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Electroneurographic investigations of misonidazole polyneuropathy
Abstract:
13 patients with malignant tumors were treated by the radiosensitizer misonidazole (Ro 07-0582), total dosage 20-29 g. The electrophysiological investigations showed (1) an early increase of distal latency, the motor nerve conduction velocity (NCV) of the peroneal nerve and the NCV of the sural nerve remaining normal or only signlty reduced, and in a few cases a marked reduction of the compound action potential or of the nerve action potential (NAP), indicating a primary axonal neuropathy; (2) greater changes in the parameters of sensory nerves (n. suralis) than of motor nerves; (3) the distal latency is a good indicator of subclinical neuropathies; (4) the electrophysiological parameters showed a normalization 6 months after the end of therapy. The mechanisms possibly responsible for the misonidazole neuropathy are discussed.
Insights
Misonidazole treatment for malignant tumors can cause early signs of neuropathy, particularly affecting sensory nerves. Electrophysiological tests revealed temporary nerve damage that normalized six months post-therapy.
Area of Science:
- Neuroscience
- Oncology
- Pharmacology
Background:
- Malignant tumors require effective treatment strategies.
- Radiosensitizers like misonidazole enhance radiation therapy efficacy.
- Potential neurotoxicity of misonidazole requires investigation.
Purpose of the Study:
- To investigate the electrophysiological effects of misonidazole on peripheral nerves in cancer patients.
- To identify early indicators of misonidazole-induced neuropathy.
- To assess the reversibility of neurotoxic effects.
Main Methods:
- Electrophysiological studies were conducted on 13 patients with malignant tumors treated with misonidazole (20-29 g total dosage).
- Nerve conduction velocity (NCV) of peroneal and sural nerves, distal latency, and nerve action potentials (NAP) were assessed.
- Changes were monitored during and after misonidazole therapy.
Main Results:
- Early increase in distal latency was observed, indicating subclinical neuropathy.
- Sensory nerves (sural) showed greater electrophysiological changes than motor nerves.
- A primary axonal neuropathy was suggested by reduced compound action potentials or NAP in some cases.
- Electrophysiological parameters normalized approximately 6 months after therapy cessation.
Conclusions:
- Misonidazole can induce a reversible peripheral neuropathy, primarily affecting sensory nerves.
- Distal latency is a sensitive marker for detecting subclinical misonidazole-induced neuropathy.
- Further research into the mechanisms of misonidazole neurotoxicity is warranted.