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Journal Article
Review
Nodal Conduction Block and Internodal Conduction Block in Nodopathy.
Journal of Clinical Neuromuscular Disease 2024 March 2
OBJECTIVES: In 2015, a new term "nodopathy" was introduced to represent a group of neuropathy because of autoantibodies at the node of Ranvier and paranodal area. This review was conducted to highlight the electrophysiologic characteristics of acute and chronic nodopathies by the newly introduced term: "nodal conduction block (CB); CB without temporal dispersion or slow nerve conduction velocity" and by introducing a new term: "internodal CB; CB with temporal dispersion or/and slow nerve conduction velocity".
METHODS: Through PubMed searches, 23 cases of acute (<4 weeks of neuropathy) nodopathy and 12 cases of chronic (>4 weeks of neuropathy) nodopathy are identified. Two other required inclusion criteria are positive nodal antibody test and detailed nerve conduction data with or without figure. All existing data were analyzed to see whether these cases had nodal or internodal CB.
RESULTS: Among 23 cases of acute nodopathy, 11 had nodal CB, 9 internodal CB, and 3 mixed CB. Thus, nodal CB was observed in 61% of acute nodopathy cases and internodal CB in 52% of acute nodopathy cases. Among 12 cases of chronic nodopathy, all 12 had internodal CB.
CONCLUSIONS: Nodal CB is the nerve conduction characteristic of acute nodopathy, but internodal CB does not rule out acute nodopathy. Internodal CB is the nerve conduction characteristic of chronic nodopathy.
METHODS: Through PubMed searches, 23 cases of acute (<4 weeks of neuropathy) nodopathy and 12 cases of chronic (>4 weeks of neuropathy) nodopathy are identified. Two other required inclusion criteria are positive nodal antibody test and detailed nerve conduction data with or without figure. All existing data were analyzed to see whether these cases had nodal or internodal CB.
RESULTS: Among 23 cases of acute nodopathy, 11 had nodal CB, 9 internodal CB, and 3 mixed CB. Thus, nodal CB was observed in 61% of acute nodopathy cases and internodal CB in 52% of acute nodopathy cases. Among 12 cases of chronic nodopathy, all 12 had internodal CB.
CONCLUSIONS: Nodal CB is the nerve conduction characteristic of acute nodopathy, but internodal CB does not rule out acute nodopathy. Internodal CB is the nerve conduction characteristic of chronic nodopathy.
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