Assessment of respiratory muscle weakness is important at all stages of myasthenia gravis. The maximal voluntary ventilation (MVV) is an objective dynamic method for measuring the working capacity of respiratory muscles. The clinical value of this method was studied in 24 newly diagnosed patients with myasthenia gravis, classified according to Osserman criteria (grades I, IIa, and IIb). The MVV values were normal in group I, whereas a characteristic "myasthenic pattern" of decremental respiratory volumes was demonstrated during MVV in group IIa and IIb patients, with or without dyspnea. Despite some limitations and lack of specificity, MVV may be a valuable tool in the assessment of respiratory dysfunction in patients with myasthenia gravis. Muscle Nerve, 27: 715-719, 2003
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