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Kuroiwa, Ryota; Shibuya, Kazumoto; Inagaki, Takeshi; Nara, Takeru; Nemoto, Marie; Doi, Yuka; Yasuda, Manato; Uzawa, Akiyuki; Shiko, Yuki; Murata, Atsushi; Yamanaka, Yoshitaka; Kuwabara, Satoshi
Neuromuscular disorders, August 2024, 2024-08-00, 20240801, Volume: 41Journal Article
•The cough peak flow measurement has high measurement reliability in patients with myasthenia gravis (MG) before and after immunotherapy.•Cough peak flow measurement is correlated with respiratory function and MG symptoms.•Cough peak flow measurement is a useful self-monitoring tool for MG symptoms. Decreased cough strength in myasthenia gravis (MG) leads to aspiration and increases the risk of MG crisis. The aim of this study was to clarify the reliability and validity of cough peak flow (CPF) measurements in MG. A total of 26 patients with MG who underwent CPF measurements using the peak flow meter by themselves were included. MG symptoms were evaluated by pulmonary function tests and clinical MG assessment scales before and after immune-treatments. The relationship between CPF and pulmonary function tests and MG comprehensive were assessed. The cut-off value of CPF for aspiration risk was determined and the area under the curve (AUC) was calculated. The intraclass correlation coefficient was more than 0.95 for pre-and post-treatment. Positive correlations were found between CPF and almost all spirometric values as well as between the differences of pre-and post-treatment in CPF and quantitative myasthenia gravis score. The CPF for identifying the aspiration risk was used to calculate the CPF cut-off value of 205 L/min with a sensitivity of 0.77, specificity of 0.90, and AUC of 0.85. The CPF, a convenient measure by patients themselves, has a high reliability in patients with MG, and is a useful biomarker reflecting MG symptoms.
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