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Ma J, Zhang H, Pang X, Zhang J, Zhao R, Wang J, Chang X, Guo J, Zhang W. Diaphragmatic ultrasonography as a predictor of respiratory muscle fatigue in myasthenia gravis. Muscle Nerve 2024; 69:199-205. [PMID: 38124677 DOI: 10.1002/mus.28020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 11/29/2023] [Accepted: 12/10/2023] [Indexed: 12/23/2023]
Abstract
INTRODUCTION/AIMS Easy fatigability, the clinical hallmark of generalized myasthenia gravis (GMG), cannot be detected in a dynamic way. The aim of this study was to assess respiratory function dynamically through diaphragmatic ultrasonography (DUS) in GMG patients. METHODS GMG patients and controls were recruited in a 1:1 ratio. DUS was performed during one quiet breath and 15 consecutive deep breaths. The diaphragm thicknesses were measured at different positions. Diaphragm thickening fraction (TFdi) and the maximal change in diaphragm thickness (Tmax) during 15 consecutive deep breaths were calculated and transformed to normality, named N-TFdi and N-Tmax, respectively. The percentages of changes in TFdi and Tmax compared with baseline were named ΔTFdi and ΔTmax, respectively. The diagnostic parameter for respiratory muscle fatigue was chosen from ΔTFdi and ΔTmax at different deep breath times according to their ability to distinguish GMG patients from controls and the interrater reliability of TFdi and Tmax. RESULTS Thirty-four GMG patients and 30 healthy controls were enrolled. N-TFdi and N-Tmax significantly changed as the number of deep breaths increased (p < .001) in GMG patients, but not in controls. ΔTmax of the 15th deep breath (ΔTmax15) was selected as the diagnostic parameter for respiratory muscle fatigue. There were no significant differences in percentage of predicted values of forced vital capacity and arterial partial pressure of carbon dioxide between patients with normal and abnormal ΔTmax15. DISCUSSION DUS could identify diaphragm fatiguability in GMG patients, which may be more reliable and sensitive in assessment of diaphragm fatigue than conventional methods.
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Affiliation(s)
- Jing Ma
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
- First Clinical Medical College, Shanxi Medical University, Taiyuan, China
| | - Huiqiu Zhang
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
- First Clinical Medical College, Shanxi Medical University, Taiyuan, China
| | - Xiaomin Pang
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
| | - Jing Zhang
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
| | - Rongjuan Zhao
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
| | - Juan Wang
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
| | - Xueli Chang
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
| | - Junhong Guo
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
| | - Wei Zhang
- Department of Neurology, First Hospital of Shanxi Medical University, Taiyuan, China
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Spiliopoulos KC, Lykouras D, Veltsista D, Skaramagkas V, Karkoulias K, Tzouvelekis A, Chroni E. The utility of diaphragm ultrasound thickening indices for assessing respiratory decompensation in amyotrophic lateral sclerosis. Muscle Nerve 2023; 68:850-856. [PMID: 37814924 DOI: 10.1002/mus.27980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 09/25/2023] [Accepted: 09/25/2023] [Indexed: 10/11/2023]
Abstract
INTRODUCTION/AIMS Amyotrophic lateral sclerosis (ALS) leads to diaphragmatic weakness at some point during its course, which is a major cause of respiratory insufficiency. The aim of this study was to evaluate ultrasound-based measures for assessing the diaphragmatic competency and the need for ventilatory support. METHODS Twenty-six subjects with ALS and 12 healthy controls were enrolled. All participants underwent B-mode diaphragm ultrasound (DUS). Diaphragm thickness and thickening indices were recorded. In the subjects with ALS, further assessments included functional scales and spirometry. We investigated the diagnostic accuracy of DUS thickening indices in predicting diaphragmatic dysfunction and the correlation between clinical, spirometric, and DUS data. RESULTS Significant relationships were found between forced vital capacity and all diaphragmatic thickening indices. Similarly, all diaphragmatic thickening indices correlated with both Milano Torino staging and disease progression rate. Only thickening fraction (TFdi) correlated with score on the revised ALS Functional Rating Scale (r = 0.459, P = .024). TFdi had better accuracy in predicting diaphragmatic dysfunction (area under the curve [AUC] = 0.839, 95% confidence interval [CI] 0.643 to 0.953) and the need for initiation of noninvasive ventilation (NIV) (AUC = 0.989, 95% CI 0.847 to 1.000) compared with the other indices. A TFdi cut-off point of 0.50 was a sensitive threshold to consider NIV. DISCUSSION DUS successfully identifies diaphragmatic dysfunction in ALS, being a valuable accessory modality for investigating respiratory symptoms. TFdi was found to be the most useful DUS index, which encourages further investigation.
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Affiliation(s)
| | - Dimosthenis Lykouras
- Department of Respiratory Medicine, University Hospital of Patras, Patras, Greece
| | - Dimitra Veltsista
- Department of Neurology, School of Medicine, University of Patras, Patras, Greece
| | - Vasileios Skaramagkas
- Institute of Computer Science, Foundation for Research and Technology Hellas, Heraklion, Greece
- Department of Electrical and Computer Engineering, Hellenic Mediterranean University, Heraklion, Greece
| | - Kiriakos Karkoulias
- Department of Respiratory Medicine, University Hospital of Patras, Patras, Greece
| | - Argyrios Tzouvelekis
- Department of Respiratory Medicine, University Hospital of Patras, Patras, Greece
| | - Elisabeth Chroni
- Department of Neurology, School of Medicine, University of Patras, Patras, Greece
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Bernardinello N, Cocconcelli E, Boscolo A, Castelli G, Sella N, Giraudo C, Zanatta E, Rea F, Saetta M, Navalesi P, Spagnolo P, Balestro E. Prevalence of diaphragm dysfunction in patients with interstitial lung disease (ILD): The role of diaphragmatic ultrasound. Respir Med 2023:107293. [PMID: 37271302 DOI: 10.1016/j.rmed.2023.107293] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Revised: 03/24/2023] [Accepted: 05/22/2023] [Indexed: 06/06/2023]
Abstract
BACKGROUND Diaphragm ultrasound (DUS) has been extensively used in critically ill patients while data on outpatients with interstitial lung disease (ILD) are limited. We hypothesized that diaphragm function, assessed by ultrasound, could be impaired in patients with ILD, considering both Idiopathic Pulmonary Fibrosis (IPF) and Connective Tissue Disease (CTD-ILD), compared to healthy subjects. Moreover, this impairment could impact clinical and functional parameters. METHODS All consecutive CTD-ILD and IPF patients followed in our center (March-October 2020) were screened. Diaphragm displacement (DD), inspiratory thickness (Ti), expiratory thickness (Te), thickening fraction (TF), and respiratory functional parameters were collected. The prevalence of diaphragmatic dysfunction (TF <30%) was then recorded. RESULTS Eighty-two consecutive patients (41 CTD-ILD, 41 IPF) and 15 age- and sex-matched controls were enrolled. In the overall population, 24 out of 82 (29%) presented diaphragmatic dysfunction. In CTD-ILD, DD and Ti were lower as compared to IPF (p = 0.021 and p = 0.036, respectively); while diaphragmatic dysfunction was more prevalent compared to controls (37% vs 7%, p = 0.043). TF positively correlated to patients' functional parameters in the CTD-ILD group (FVC%pred: p = 0.003; r = 0.45), while not in the IPF group. Diaphragmatic dysfunction was associated with moderate/severe dyspnea in both CTD-ILD and IPF (p = 0.021). CONCLUSION The prevalence of diaphragmatic dysfunction was 29% in patients with ILD and was associated with moderate/severe dyspnea. CTD-ILD presented lower DD compared with IPF and a higher prevalence of diaphragmatic dysfunction (TF<30%) compared with controls. TF was associated with lung function only in CTD-ILD patients, suggesting its potential role in the comprehensive patient assessment.
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Affiliation(s)
- Nicol Bernardinello
- Respiratory Disease Unit, Department of Cardiac, Thoracic, Vascular Sciences, And Public Health, University of Padova and Padova City Hospital, Padova, Italy
| | - Elisabetta Cocconcelli
- Respiratory Disease Unit, Department of Cardiac, Thoracic, Vascular Sciences, And Public Health, University of Padova and Padova City Hospital, Padova, Italy
| | - Annalisa Boscolo
- Institute of Anesthesia and Intensive Care, Padua University Hospital, Italy; Department of Medicine (DIMED), University of Padua, Italy
| | - Gioele Castelli
- Respiratory Disease Unit, Department of Cardiac, Thoracic, Vascular Sciences, And Public Health, University of Padova and Padova City Hospital, Padova, Italy
| | - Nicolò Sella
- Institute of Anesthesia and Intensive Care, Padua University Hospital, Italy
| | - Chiara Giraudo
- Department of Medicine (DIMED), University of Padua, Italy
| | - Elisabetta Zanatta
- Rheumatology Division, Department of Medicine (DIMED), University of Padua, Padua, Italy
| | - Federico Rea
- Thoracic Surgery and Lung Transplant Unit, Department of Cardiac, Thoracic, Vascular Sciences, and Public Health, University of Padua, Padua, Italy
| | - Marina Saetta
- Respiratory Disease Unit, Department of Cardiac, Thoracic, Vascular Sciences, And Public Health, University of Padova and Padova City Hospital, Padova, Italy
| | - Paolo Navalesi
- Institute of Anesthesia and Intensive Care, Padua University Hospital, Italy; Department of Medicine (DIMED), University of Padua, Italy
| | - Paolo Spagnolo
- Respiratory Disease Unit, Department of Cardiac, Thoracic, Vascular Sciences, And Public Health, University of Padova and Padova City Hospital, Padova, Italy
| | - Elisabetta Balestro
- Respiratory Disease Unit, Department of Cardiac, Thoracic, Vascular Sciences, And Public Health, University of Padova and Padova City Hospital, Padova, Italy.
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