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Distubed neuromuscular transmission in viral infections
Abstract:
14 subjects with influenza or echovirus infection, all suffering myalgia, and 9 subjects with mumps, in whom this symptom was lacking, were investigated with single fibre electromyography (EMG) in the acute phase and during convalescence to reveal a possible disturbance in neuromuscular transmission. In both groups about the same percentage of the potential pairs studied showed abnormal transmission characteristics in the acute phase. Two weeks after the acute infection, this percentage had decreased significantly in the group with myalgia, whilst in the non-myalgia group it was still at the same level. However, on both occasions of investigation and in both groups the percentages were substantially greater than those recorded in healthy individuals. This study demonstrates that acute febrile infections may adversely affect neuromuscular transmission in previously healthy human subjects. The effects observed might offer an explanation to the accentuated muscular weakness in association with infections in patients with an already low safety margion of neuromuscular transmission, e.g. in myasthenia gravis.
Insights
Acute febrile infections like influenza can disrupt neuromuscular transmission, causing muscle weakness. This effect is more pronounced in individuals with myalgia (muscle pain) and may exacerbate conditions like myasthenia gravis.
Area of Science:
- Neurology
- Infectious Diseases
- Electromyography
Background:
- Muscle pain (myalgia) is a common symptom during acute febrile infections.
- The impact of such infections on neuromuscular transmission is not fully understood.
- Previous research suggests potential links between infections and neurological symptoms.
Purpose of the Study:
- To investigate potential disturbances in neuromuscular transmission during acute febrile infections.
- To compare neuromuscular transmission in patients with and without myalgia.
- To assess changes in neuromuscular transmission during convalescence.
Main Methods:
- Single fiber electromyography (EMG) was used to assess neuromuscular transmission.
- 14 subjects with influenza or echovirus infection (with myalgia) and 9 subjects with mumps (without myalgia) were studied.
- Electromyography was performed during the acute phase and convalescence.
Main Results:
- Abnormal neuromuscular transmission characteristics were observed in both infected groups during the acute phase.
- In the myalgia group, abnormal transmission significantly decreased by convalescence.
- In the non-myalgia group, abnormal transmission remained elevated compared to healthy individuals.
Conclusions:
- Acute febrile infections can adversely affect neuromuscular transmission in healthy individuals.
- The observed effects may explain increased muscular weakness in patients with pre-existing neuromuscular transmission issues, such as myasthenia gravis.
- Myalgia may be associated with a different recovery pattern of neuromuscular function post-infection.