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Khan A, Frazer-Green L, Amin R, Wolfe L, Faulkner G, Casey K, Sharma G, Selim B, Zielinski D, Aboussouan LS, McKim D, Gay P. Respiratory Management of Patients With Neuromuscular Weakness: An American College of Chest Physicians Clinical Practice Guideline and Expert Panel Report. Chest 2023; 164:394-413. [PMID: 36921894 DOI: 10.1016/j.chest.2023.03.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 02/27/2023] [Accepted: 03/05/2023] [Indexed: 03/14/2023] Open
Abstract
BACKGROUND Respiratory failure is a significant concern in neuromuscular diseases (NMDs). This CHEST guideline examines the literature on the respiratory management of patients with NMD to provide evidence-based recommendations. STUDY DESIGN AND METHODS An expert panel conducted a systematic review addressing the respiratory management of NMD and applied the Grading of Recommendations, Assessment, Development, and Evaluations approach for assessing the certainty of the evidence and formulating and grading recommendations. A modified Delphi technique was used to reach a consensus on the recommendations. RESULTS Based on 128 studies, the panel generated 15 graded recommendations, one good practice statement, and one consensus-based statement. INTERPRETATION Evidence of best practices for respiratory management in NMD is limited and is based primarily on observational data in amyotrophic lateral sclerosis. The panel found that pulmonary function testing every 6 months may be beneficial and may be used to initiate noninvasive ventilation (NIV) when clinically indicated. An individualized approach to NIV settings may benefit patients with chronic respiratory failure and sleep-disordered breathing related to NMD. When resources allow, polysomnography or overnight oximetry can help to guide the initiation of NIV. The panel provided guidelines for mouthpiece ventilation, transition to home mechanical ventilation, salivary secretion management, and airway clearance therapies. The guideline panel emphasizes that NMD pathologic characteristics represent a diverse group of disorders with differing rates of decline in lung function. The clinician's role is to add evaluation at the bedside to shared decision-making with patients and families, including respect for patient preferences and treatment goals, considerations of quality of life, and appropriate use of available resources in decision-making.
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Affiliation(s)
- Akram Khan
- Division of Pulmonary Allergy and Critical Care Medicine, Oregon Health and Science University, Portland, OR.
| | | | - Reshma Amin
- Department of Respiratory Medicine, The Hospital for Sick Kids, Toronto
| | - Lisa Wolfe
- Department of Medicine, Northwestern University, Chicago, IL
| | | | - Kenneth Casey
- Department of Sleep Medicine, William S. Middleton Memorial Veterans Hospital, Shorewood Hills, WI
| | - Girish Sharma
- Department of Pediatrics, Rush University Medical Center, Chicago, IL
| | - Bernardo Selim
- Department of Pulmonary Medicine, Mayo Clinic, Rochester, MN
| | - David Zielinski
- Department of Pediatrics, McGill University, Montreal, QC, Canada
| | | | - Douglas McKim
- Department of Medicine, The Ottawa Hospital Research Institute, Ottawa, ON
| | - Peter Gay
- Department of Pulmonary Medicine, Mayo Clinic, Rochester, MN
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2
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Kikuchi K, Satake M, Furukawa Y, Terui Y. Assessment of body composition, metabolism, and pulmonary function in patients with myotonic dystrophy type 1. Medicine (Baltimore) 2022; 101:e30412. [PMID: 36086756 PMCID: PMC10980380 DOI: 10.1097/md.0000000000030153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 07/05/2022] [Indexed: 11/25/2022] Open
Abstract
Abnormal body composition in myotonic dystrophy type 1 (DM1) are affected by energy intake above resting energy expenditure (REE). We aim to investigate the characteristics and relationship between body composition, REE, and pulmonary function in patients with DM1, and to examine their changes in 1 year. The study design was a single-center, cross-sectional, and longitudinal study of body composition, REE characteristics, and pulmonary function. Twenty-one male patients with DM1 and 16 healthy volunteers were registered in the study. Body composition was measured using dual-energy X-ray absorptiometry (DEXA). Fat mass (FM) index (kg/m2), fat-FM index (kg/m2), and skeletal mass index (kg/m2) were calculated. The measurements were taken breath by breath with a portable indirect calorimeter. The REE was calculated using the oxygen intake (VO2) and carbon dioxide output (VCO2) in the Weir equation. Basal energy expenditure (BEE) was calculated by substituting height, weight, and age into the Harris-Benedict equation. The study enrolled male patients with DM1 (n = 12) and healthy male volunteers (n = 16). Patients with DM1 (n = 7) and healthy volunteers (n = 14) could be followed in 1 year. The body composition of patients with DM1 was significantly higher in the FM index and significantly lower in the fat-FM index and skeletal mass index. The REE of patients with DM1 was significantly lower and was not associated with body composition. Patients with DM1 had poor metabolism that was not related to body composition. FM was high and lean body mass was low.
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Affiliation(s)
- Kazuto Kikuchi
- Department of Physical Therapy, Akita Rehabilitation College, Akita, Japan
| | - Masahiro Satake
- Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita, Japan
| | - Yutaka Furukawa
- Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita, Japan
| | - Yoshino Terui
- Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita, Japan
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3
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Mateus T, Costa A, Viegas D, Marques A, Herdeiro MT, Rebelo S. Outcome measures frequently used to assess muscle strength in patients with myotonic dystrophy type 1: a systematic review. Neuromuscul Disord 2021; 32:99-115. [PMID: 35031191 DOI: 10.1016/j.nmd.2021.09.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 09/29/2021] [Accepted: 09/30/2021] [Indexed: 10/20/2022]
Abstract
Measurement of muscle strength is fundamental for the management of patients with myotonic dystrophy type 1 (DM1). Nevertheless, guidance on this topic is somewhat limited due to heterogeneous outcome measures used. This systematic literature review aimed to summarize the most frequent outcome measures to assess muscle strength in patients with DM1. We searched on Pubmed, Web of Science and Embase databases. Observational studies using measures of muscle strength assessment in adult patients with DM1 were included. From a total of 80 included studies, 24 measured cardiac, 45 skeletal and 23 respiratory muscle strength. The most common method and outcome measures used to assess cardiac muscle strength were echocardiography and ejection fraction, for skeletal muscle strength were quantitative muscle test, manual muscle test and maximum isometric torque and medical research council and for respiratory muscle strength were manometry and maximal inspiratory and expiratory pressure. We successfully gathered the more consensual methods and measures to evaluate muscle strength in future clinical studies, particularly to test muscle strength response to treatments in patients with DM1. Future consensus on a set of measures to evaluate muscle strength (core outcome set), is important for these patients.
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Affiliation(s)
- Tiago Mateus
- Department of Medical Sciences, Institute of Biomedicine (iBiMED), University of Aveiro, Aveiro 3810-193, Portugal
| | - Adriana Costa
- Department of Medical Sciences, Institute of Biomedicine (iBiMED), University of Aveiro, Aveiro 3810-193, Portugal
| | - Diana Viegas
- Department of Medical Sciences, Institute of Biomedicine (iBiMED), University of Aveiro, Aveiro 3810-193, Portugal
| | - Alda Marques
- Respiratory Research and Rehabilitation Laboratory - Lab3R, Institute of Biomedicine (iBiMED), School of Health Sciences (ESSUA), University of Aveiro, Aveiro, Portugal
| | - Maria Teresa Herdeiro
- Department of Medical Sciences, Institute of Biomedicine (iBiMED), University of Aveiro, Aveiro 3810-193, Portugal
| | - Sandra Rebelo
- Department of Medical Sciences, Institute of Biomedicine (iBiMED), University of Aveiro, Aveiro 3810-193, Portugal.
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4
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Hartog L, Zhao J, Reynolds J, Brokamp G, Vilson F, Arnold WD, LoRusso S. Factors Influencing the Severity and Progression of Respiratory Muscle Dysfunction in Myotonic Dystrophy Type 1. Front Neurol 2021; 12:658532. [PMID: 33927684 PMCID: PMC8076608 DOI: 10.3389/fneur.2021.658532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 03/18/2021] [Indexed: 11/13/2022] Open
Abstract
Respiratory complications are the most common cause of death among patients with Myotonic Dystrophy type 1 (DM1), but the natural history of respiratory decline in DM1 patients is incompletely characterized and few predictors of the progression of respiratory dysfunction have been identified. To identify factors influencing the progression of respiratory dysfunction electronic medical records from 110 adult patients diagnosed with DM1 were reviewed along with data for respiratory symptoms and pulmonary function obtained from routine respiratory therapist clinical evaluations. At baseline, 70.9% had evidence of restrictive respiratory impairment. We examined various parameters of respiratory functional status, and found FVC (% predicted) correlated best with other measures of disease severity. Annual change in FVC was −1.42 (std error = 0.381). Greater CTG repeat size, higher MIRS rating, and longer disease duration were all correlated with lower baseline FVC but not with annual rate of change. Wide variability in clinical phenotype made determination of disease measures directly related to respiratory functional decline challenging.
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Affiliation(s)
- Leigh Hartog
- Department of Neurology, The Ohio State University College of Medicine, Columbus, OH, United States
| | - Jing Zhao
- Department of Biomedical Informatics, The Ohio State University College of Medicine, Columbus, OH, United States
| | - Jerry Reynolds
- Department of Neurology, Ohio State University Medical Center, Columbus, OH, United States
| | - Gabrielle Brokamp
- Department of Neurology, The Ohio State University College of Medicine, Columbus, OH, United States
| | - Ferdinand Vilson
- Department of Neurology, The Ohio State University College of Medicine, Columbus, OH, United States
| | - W David Arnold
- Department of Neurology, Ohio State University Medical Center, Columbus, OH, United States
| | - Samantha LoRusso
- Department of Neurology, Ohio State University Medical Center, Columbus, OH, United States
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5
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Subramony SH, Wymer JP, Pinto BS, Wang ET. Sleep disorders in myotonic dystrophies. Muscle Nerve 2020; 62:309-320. [DOI: 10.1002/mus.26866] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 03/15/2020] [Accepted: 03/16/2020] [Indexed: 12/25/2022]
Affiliation(s)
- Sub H. Subramony
- Department of NeurologyUniversity of Florida College of Medicine, McKnight Brain Institute Gainesville Florida
| | - James P. Wymer
- Department of NeurologyUniversity of Florida College of Medicine, McKnight Brain Institute Gainesville Florida
| | - Belinda S. Pinto
- Department of Molecular Genetics & Microbiology, Center for NeuroGenetics, UF Genetics InstituteUniversity of Florida College of Medicine Gainesville Florida
| | - Eric T. Wang
- Department of Molecular Genetics & Microbiology, Center for NeuroGenetics, UF Genetics InstituteUniversity of Florida College of Medicine Gainesville Florida
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Kohno G, Ogawa K, Kushimoto M, Tanaka S, Ikeda J, Nishizawa T, Mitsuke K, Nakayama T, Suzuki Y, Ishihara H, Fujishiro M. Two Adult Siblings With Myotonic Dystrophy Type 1 With Different Phenotypes Presenting With Chronic Respiratory Insufficiency and Sleep Apnea Syndrome. Front Neurol 2019; 10:681. [PMID: 31333559 PMCID: PMC6620565 DOI: 10.3389/fneur.2019.00681] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 06/11/2019] [Indexed: 11/18/2022] Open
Abstract
Myotonic dystrophy type 1 (DM1) is an autosomal dominant disease characterized by progressive muscle weakness and myotonia along with multiple organ system involvements. Overall, DM1 patients show reduced life expectancy, mainly due to respiratory or cardiac abnormalities. Chronic respiratory impairment is associated with increased morbidity in DM1. The main ventilatory dysfunction etiology in DM1 is complex, consisting of both peripheral respiratory dysfunction and central respiratory drive dysfunction as well as upper airway muscle dysfunction leading to obstructive sleep apnea syndrome (SAS) and aspiration. Advancements in early diagnosis of DM1 and management with non-invasive therapeutic tools have improved life expectancy for DM1 patients. We present herein two siblings with DM1, a thin elder brother and an obese younger sister with visceral fat accumulation. Although neither had voluntary symptoms related to respiratory dysfunction, their apnea-hypopnea indices revealed severe SAS and subsequent arterial blood gases studies showed hypercapnia as well as hypoxia, suggesting central nervous system involvement with peripheral respiratory dysfunction. Non-invasive positive pressure ventilation during sleep was started following pulmonary assessment. Respiratory function should be assessed in DM1 patients, even those free of respiratory symptoms, because respiratory muscle weakness occurs in a high percentage of these patients and will shorten their lives.
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Affiliation(s)
- Genta Kohno
- Division of Diabetes and Metabolic Diseases, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Katsuhiko Ogawa
- Department of Internal Medicine, Nihon University Hospital, Tokyo, Japan.,Division of Neurology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Masaru Kushimoto
- Department of Internal Medicine, Nihon University Hospital, Tokyo, Japan
| | - Sho Tanaka
- Department of Internal Medicine, Nihon University Hospital, Tokyo, Japan.,Division of Nephrology, Hypertension and Endocrinology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Jin Ikeda
- Department of Internal Medicine, Nihon University Hospital, Tokyo, Japan
| | - Tsukasa Nishizawa
- Division of Respiratory Medicine, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Kazutaka Mitsuke
- Division of Neurology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Tomohiro Nakayama
- Division of Laboratory Medicine, Department of Pathology and Microbiology, Nihon University School of Medicine, Tokyo, Japan
| | - Yutaka Suzuki
- Department of Internal Medicine, Nihon University Hospital, Tokyo, Japan.,Division of Neurology, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Hisamitsu Ishihara
- Division of Diabetes and Metabolic Diseases, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan
| | - Midori Fujishiro
- Division of Diabetes and Metabolic Diseases, Department of Internal Medicine, Nihon University School of Medicine, Tokyo, Japan.,Department of Internal Medicine, Nihon University Hospital, Tokyo, Japan
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7
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Prevalence and predictor factors of respiratory impairment in a large cohort of patients with Myotonic Dystrophy type 1 (DM1): A retrospective, cross sectional study. J Neurol Sci 2019; 399:118-124. [DOI: 10.1016/j.jns.2019.02.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 02/04/2019] [Accepted: 02/06/2019] [Indexed: 12/13/2022]
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8
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Sleep Complaints, Sleep and Breathing Disorders in Myotonic Dystrophy Type 2. Curr Neurol Neurosci Rep 2019; 19:9. [DOI: 10.1007/s11910-019-0924-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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9
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Hawkins AM, Hawkins CL, Abdul Razak K, Khoo TK, Tran K, Jackson RV. Respiratory dysfunction in myotonic dystrophy type 1: A systematic review. Neuromuscul Disord 2018; 29:198-212. [PMID: 30765255 DOI: 10.1016/j.nmd.2018.12.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 12/02/2018] [Accepted: 12/06/2018] [Indexed: 11/28/2022]
Abstract
Myotonic dystrophy type 1 (DM1) is one of the most common muscular dystrophies in adults. This review summarises the current literature regarding the natural history of respiratory dysfunction in DM1, the role of central respiratory drive and peripheral respiratory muscle involvement and its significance in respiratory function, and investigates the relationship between genetics (CTG repeat length) and respiratory dysfunction. The review included all articles that reported spirometry on 10 or more myotonic dystrophy patients. The final review included 55 articles between 1964 and 2017. The major conclusions of this review were (1) confirmation of the current consensus that respiratory dysfunction, predominantly a restrictive ventilatory pattern, is common in myotonic dystrophy and is associated with alveolar hypoventilation, chronic hypercapnia, and sleep disturbance in the form of sleep apnoea and sleep related disordered breathing; (2) contrary to commonly held belief, there is no consensus in the literature regarding the relationship between CTG repeat length and severity of respiratory dysfunction and a relationship has not been established; (3) the natural history and time-course of respiratory functional decline is very poorly understood in the current literature; (4) there is a consensus that there is a significant involvement of central respiratory drive in this alveolar hypoventilation however the current literature does not identify the mechanism for this.
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Affiliation(s)
- A M Hawkins
- School of Medicine, Griffith University, Gold Coast, Queensland, Australia; Department of Medicine, Logan Hospital, Meadowbrook, Queensland, Australia.
| | - C L Hawkins
- School of Medicine, University of Queensland, St Lucia, Queensland, Australia
| | - K Abdul Razak
- School of Medicine, Griffith University, Gold Coast, Queensland, Australia; Department of Medicine, Logan Hospital, Meadowbrook, Queensland, Australia
| | - T K Khoo
- School of Medicine, Griffith University, Gold Coast, Queensland, Australia; School of Medicine, University of Wollongong, New South Wales, Australia
| | - K Tran
- School of Medicine, Griffith University, Gold Coast, Queensland, Australia; School of Medicine, University of Queensland, St Lucia, Queensland, Australia; Department of Respiratory Medicine, Logan Hospital, Meadowbrook, Queensland, Australia
| | - R V Jackson
- School of Medicine, Griffith University, Gold Coast, Queensland, Australia; Department of Medicine, Logan Hospital, Meadowbrook, Queensland, Australia
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10
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Katz S, Arish N, Rokach A, Zaltzman Y, Marcus EL. The effect of body position on pulmonary function: a systematic review. BMC Pulm Med 2018; 18:159. [PMID: 30305051 PMCID: PMC6180369 DOI: 10.1186/s12890-018-0723-4] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Accepted: 09/17/2018] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Pulmonary function tests (PFTs) are routinely performed in the upright position due to measurement devices and patient comfort. This systematic review investigated the influence of body position on lung function in healthy persons and specific patient groups. METHODS A search to identify English-language papers published from 1/1998-12/2017 was conducted using MEDLINE and Google Scholar with key words: body position, lung function, lung mechanics, lung volume, position change, positioning, posture, pulmonary function testing, sitting, standing, supine, ventilation, and ventilatory change. Studies that were quasi-experimental, pre-post intervention; compared ≥2 positions, including sitting or standing; and assessed lung function in non-mechanically ventilated subjects aged ≥18 years were included. Primary outcome measures were forced expiratory volume in 1 s (FEV1), forced vital capacity (FVC, FEV1/FVC), vital capacity (VC), functional residual capacity (FRC), maximal expiratory pressure (PEmax), maximal inspiratory pressure (PImax), peak expiratory flow (PEF), total lung capacity (TLC), residual volume (RV), and diffusing capacity of the lungs for carbon monoxide (DLCO). Standing, sitting, supine, and right- and left-side lying positions were studied. RESULTS Forty-three studies met inclusion criteria. The study populations included healthy subjects (29 studies), lung disease (nine), heart disease (four), spinal cord injury (SCI, seven), neuromuscular diseases (three), and obesity (four). In most studies involving healthy subjects or patients with lung, heart, neuromuscular disease, or obesity, FEV1, FVC, FRC, PEmax, PImax, and/or PEF values were higher in more erect positions. For subjects with tetraplegic SCI, FVC and FEV1 were higher in supine vs. sitting. In healthy subjects, DLCO was higher in the supine vs. sitting, and in sitting vs. side-lying positions. In patients with chronic heart failure, the effect of position on DLCO varied. CONCLUSIONS Body position influences the results of PFTs, but the optimal position and magnitude of the benefit varies between study populations. PFTs are routinely performed in the sitting position. We recommend the supine position should be considered in addition to sitting for PFTs in patients with SCI and neuromuscular disease. When treating patients with heart, lung, SCI, neuromuscular disease, or obesity, one should take into consideration that pulmonary physiology and function are influenced by body position.
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Affiliation(s)
- Shikma Katz
- Chronic Ventilator-Dependent Division, Herzog Medical Center, POB 3900, Jerusalem, Israel
- 0000 0004 1937 0511grid.7489.2Recanati School for Community Health Professions, Faculty of Health Sciences, Ben Gurion University of the Negev, Beer Sheva, Israel
| | - Nissim Arish
- Pulmonary Institute, Shaare Zedek Medical Center, POB 3235, Jerusalem, Israel
- 0000 0004 1937 0538grid.9619.7Hebrew University-Hadassah Faculty of Medicine, Jerusalem, Israel
| | - Ariel Rokach
- Pulmonary Institute, Shaare Zedek Medical Center, POB 3235, Jerusalem, Israel
- 0000 0004 1937 0538grid.9619.7Hebrew University-Hadassah Faculty of Medicine, Jerusalem, Israel
| | - Yacov Zaltzman
- Chronic Ventilator-Dependent Division, Herzog Medical Center, POB 3900, Jerusalem, Israel
| | - Esther-Lee Marcus
- Chronic Ventilator-Dependent Division, Herzog Medical Center, POB 3900, Jerusalem, Israel
- 0000 0004 1937 0538grid.9619.7Hebrew University-Hadassah Faculty of Medicine, Jerusalem, Israel
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11
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Abstract
Myotonic dystrophy is an autosomal dominant muscular dystrophy not only associated with muscle weakness, atrophy, and myotonia but also prominent multisystem involvement. There are 2 similar, but distinct, forms of myotonic dystrophy; type 1 is caused by a CTG repeat expansion in the DMPK gene, and type 2 is caused by a CCTG repeat expansion in the CNBP gene. Type 1 is associated with distal limb, neck flexor, and bulbar weakness and results in different phenotypic subtypes with variable onset from congenital to very late-onset as well as variable signs and symptoms. The classically described adult-onset form is the most common. In contrast, myotonic dystrophy type 2 is adult-onset or late-onset, has proximal predominant muscle weakness, and generally has less severe multisystem involvement. In both forms of myotonic dystrophy, the best characterized disease mechanism is a RNA toxic gain-of-function during which RNA repeats form nuclear foci resulting in sequestration of RNA-binding proteins and, therefore, dysregulated splicing of premessenger RNA. There are currently no disease-modifying therapies, but clinical surveillance, preventative measures, and supportive treatments are used to reduce the impact of muscular impairment and other systemic involvement including cataracts, cardiac conduction abnormalities, fatigue, central nervous system dysfunction, respiratory weakness, dysphagia, and endocrine dysfunction. Exciting preclinical progress has been made in identifying a number of potential strategies including genome editing, small molecule therapeutics, and antisense oligonucleotide-based therapies to target the pathogenesis of type 1 and type 2 myotonic dystrophies at the DNA, RNA, or downstream target level.
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Affiliation(s)
- Samantha LoRusso
- Department of Neurology, The Ohio State University, 395 West 12th Avenue, Columbus, OH, 43210, USA
| | - Benjamin Weiner
- The Ohio State University College of Medicine, The Ohio State University, 370 West 9th Avenue, Columbus, OH, 43210, USA
| | - W David Arnold
- Department of Neurology, The Ohio State University, 395 West 12th Avenue, Columbus, OH, 43210, USA.
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12
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Evangelista MDA, Dias FAL, Dourado Júnior MET, do Nascimento GC, Sarmento A, Gualdi LP, Aliverti A, Resqueti V, Fregonezi GADF. Noninvasive assessment of respiratory muscle strength and activity in Myotonic dystrophy. PLoS One 2017; 12:e0177318. [PMID: 28594857 PMCID: PMC5464542 DOI: 10.1371/journal.pone.0177318] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Accepted: 04/25/2017] [Indexed: 01/06/2023] Open
Abstract
OBJECTIVE To evaluate sensitivity/specificity of the maximum relaxation rate (MRR) of inspiratory muscles, amplitude of electromyographic activity of the sternocleidomastoid (SCM), scalene (SCA), parasternal (2ndIS) and rectus abdominis (RA) muscles; lung function and respiratory muscle strength in subjects with Myotonic dystrophy type 1 (DM1) compared with healthy subjects. DESIGN AND METHODS Quasi-experimental observational study with control group. MRR of inspiratory muscles, lung function and amplitude of the electromyographic activity of SCM, SCA, 2ndIS and RA muscles during maximum inspiratory pressure (PImax), maximum expiratory pressure (PEmax) and sniff nasal inspiratory pressure (SNIP) tests were assessed in eighteen DM1 subjects and eleven healthy. RESULTS MRR was lower in DM1 group compared to healthy (P = 0.001) and was considered sensitive and specific to identify disease in DM1 and discard it in controls, as well as SNIP% (P = 0.0026), PImax% (P = 0.0077) and PEmax% (P = 0.0002). Contraction time of SCM and SCA was higher in DM1 compared to controls, respectively, during PImax (P = 0.023 and P = 0.017) and SNIP (P = 0.015 and P = .0004). The DM1 group showed lower PImax (P = .0006), PEmax (P = 0.0002), SNIP (P = 0.0014), and higher electromyographic activity of the SCM (P = 0.002) and SCA (P = 0.004) at rest; of 2ndIS (P = 0.003) during PEmax and of SCM (P = 0.02) and SCA (P = 0.03) during SNIP test. CONCLUSIONS MD1 subjects presented restrictive pattern, reduced respiratory muscle strength, muscular electrical activity and MRR when compared to higher compared to controls. In addition, the lower MRR found in MD1 subjects showed to be reliable to sensitivity and specificity in identifying the delayed relaxation of respiratory muscles.
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Affiliation(s)
- Morgana de Araújo Evangelista
- PneumoCardioVascular Lab, Departamento de Fisioterapia, Universidade Federal do Rio Grande Do Norte, Natal, Rio Grande do Norte, Brasil
- PneumoCardioVascular Lab/HUOL, Empresa Brasileira de Serviços Hospitalares (EBSERH), Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brasil
| | | | | | - George Carlos do Nascimento
- Departamento de Engenharia Biomédica, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brasil
| | - Antonio Sarmento
- PneumoCardioVascular Lab, Departamento de Fisioterapia, Universidade Federal do Rio Grande Do Norte, Natal, Rio Grande do Norte, Brasil
- PneumoCardioVascular Lab/HUOL, Empresa Brasileira de Serviços Hospitalares (EBSERH), Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brasil
| | - Lucien Peroni Gualdi
- PneumoCardioVascular Lab, Departamento de Fisioterapia, Universidade Federal do Rio Grande Do Norte, Natal, Rio Grande do Norte, Brasil
- PneumoCardioVascular Lab/HUOL, Empresa Brasileira de Serviços Hospitalares (EBSERH), Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brasil
- Faculdade de Ciências da Saúde do Trairi, Universidade Federal do Rio Grande do Norte, Santa Cruz, Rio Grande do Norte, Brasil
| | - Andrea Aliverti
- Dipartimento di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, Milan, Italy
| | - Vanessa Resqueti
- PneumoCardioVascular Lab, Departamento de Fisioterapia, Universidade Federal do Rio Grande Do Norte, Natal, Rio Grande do Norte, Brasil
- PneumoCardioVascular Lab/HUOL, Empresa Brasileira de Serviços Hospitalares (EBSERH), Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brasil
| | - Guilherme Augusto de Freitas Fregonezi
- PneumoCardioVascular Lab, Departamento de Fisioterapia, Universidade Federal do Rio Grande Do Norte, Natal, Rio Grande do Norte, Brasil
- PneumoCardioVascular Lab/HUOL, Empresa Brasileira de Serviços Hospitalares (EBSERH), Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brasil
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13
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Pfeffer G, Povitz M. Respiratory management of patients with neuromuscular disease: current perspectives. Degener Neurol Neuromuscul Dis 2016; 6:111-118. [PMID: 30050373 PMCID: PMC6053085 DOI: 10.2147/dnnd.s87323] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Neuromuscular ventilatory weakness can be difficult to recognize because the symptoms can be nocturnal, nonspecific, or attributed to other conditions. The presence of respiratory muscle weakness suggests a number of possible heterogeneous conditions, including neurodegenerative, autoimmune, and genetic neuromuscular diseases. In some conditions, disease-modifying management exists, but in the absence of such intervention, supportive respiratory therapy can improve quality of life and survival. In this review, we discuss the differential diagnosis and diagnostic approach to chronic neuromuscular respiratory weakness. We also review the clinical assessment and management of respiratory failure in these conditions.
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Affiliation(s)
- Gerald Pfeffer
- Department of Clinical Neurosciences, .,Hotchkiss Brain Institute, University of Calgary, Calgary, AB,
| | - Marcus Povitz
- Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
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Poussel M, Thil C, Kaminsky P, Mercy M, Gomez E, Chaouat A, Chabot F, Chenuel B. Lack of correlation between the ventilatory response to CO2 and lung function impairment in myotonic dystrophy patients: Evidence for a dysregulation at central level. Neuromuscul Disord 2015; 25:403-8. [DOI: 10.1016/j.nmd.2015.02.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 02/04/2015] [Accepted: 02/11/2015] [Indexed: 11/27/2022]
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Abstract
Myotonic dystrophy (dystrophia myotonica, DM) is one of the most common lethal monogenic disorders in populations of European descent. DM type 1 was first described over a century ago. More recently, a second form of the disease, DM type 2 was recognized, which results from repeat expansion in a different gene. Both disorders have autosomal dominant inheritance and multisystem features, including myotonic myopathy, cataract, and cardiac conduction disease. This article reviews the clinical presentation and pathophysiology of DM and discusses current management and future potential for developing targeted therapies.
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Affiliation(s)
- Charles A Thornton
- Department of Neurology, Center for Neural Development and Disease, Center for RNA Biology, University of Rochester Medical Center, Box 645, 601 Elmwood Avenue, Rochester, NY 14642, USA.
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