Chest wall muscle cross talk in canine  costal diaphragm electromyogram

Sinderby, Christer A.; Friberg, Sven; Comtois, Norman; Grassino, A.

doi:10.1152/jappl.1996.81.5.2312

Cited by 42 publications

(42 citation statements)

References 22 publications

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“…Thus it may be difficult to thoroughly interpret the changes in CMAP characteristics. Previous studies had reported that CMAP amplitude and latency would be affected by different lung volumes [21,22]. We assumed both groups in our study were influenced to the same extent; however, the result showing significant difference of CMAP amplitude and latency could provide important information regarding the neuromuscular characteristics of inspiratory muscles in OSA patients.…”

Section: Study Limitationsmentioning

confidence: 78%

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Inspiratory muscle dysfunction in patients with severe obstructive sleep apnoea

Chien¹,

Yt²,

Lee³

et al. 2009

European Respiratory Journal

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Repetitive inspiratory effort against an obstructed airway and intermittent hypoxia may be deleterious to the inspiratory muscles in patients with obstructive sleep apnoea (OSA).We investigated muscular dysfunction by comparing the strength, endurance and fatigability of inspiratory muscles and knee extensors in patients with newly diagnosed severe OSA compared with matched controls. The measurements included strength and endurance tests of both muscles, and a fatigue trial with simultaneous surface electromyography of the diaphragm and the vastus lateralis during voluntary contractions and in response to magnetic stimulation. To our knowledge, this is the first investigation to assess peripheral muscle performance in severe OSA patients versus controls.Patients in the OSA group exhibited significantly lower strength and endurance in both muscles than the control group. The fatigue index decreased significantly exclusively in the inspiratory muscles of OSA patients. Magnetic stimulation-evoked compound muscle action potential latencies increased and the amplitudes decreased significantly in the diaphragm, but not in the vastus lateralis after a fatigue test in the OSA group.In conclusion, a significantly lower functional performance was shown for both inspiratory muscles and knee extensors in the OSA group. However, higher fatigability was only seen in the inspiratory muscles of patients with severe OSA.

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Section: Study Limitationsmentioning

confidence: 78%

“…Use of intramuscular needle electrodes avoids cross-talk but contains disadvantages of invasiveness and sampling bias. sEMG recordings provide a popular, routine tool to investigate chest wall muscle function but can be confounded by noise and cross-talk [22]. This is a potential limitation of sEMG.…”

Section: Methodological Considerationsmentioning

confidence: 99%

Inspiratory muscle dysfunction in patients with severe obstructive sleep apnoea

Chien¹,

Yt²,

Lee³

et al. 2009

European Respiratory Journal

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“…The use of surface electromyography to record respiratory muscle activity has been criticised because of difficulties in separating postural activity of the trunk muscles from that of the breathing muscles [14]. To minimise EMG contamination from the muscles of the trunk, all measurements were performed in the relaxed, upright seated position, with the patients' arms and trunk supported.…”

Section: Discussionmentioning

confidence: 99%

Measurement of parasternal intercostal electromyogram during an infective exacerbation in patients with cystic fibrosis

et al. 2012

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The parasternal intercostal muscle electromyogram (sEMGpara) is a measure of neural respiratory drive and reflects lung disease severity in stable cystic fibrosis (CF). The aim of the study was to measure sEMGpara in acute infective exacerbations of CF and compare changes in sEMGpara with those in conventional lung function measures.12 patients with CF admitted to hospital with an acute chest infection were studied. There was a significant reduction in mean¡SD sEMGpara (DsEMGpara -38¡19%, p,0.001) between admission and discharge. Spirometery also improved significantly from admission to discharge; Dforced expiratory volume in 1 s % predicted 39¡30%, p,0.001 and Dvital capacity % pred 22¡18%, p,0.001. sEMGpara has potential value as a nonvolitional measure of change in respiratory function in CF.

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“…However, the methodology that we used for acquisition and analysis of EAdi has been validated to address these problems (33). Contamination of EAdi by nondiaphragmatic activity occurs essentially when surface recording is used (31). Esophageal measurements of EAdi are less subject to contamination because the distance between electrodes and abdominal or intercostal muscles is greater (39).…”

Section: Discussionmentioning

confidence: 99%

Diaphragm Electrical Activity During Expiration in Mechanically Ventilated Infants

et al. 2006

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ABSTRACT:The presence of diaphragm electrical activity (EAdi) during expiration is believed to be involved in the maintenance of end-expiratory lung volume (EELV) and has never been studied in intubated and mechanically ventilated infants. The aim of this study was to quantify the amplitude of diaphragm electrical activity present during expiration in mechanically ventilated infants and to measure the impact of removing positive end-expiratory pressure (PEEP) on this activity. We studied the EAdi in 16 ready-to-be weaned intubated infants who were breathing on their prescribed ventilator and PEEP settings. In all 16 patients, 5 min of data were collected on the prescribed ventilator settings. In a subset of eight patients, the PEEP was briefly reduced to zero PEEP (ZEEP). EAdi was recorded with miniaturized sensors placed on a conventional nasogastric feeding tube. Airway pressure (Paw) was also measured. For each spontaneous breath, we identified the neural inspiration and neural expiration. Neural expiration was divided into quartiles (Q1, Q2, Q3, and Q4), and the amplitude of EAdi calculated for each Q1-Q4 represented 95 Ϯ 29%, 31 Ϯ 15%, 15 Ϯ 8%, and 12 Ϯ 7%, respectively, of the inspiratory EAdi amplitude. EAdi for Q3-Q4 significantly increased during ZEEP, and decreased after reapplication of PEEP. These findings confirm that the diaphragm remains partially active during expiration in intubated and mechanically ventilated infants and that removal of PEEP affects this tonic activity. This could have potential implications on the management of PEEP in intubated infants. T he diaphragm is primarily known as an inspiratory muscle that is active during inspiration and relaxed during expiration. However, in healthy premature and full-term newborns, it has been demonstrated that electrical activity of the diaphragm, measured with electrodes on the surface of the chest wall, may persist throughout expiration, suggesting a "tonic" activity of the respiratory muscles (1-4). Lopes et al.(2) demonstrated that changes in tonic activity of the diaphragm were associated with changes in EELV and provided the original physiologic explanation that persistent diaphragmatic activity during the exhalation period helps to regulate EELV in infants . In healthy full-term or premature infants, the EELV is higher than the relaxation volume, the latter being determined by the passive mechanical properties of the respiratory system (1,3,5). It is only after 1 y of age that the EELV coincides with the relaxed lung volume (6); before this age, adapting reflexes must compensate for the reduced EELV. In newborns, persistence of diaphragm activity during expiration, in combination with the flow-braking action of the laryngeal adductor muscles (7), a high respiratory rate, and a reduced time-constant of the respiratory system, has been suggested to contribute to an active elevation of EELV (5,8 -11). However, in intubated and mechanically ventilated infants, the presence of an endotracheal tube does not allow for expiratory flow braking via...

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Chest wall muscle cross talk in canine costal diaphragm electromyogram

Cited by 42 publications

References 22 publications

Inspiratory muscle dysfunction in patients with severe obstructive sleep apnoea

Inspiratory muscle dysfunction in patients with severe obstructive sleep apnoea

Measurement of parasternal intercostal electromyogram during an infective exacerbation in patients with cystic fibrosis

Diaphragm Electrical Activity During Expiration in Mechanically Ventilated Infants

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