Abstract

Myasthenia gravis (MG) is a chronic neuromuscular disease that leads to progressive weakness, fatigue of the skeletal muscles, and is often associated with psychological changes, especially with poorer quality of sleep. To evaluate the quality of sleep in patients suffering from MG in relation to sociodemographic and clinical characteristics of the disease. A total of 70 adult patients have been classified according to Myasthenia Gravis Foundation of America classification and divided into groups with regard to the age of onset, gender, employment status and type of work, presence or absence of pathological changes on thymus and presence or absence of anti-nAchr antibodies. Severity of clinical manifestations was evaluated by using quantitative MG scores and MG composite scores. Pittsburgh questionnaire was used to assess the subjective quality of sleep. In addition, Hamilton's anxiety and depression scales and questionnaires for quality of life assessment were also implemented. The results of our research show a correlation between poor quality of sleep and prolonged duration of the disease, pathological changes on thymus, positive anti-nAchr antibodies. The correlation between poor quality of sleep with more severe clinical presentation, poor quality of life, anxiety and depression was confirmed. Quality of sleep is impaired in patients with MG, especially in the case of severe clinical manifestations and prolonged duration of the disease. Considering the lack of literature on the subject, a better understanding of the prevalence and severity of sleep disorders in MG requires further research.

Highlights

  • Myasthenia gravis (MG) is a chronic neuromuscular disease that causes a disturbance in transmission of nerve impulses to the muscles, which leads to progressive weakness and fatigue of the skeletal musculature [1]

  • In accordance with the aim of the study, the results show the correlation between poor quality of sleep and severity of clinical manifestation in MG, prolonged duration of the disease, pathological changes on thymus, the presence of positive anti-nAchr antibodies, poor quality of life and the presence of anxiety and depressive symptomatology in patients with MG

  • The link between pathological changes on thymus and the presence of positive anti-nAchr antibodies with poor quality of sleep was demonstrated

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Summary

Introduction

Myasthenia gravis (MG) is a chronic neuromuscular disease that causes a disturbance in transmission of nerve impulses to the muscles, which leads to progressive weakness and fatigue of the skeletal musculature [1]. In Serbia, prevalence is 188.8 out of 1,000,000 persons, which is one of the highest prevalence reported worldwide [3]. It can occur at any age and is more frequent in women (1.3:1) [3]. Weakness of the intercostal and diaphragmatic muscles leads to the development of dyspnea at rest and sleep disordered breathing (SDB) [5]. The prevalence of SDB among patients with MG ranges up to 60%, and for OSA is 21.1% [7]. Symptoms of breathing disorders develop gradually; they are often unrecognized by patients and are a major cause of mortality in patients with neuromuscular diseases [5, 8]. Previous research found a correlation between severity of clinical presentation of MG, accompanied with difficulties in performing daily activities, with poorer quality of life [9, 10]

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