to-beat BP responses to Valsalva maneuver (VM); a poor heart rate response to deep breathing; a reduced quantitative sudomotor axon reflex test (QSART) response in distal leg and foot; the highest CASS among the 3 groups; and reduced conduction velocity and amplitude in post-tibial nerve and sural nerve. The mild group had a mild reduction in BP during phase IIe and an absent phase III but normal phase IV overshoot during VM; a reduced QSART in the foot; a CASS between the moderate and slight groups; and reduced conduction velocity and amplitude in post-tibial nerve and reduced amplitude in sural nerve. The slight pain group had no abnormalities except for mild cardiovagal dysfunction. CASS gathered from all cases had a significant correlation with amplitude of sural nerve. These results suggest that the patients with symmetric sensory diabetic neuropathy may also have autonomic dysfunction, although they did not have any obvious autonomic symptoms, and that abnormalities in autonomic function parallel changes in somatic function in peripheral nerve. The CASS may be a sensitive tool, similar to the neurophysiologic test, for assessing diabetic neuropathy.
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Kihara, M., Mitsui, M., Nishikawa, S. et al. Comparison of electrophysiologic and autonomic tests in sensory diabetic neuropathy. Clinical Autonomic Research 8, 213–220 (1998). https://doi.org/10.1007/BF02267784
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DOI: https://doi.org/10.1007/BF02267784