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Correlation between serum myoglobin and thyroid status in myasthenia gravis
Journal of Neurology, Neurosurgery, and Psychiatry
|December 1, 1981
Summary
Serum myoglobin levels in myasthenia gravis patients inversely correlate with thyroid hormones. High myoglobin may indicate underlying hypothyroidism in myasthenia gravis patients.
Area of Science:
- Endocrinology
- Neurology
- Clinical Biochemistry
Background:
- Myasthenia gravis is an autoimmune disorder affecting neuromuscular junctions.
- Thyroid dysfunction is common and can influence muscle function.
- Myoglobin is a muscle protein whose levels can be affected by various conditions.
Purpose of the Study:
- To investigate the relationship between serum myoglobin and thyroid hormone levels in myasthenia gravis patients.
- To determine if thyroid status influences myoglobin concentrations in this population.
Main Methods:
- Serum samples were collected from 52 patients diagnosed with myasthenia gravis.
- Serum myoglobin, thyroxine (T4), and triiodothyronine (T3) levels were measured.
- Correlations between myoglobin and thyroid hormone levels were analyzed.
Main Results:
- A significant inverse correlation was observed between serum myoglobin and circulating thyroxine and triiodothyronine levels.
- The highest myoglobin concentration (240 ng/ml) was found in a patient with coexisting hypothyroidism.
- Slightly elevated myoglobin levels (54-60 ng/ml) were noted in four euthyroid myasthenia gravis patients.
Conclusions:
- Elevated serum myoglobin in myasthenia gravis patients may suggest an underlying hypothyroid state.
- Thyroid function should be assessed in myasthenia gravis patients presenting with high myoglobin levels.
- This finding highlights the importance of excluding hypothyroidism in the clinical management of myasthenia gravis.