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J Korean Soc Emerg Med > Volume 29(2); 2018 > Article
Journal of The Korean Society of Emergency Medicine 2018;29(2): 236-239.
Usefulness of phrenic nerve conduction study in early diagnosis of isolated respiratory onset amyotrophic lateral sclerosis
Dong Eun Lee1 , Donghwi Park2 , Jong Kun Kim1 , Jin-Sung Park3*
1Department of Emergency Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
2Department of Rehabilitation Medicine, Daegu Fatima Hospital, Daegu, Korea
3Department of Neurology, School of Medicine, Kyungpook National University, Kyungpook National University Chilgok Hospital, Daegu, Korea
Correspondence  Jin-Sung Park ,Tel: 053-200-2168, Fax: 053-200-2029, Email: neurojspark@gmail.com,
Received: October 23, 2017; Revised: December 10, 2017   Accepted: December 11, 2017.  Published online: April 30, 2018.
ABSTRACT
Isolated respiratory onset amyotrophic lateral sclerosis (ALS) is a rare clinical manifestation and the diagnosis can be challenging. A 72-year-old man presented with dyspnea and hypercapnia that had started 11 months earlier. A phrenic nerve study was conducted and he was diagnosed promptly with ALS with no significant time delay. The phrenic nerve study is a noninvasive and useful tool in the diagnosis of respiratory onset ALS that can be applied easily in an emergency department.
Key words: Amyotrophic lateral sclerosis; Dyspnea; Fasciculation; Phrenic nerve study
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