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  • Title: Correlation of single-breath count test and neck flexor muscle strength with spirometry in myasthenia gravis.
    Author: Elsheikh B, Arnold WD, Gharibshahi S, Reynolds J, Freimer M, Kissel JT.
    Journal: Muscle Nerve; 2016 Jan; 53(1):134-6. PubMed ID: 26437790.
    Abstract:
    INTRODUCTION: Although formal spirometry is the gold standard for monitoring respiratory function in patients with myasthenia gravis (MG), such testing is often delayed or unavailable. There is a need for a simple bedside test that can accurately measure respiratory function. METHODS: We conducted a prospective, cross-sectional, single-blind study in adults with acetylcholine receptor antibody positive MG. Participants performed the single breath count test (SBCT) and underwent manual muscle strength testing, and a respiratory therapist performed spirometry blinded to SBCT and strength results. RESULTS: Thirty-one patients, aged 57 ± 19 years participated. SBCT showed significant correlations with forced vital capacity (FVC), negative inspiratory force, and neck flexor strength (P < 0.01). FVC showed significant correlation with neck flexor strength (P = 0.02) but no correlation with shoulder abductor strength. CONCLUSIONS: These data suggest that the SBCT and neck flexor strength testing are valuable tools for bedside assessment of respiratory function in MG patients.
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