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Epiu I, Gandevia SC, Boswell‐Ruys CL, Carter SG, Finn HT, Nguyen DAT, Butler JE, Hudson AL. Respiratory-related evoked potentials in chronic obstructive pulmonary disease and healthy aging. Physiol Rep 2022; 10:e15519. [PMID: 36461659 PMCID: PMC9718949 DOI: 10.14814/phy2.15519] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 06/17/2023] Open
Abstract
Altered neural processing and increased respiratory sensations have been reported in chronic obstructive pulmonary disease (COPD) as larger respiratory-related evoked potentials (RREPs), but the effect of healthy-aging has not been considered adequately. We tested RREPs evoked by brief airway occlusions in 10 participants with moderate-to-severe COPD, 11 age-matched controls (AMC) and 14 young controls (YC), with similar airway occlusion pressure stimuli across groups. Mean age was 76 years for COPD and AMC groups, and 30 years for the YC group. Occlusion intensity and unpleasantness was rated using the modified Borg scale, and anxiety rated using the Hospital Anxiety and Depression Scale. There was no difference in RREP peak amplitudes across groups, except for the N1 peak, which was significantly greater in the YC group than the COPD and AMC groups (p = 0.011). The latencies of P1, P2 and P3 occurred later in COPD versus YC (p < 0.05). P3 latency occurred later in AMC than YC (p = 0.024). COPD and AMC groups had similar Borg ratings for occlusion intensity (3.0 (0.5, 3.5) [Median (IQR)] and 3.0 (3.0, 3.0), respectively; p = 0.476) and occlusion unpleasantness (1.3 (0.1, 3.4) and 1.0 (0.75, 2.0), respectively; p = 0.702). The COPD group had a higher anxiety score than AMC group (p = 0.013). A higher N1 amplitude suggests the YC group had higher cognitive processing of respiratory inputs than the COPD and AMC groups. Both COPD and AMC groups showed delayed neural responses to the airway occlusion, which may indicate impaired processing of respiratory sensory inputs in COPD and healthy aging.
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Affiliation(s)
- Isabella Epiu
- Neuroscience Research AustraliaRandwickNew South WalesAustralia
- University of New South WalesSydneyNew South WalesAustralia
- Prince of Wales HospitalSydneyNew South WalesAustralia
| | - Simon C. Gandevia
- Neuroscience Research AustraliaRandwickNew South WalesAustralia
- University of New South WalesSydneyNew South WalesAustralia
- Prince of Wales HospitalSydneyNew South WalesAustralia
| | - Claire L. Boswell‐Ruys
- Neuroscience Research AustraliaRandwickNew South WalesAustralia
- University of New South WalesSydneyNew South WalesAustralia
- Prince of Wales HospitalSydneyNew South WalesAustralia
| | - Sophie G. Carter
- Neuroscience Research AustraliaRandwickNew South WalesAustralia
- University of New South WalesSydneyNew South WalesAustralia
| | - Harrison T. Finn
- Neuroscience Research AustraliaRandwickNew South WalesAustralia
- University of New South WalesSydneyNew South WalesAustralia
| | - David A. T. Nguyen
- Neuroscience Research AustraliaRandwickNew South WalesAustralia
- University of New South WalesSydneyNew South WalesAustralia
| | - Jane E. Butler
- Neuroscience Research AustraliaRandwickNew South WalesAustralia
- University of New South WalesSydneyNew South WalesAustralia
| | - Anna L. Hudson
- Neuroscience Research AustraliaRandwickNew South WalesAustralia
- University of New South WalesSydneyNew South WalesAustralia
- College of Medicine and Public HealthFlinders UniversityBedford ParkSouth AustraliaAustralia
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Abstract
The clinical term dyspnea (a.k.a. breathlessness or shortness of breath) encompasses at least three qualitatively distinct sensations that warn of threats to breathing: air hunger, effort to breathe, and chest tightness. Air hunger is a primal homeostatic warning signal of insufficient alveolar ventilation that can produce fear and anxiety and severely impacts the lives of patients with cardiopulmonary, neuromuscular, psychological, and end-stage disease. The sense of effort to breathe informs of increased respiratory muscle activity and warns of potential impediments to breathing. Most frequently associated with bronchoconstriction, chest tightness may warn of airway inflammation and constriction through activation of airway sensory nerves. This chapter reviews human and functional brain imaging studies with comparison to pertinent neurorespiratory studies in animals to propose the interoceptive networks underlying each sensation. The neural origins of their distinct sensory and affective dimensions are discussed, and areas for future research are proposed. Despite dyspnea's clinical prevalence and impact, management of dyspnea languishes decades behind the treatment of pain. The neurophysiological bases of current therapeutic approaches are reviewed; however, a better understanding of the neural mechanisms of dyspnea may lead to development of novel therapies and improved patient care.
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Affiliation(s)
- Andrew P Binks
- Department of Basic Science Education, Virginia Tech Carilion School of Medicine, Roanoke, VA, United States; Faculty of Health Sciences, Virginia Tech, Blacksburg, VA, United States.
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Herzog M, Sucec J, Jelinčić V, Van Diest I, Van den Bergh O, Chan PYS, Davenport P, von Leupoldt A. The test-retest reliability of the respiratory-related evoked potential. Biol Psychol 2021; 163:108133. [PMID: 34118356 DOI: 10.1016/j.biopsycho.2021.108133] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 06/05/2021] [Accepted: 06/06/2021] [Indexed: 12/30/2022]
Abstract
The respiratory-related evoked potential (RREP) is an established technique to study the neural processing of respiratory sensations. We examined the test-retest reliability of the RREP during an unloaded baseline condition (no dyspnea) and an inspiratory resistive loaded breathing condition (dyspnea) over a one-week period. RREPs were evoked by short inspiratory occlusions (150 ms) while EEG was continuously measured. The mean amplitudes of the RREP components Nf, P1, N1, P2, and P3 were studied. For the no dyspnea condition, moderate test-retest reliability for Nf (intraclass correlation coefficient ICC: 0.73) and P1 (ICC: 0.74), good test-retest reliability for N1 (ICC: 0.89) and P3 (ICC: 0.76), and excellent test-retest reliability for P2 (ICC: 0.92) was demonstrated. For the dyspnea condition, moderate test-retest reliability was found for Nf (ICC: 0.69) and P1 (ICC: 0.57) and good test-retest reliability for N1 (ICC: 0.77), P2 (ICC: 0.84), and P3 (ICC: 0.77). This indicates that the RREP components Nf, P1, N1, P2, and P3, elicited by inspiratory occlusions, show adequate reliability in a test-retest study design with or without parallel sustained resistive load-induced dyspnea.
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Affiliation(s)
| | - Josef Sucec
- Health Psychology, University of Leuven, Leuven, Belgium
| | | | - Ilse Van Diest
- Health Psychology, University of Leuven, Leuven, Belgium
| | | | - Pei-Ying S Chan
- Department of Occupational Therapy and Healthy Aging Research Centre, Chang Gung University, Taoyuan, Taiwan
| | - Paul Davenport
- Department of Physiological Sciences, University of Florida, Gainesville, USA
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Ruehland WR, Rochford PD, Pierce RJ, Trinder J, Jordan AS, Cori JM, O'Donoghue FJ. Genioglossus muscle responses to resistive loads in severe OSA patients and healthy control subjects. J Appl Physiol (1985) 2019; 127:1586-1598. [PMID: 31647723 DOI: 10.1152/japplphysiol.00186.2019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This study aimed to determine whether there is impairment of genioglossus neuromuscular responses to small negative pressure respiratory stimuli, close to the conscious detection threshold, in obstructive sleep apnea (OSA). We compared genioglossus electromyogram (EMGgg) responses to midinspiratory resistive loads of varying intensity (≈1.2-6.2 cmH2O·L-1·s), delivered via a nasal mask, between 16 severe OSA and 17 control participants while the subjects were awake and in a seated upright position. We examined the relationship between stimulus intensity and peak EMGgg amplitude in a 200-ms poststimulus window and hypothesized that OSA patients would have an increased activation threshold and reduced sensitivity in the relationship between EMGgg activation and stimulus intensity. There was no significant difference between control and OSA participants in the threshold (P = 0.545) or the sensitivity (P = 0.482) of the EMGgg amplitude vs. stimulus intensity relationship, where change in epiglottic pressure relative to background epiglottic pressure represented stimulus intensity. These results do not support the hypothesis that deficits in neuromuscular response to negative upper airway pressure exist in OSA during wakefulness; however, the results are likely influenced by a counterintuitive and novel genioglossus muscle suppression response observed in a significant proportion of both OSA and healthy control participants. This suppression response may relate to the inhibition seen in inspiratory muscles such as the diaphragm in response to sudden-onset negative pressure, and its presence provides new insight into the upper airway neuromuscular response to the collapsing force of negative pressure.NEW & NOTEWORTHY Our study used a novel midinspiratory resistive load stimulus to study upper airway neuromuscular responses to negative pressure during wakefulness in obstructive sleep apnea (OSA). Although no differences were found between OSA and healthy groups, the study uncovered a novel and unexpected suppression of neuromuscular activity in a large proportion of both OSA and healthy participants. The unusual response provides new insight into the upper airway neuromuscular response to the collapsing force of negative pressure.
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Affiliation(s)
- Warren R Ruehland
- Institute for Breathing and Sleep, Austin Health, Heidelberg, Victoria, Australia.,Department of Medicine (Austin Health), University of Melbourne, Heidelberg, Victoria, Australia
| | - Peter D Rochford
- Institute for Breathing and Sleep, Austin Health, Heidelberg, Victoria, Australia
| | - Robert J Pierce
- Institute for Breathing and Sleep, Austin Health, Heidelberg, Victoria, Australia.,Department of Medicine (Austin Health), University of Melbourne, Heidelberg, Victoria, Australia
| | - John Trinder
- School of Psychological Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Amy S Jordan
- Institute for Breathing and Sleep, Austin Health, Heidelberg, Victoria, Australia.,School of Psychological Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Jennifer M Cori
- Institute for Breathing and Sleep, Austin Health, Heidelberg, Victoria, Australia
| | - Fergal J O'Donoghue
- Institute for Breathing and Sleep, Austin Health, Heidelberg, Victoria, Australia.,Department of Medicine (Austin Health), University of Melbourne, Heidelberg, Victoria, Australia
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5
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Sensory detection of threshold intensity resistive loads in severe obstructive sleep apnoea. Respir Physiol Neurobiol 2017; 236:29-41. [DOI: 10.1016/j.resp.2016.10.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 09/20/2016] [Accepted: 10/27/2016] [Indexed: 11/17/2022]
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Negative emotional stimulation decreases respiratory sensory gating in healthy humans. Respir Physiol Neurobiol 2014; 204:50-7. [DOI: 10.1016/j.resp.2014.08.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 08/25/2014] [Accepted: 08/27/2014] [Indexed: 12/24/2022]
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Eckert DJ, Lo YL, Saboisky JP, Jordan AS, White DP, Malhotra A. Sensorimotor function of the upper-airway muscles and respiratory sensory processing in untreated obstructive sleep apnea. J Appl Physiol (1985) 2011; 111:1644-53. [PMID: 21885797 PMCID: PMC3233889 DOI: 10.1152/japplphysiol.00653.2011] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 08/30/2011] [Indexed: 11/22/2022] Open
Abstract
Numerous studies have demonstrated upper-airway neuromuscular abnormalities during wakefulness in snorers and obstructive sleep apnea (OSA) patients. However, the functional role of sensorimotor impairment in OSA pathogenesis/disease progression and its potential effects on protective upper-airway reflexes, measures of respiratory sensory processing, and force characteristics remain unclear. This study aimed to gain physiological insight into the potential role of sensorimotor impairment in OSA pathogenesis/disease progression by comparing sensory processing properties (respiratory-related evoked potentials; RREP), functionally important protective reflexes (genioglossus and tensor palatini) across a range of negative pressures (brief pulses and entrained iron lung ventilation), and tongue force and time to task failure characteristics between 12 untreated OSA patients and 13 controls. We hypothesized that abnormalities in these measures would be present in OSA patients. Upper-airway reflexes (e.g., genioglossus onset latency, 20 ± 1 vs. 19 ± 2 ms, P = 0.82), early RREP components (e.g., P1 latency 25 ± 2 vs. 25 ± 1 ms, P = 0.78), and the slope of epiglottic pressure vs. genioglossus activity during iron lung ventilation (-0.68 ± 1.0 vs. -0.80 ± 2.0 cmH(2)O/%max, P = 0.59) were not different between patients and controls. Maximal tongue protrusion force was greater in OSA patients vs. controls (35 ± 2 vs. 27 ± 2 N, P < 0.01), but task failure occurred more rapidly (149 ± 24 vs. 254 ± 23 s, P < 0.01). Upper-airway protective reflexes across a range of negative pressures as measured by electromyography and the early P1 component of the RREP are preserved in OSA patients during wakefulness. Consistent with an adaptive training effect, tongue protrusion force is increased, not decreased, in untreated OSA patients. However, OSA patients may be vulnerable to fatigue of upper-airway dilator muscles, which could contribute to disease progression.
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Affiliation(s)
- Danny J Eckert
- Brigham and Women's Hospital, Div. of Sleep Medicine, Sleep Disorders Program, Boston, MA 02115, USA.
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8
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Grippo A, Carrai R, Romagnoli I, Pinto F, Fanfulla F, Sanna A. Blunted respiratory-related evoked potential in awake obstructive sleep apnoea subjects: a NEP technique study. Clin Neurophysiol 2011; 122:1562-8. [PMID: 21306946 DOI: 10.1016/j.clinph.2011.01.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2010] [Revised: 12/18/2010] [Accepted: 01/06/2011] [Indexed: 10/18/2022]
Abstract
OBJECTIVE Respiratory-related evoked potentials (RREP) elicited by transmural pressure in obstructive sleep apnoea (OSA) subjects have reported conflicting data. Different features of pressure stimuli and/or in the timing of stimuli application seem to account for these contradictory results. The negative expiratory pressure (NEP) technique, highly reproducible in terms of rise time and pressure values, allows to minimize the methodological confounding factors. We determined whether the afferent activity from the upper airway (UA) is altered in OSA subjects. METHODS RREP potentials were examined in 10 OSA and in 12 non-apnoeic awake subjects by means of the NEP technique. RESULTS All controls showed a cortical response to all pressure stimuli. All OSA subjects showed responses to -5 and -10 cmH(2)O whereas six of them showed no responses to -1 cmH(2)O. The amplitude of the P22, N45 and P85 components of the RREP was significantly reduced in OSA with respect to the controls in response to both the -5 and -10 cmH(2)O stimuli. We found no significant differences in latencies. CONCLUSIONS Awake OSA subjects had a raised threshold to pressure stimuli and blunted respiratory-related evoked potentials. SIGNIFICANCE These data indicate a deficit in afferent activity in the UA.
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Affiliation(s)
- Antonello Grippo
- SOD Neurofisiopatologia DAI Scienze Neurologiche AOU Careggi, Firenze, Italy.
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9
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Respiratory related evoked potential measures of cerebral cortical respiratory information processing. Biol Psychol 2010; 84:4-12. [DOI: 10.1016/j.biopsycho.2010.02.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Revised: 01/28/2010] [Accepted: 02/10/2010] [Indexed: 11/22/2022]
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10
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Donzel-Raynaud C, Redolfi S, Arnulf I, Similowski T, Straus C. Abnormal respiratory-related evoked potentials in untreated awake patients with severe obstructive sleep apnoea syndrome. Clin Physiol Funct Imaging 2008; 29:10-7. [PMID: 18803640 DOI: 10.1111/j.1475-097x.2008.00830.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIM Obstructive sleep apnoeas generate an intense afferent traffic leading to arousal and apnoea termination. Yet a decrease in the sensitivity of the afferents has been described in patients with obstructive sleep apnoea, and could be a determinant of disease severity. How mechanical changes within the respiratory system are processed in the brain can be studied through the analysis of airway occlusion-related respiratory-related evoked potentials. Respiratory-related evoked potentials have been found altered during sleep in mild and moderate obstructive sleep apnoea syndrome, with contradictory results during wake. We hypothesized that respiratory-related evoked potentials' alterations during wake, if indeed a feature of the obstructive sleep apnoea syndrome, should be present in untreated severe patients. METHODS Ten untreated patients with severe obstructive sleep apnoea syndrome and eight matched controls were studied. Respiratory-related evoked potentials were recorded in Cz-C3 and Cz-C4, and described in terms of the amplitudes and latencies of their components P1, N1, P2 and N2. RESULTS Components amplitudes were similar in both groups. There was no significant difference in P1 latencies. This was also the case for N1 in Cz-C3. In contrast, N1 latencies in Cz-C4 were significantly longer in patients with obstructive sleep apnoea syndrome [median 98 ms (interquartile range 16.00) versus 79.5 ms (5.98), P = 0.015]. P2 and N2 were also significantly delayed, on both sides. CONCLUSIONS The cortical processing of airway occlusion-related afferents seems abnormal in untreated patients with severe obstructive sleep apnoea syndrome. This could be either a severity marker and/or an aggravating factor.
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Affiliation(s)
- Christine Donzel-Raynaud
- AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Laboratoire de Physiopathologie Respiratoire, Paris, France.
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Huang J, Marcus CL, Bandla P, Schwartz MS, Pepe ME, Samuel JM, Panitch HB, Bradford RM, Mosse YP, Maris JM, Colrain IM. Cortical processing of respiratory occlusion stimuli in children with central hypoventilation syndrome. Am J Respir Crit Care Med 2008; 178:757-64. [PMID: 18658113 DOI: 10.1164/rccm.200804-606oc] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE The ability of patients with central hypoventilation syndrome (CHS) to produce and process mechanoreceptor signals is unknown. OBJECTIVES Children with CHS hypoventilate during sleep, although they generally breathe adequately during wakefulness. Previous studies suggest that they have compromised central integration of afferent stimuli, rather than abnormal sensors or receptors. Cortical integration of afferent mechanical stimuli caused by respiratory loading or upper airway occlusion can be tested by measuring respiratory-related evoked potentials (RREPs). We hypothesized that patients with CHS would have blunted RREP during both wakefulness and sleep. METHODS RREPs were produced with multiple upper airway occlusions and were obtained during wakefulness, stage 2, slow-wave, and REM sleep. Ten patients with CHS and 20 control subjects participated in the study, which took place at the Children's Hospital of Philadelphia. Each patient was age- and sex-matched to two control subjects. Wakefulness data were collected from 9 patients and 18 control subjects. MEASUREMENTS AND MAIN RESULTS During wakefulness, patients demonstrated reduced Nf and P300 responses compared with control subjects. During non-REM sleep, patients demonstrated a reduced N350 response. In REM sleep, patients had a later P2 response. CONCLUSIONS CHS patients are able to produce cortical responses to mechanical load stimulation during both wakefulness and sleep; however, central integration of the afferent signal is disrupted during wakefulness, and responses during non-REM are damped relative to control subjects. The finding of differences between patients and control subjects during REM may be due to increased intrinsic excitatory inputs to the respiratory system in this state.
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Affiliation(s)
- Jingtao Huang
- The Sleep Center, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
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12
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Fauroux B, Renault F, Boelle PY, Donzel-Raynaud C, Nicot F, Clément A, Straus C, Similowski T. Impaired cortical processing of inspiratory loads in children with chronic respiratory defects. Respir Res 2007; 8:61. [PMID: 17822538 PMCID: PMC2020473 DOI: 10.1186/1465-9921-8-61] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2007] [Accepted: 09/06/2007] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Inspiratory occlusion evoked cortical potentials (the respiratory related-evoked potentials, RREPs) bear witness of the processing of changes in respiratory mechanics by the brain. Their impairment in children having suffered near-fatal asthma supports the hypothesis that relates asthma severity with the ability of the patients to perceive respiratory changes. It is not known whether or not chronic respiratory defects are associated with an alteration in brain processing of inspiratory loads. The aim of the present study was to compare the presence, the latencies and the amplitudes of the P1, N1, P2, and N2 components of the RREPs in children with chronic lung or neuromuscular disease. METHODS RREPs were recorded in patients with stable asthma (n = 21), cystic fibrosis (n = 32), and neuromuscular disease (n = 16) and in healthy controls (n = 11). RESULTS The 4 RREP components were significantly less frequently observed in the 3 groups of patients than in the controls. Within the patient groups, the N1 and the P2 components were significantly less frequently observed in the patients with asthma (16/21 for both components) and cystic fibrosis (20/32 and 14/32) than in the patients with neuromuscular disease (15/16 and 16/16). When present, the latencies and amplitudes of the 4 components were similar in the patients and controls. CONCLUSION Chronic ventilatory defects in children are associated with an impaired cortical processing of afferent respiratory signals.
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Affiliation(s)
- Brigitte Fauroux
- AP-HP, Hôpital Armand Trousseau, Pediatric Pulmonary Department, Paris, 75571 France
- Inserm UMR-S 719, Paris, 75000, France, Université Pierre et Marie Curie-Paris6, 75571 France
| | - Francis Renault
- AP-HP, Hôpital Armand Trousseau, Paediatric Neurophysiology Unit, Paris, 75571 France
| | - Pierre Yves Boelle
- AP-HP, Hôpital Saint Antoine, Department of Biostatistics, 75012 Paris, Inserm U444, 75000, Paris, France
| | - Christine Donzel-Raynaud
- AP-HP, Hôpital La Pitié Salpétrière, Respiratory Physiology, Pulmonology and Intensive Care, Paris, France
| | - Frédéric Nicot
- Inserm UMR-S 719, Paris, 75000, France, Université Pierre et Marie Curie-Paris6, 75571 France
| | - Annick Clément
- AP-HP, Hôpital Armand Trousseau, Pediatric Pulmonary Department, Paris, 75571 France
- Inserm UMR-S 719, Paris, 75000, France, Université Pierre et Marie Curie-Paris6, 75571 France
| | - Christian Straus
- AP-HP, Hôpital La Pitié Salpétrière, Respiratory Physiology, Pulmonology and Intensive Care, Paris, France
- UPRES EA 2397, Université Pierre et Marie Curie-Paris6, Paris, France
| | - Thomas Similowski
- AP-HP, Hôpital La Pitié Salpétrière, Respiratory Physiology, Pulmonology and Intensive Care, Paris, France
- UPRES EA 2397, Université Pierre et Marie Curie-Paris6, Paris, France
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Nicot F, Renault F, Clément A, Fauroux B. Respiratory-related evoked potentials in children with asthma. Neurophysiol Clin 2007; 37:29-33. [PMID: 17418355 DOI: 10.1016/j.neucli.2007.01.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
AIMS OF THE STUDY Respiratory-related evoked potentials (RREPs) are a method of recording brain activities in response to respiratory stimuli. Although data in childhood are scarce, the absence of the early P1 component of RREPs has been reported in children with a history of life-threatening asthma. This study was focused on the presence, latencies, and amplitudes of the P1, N1, P2, and N2 components of the RREPs in a paediatric series of asthmatic patients. PATIENTS AND METHODS RREPs were recorded in 21 patients with stable asthma, age range 8-17 years, 11 healthy children, age range 6-16 years, and 24 healthy adults, age range 20-28 years. The signals from left (C3-Cz) and right (C4-Cz) central (rolandic) location were recorded separately, using surface electrodes. Evoked responses to two series of 80 consecutive mid-inspiratory occlusions were averaged. Recordings were analysed manually. RESULTS All 4 RREPs components were significantly more often absent in asthmatic children than in healthy children and adults (P1, p=0.01; N1, p=0.008; P2, p=0.008, N2, p=0.01). The latencies and amplitudes of the four components were similar in patients and healthy subjects. CONCLUSION RREPs components were less frequently present in children with asthma than in healthy subjects. This finding should promote the recording of RREPs in other acute and chronic respiratory diseases in children in order to search for possible electroclinical correlations.
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Affiliation(s)
- F Nicot
- Unité Inserm U719, AP-HP, hôpital Armand-Trousseau, Paris, France
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15
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Demoule A, Similowski T. Techniques électrophysiologiques d’évaluation fonctionnelle des muscles respiratoires : données récentes (1998-2004). Rev Mal Respir 2005; 22:163-8. [PMID: 15968773 DOI: 10.1016/s0761-8425(05)85451-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- A Demoule
- Service de Pneumologie et Réanimation, Groupe Hospitalier Pitié-Salpêtrière, Assistance Publique, Hôpitaux de Paris et UPRES EA 2397, Université Pierre et Marie Curie Paris VI, Paris, France
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