Comparison Between the Respiratory Inductance Plethysmography Signal Derivative and the Airflow Signal

Eberhard, André; Calabrese, Pasquale; Baconnier, Pierre; Benchetrit, Gila

doi:10.1007/978-1-4615-1375-9_79

Cited by 50 publications

(48 citation statements)

References 6 publications

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“…When the portable monitor recording's nasal pressure signal was absent or not able to be scored throughout the recording or during portions of the recording, the flow signal derived from the rib cage and abdominal respiratory inductance plethysmography signals was used for scoring. 5 The AHI on the Nox-T3 recordings was calculated as the average number of apneas and hypopneas per hour of analysis time.…”

Section: Portable Monitor Recordingsmentioning

confidence: 99%

0491 Validation of the Nox-T3 Portable Monitor for Diagnosis of Obstructive Sleep Apnea in Chinese Adults

Han

Keenan

et al. 2017

Sleep

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Study Objectives: To evaluate the performance of a portable monitor (Nox-T3, Nox Medical Inc. Reykjavik, Iceland) used to diagnose obstructive sleep apnea in Chinese adults. Methods: Eighty Chinese adults (mean ± standard deviation age 47.6 ± 14.0 years, 77.5% males, body mass index 27.5 ± 5.4 kg/m 2 ) underwent overnight, unattended home sleep apnea testing (HSAT) with the Nox-T3 portable monitor followed by an overnight in-laboratory polysomnogram (PSG) with simultaneous portable monitor recording. The portable monitor recordings were scored using automated analysis and then manually edited using different criteria for scoring hypopneas. Polysomnography was scored based on recommended guidelines. Results: When scoring of hypopneas required a ≥ 4% oxygen desaturation event, the mean ± standard deviation apnea-hypopnea index (AHI) was 24.4 ± 20.8 events/h on HSAT, 28.0 ± 22.9 events/h on in-laboratory portable monitor recording, and 28.6 ± 23.9 events/h on PSG (P < .0001). Bland-Altman analysis of AHI on PSG versus HSAT showed a mean difference (95% confidence interval) of −4.64 (−7.15, −2.13); limits of agreement (equal to ± 2 standard deviations) was −26.62 to 17.35 events/h. Based on a threshold of AHI ≥ 5 events/h, HSAT had 95% sensitivity, 69% specificity, 94% positive predictive value, and 75% negative predictive value compared to PSG. Using an AHI ≥ 15 events/h, HSAT had 93% sensitivity, 85% specificity, 89% positive predictive value, and 91% negative predictive value. Closer agreements were present when comparing the simultaneous recordings. Similar results were obtained using different scoring criteria for hypopneas. Conclusions: Despite known differences between HSAT and PSG, the results show close agreement between the two diagnostic tests in Chinese adults, especially when controlling for night-to-night variability and changes in sleeping environment.

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Section: Portable Monitor Recordingsmentioning

confidence: 99%

0491 Validation of the Nox-T3 Portable Monitor for Diagnosis of Obstructive Sleep Apnea in Chinese Adults

Han

Keenan

et al. 2017

Sleep

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“…RIP signals were then continuously recorded during 30 min. For the purpose of calibration, RIP signals and airflow (pneumotachograph) were simultaneously recorded for 60 s, when the infant was quiet [28,29] . Oxygen saturation, heart rate, respiratory rate, and agitation episodes were monitored throughout the whole study.…”

Section: Study Protocolmentioning

confidence: 99%

“…RIP signals were recorded and calibrated using a standardized method, as previously described [28,29] . The abdominal and ribcage RIP coils were coated in a sleeveless jacket specially sized for preterm neonates.…”

Section: Eelv Variation Measurementmentioning

confidence: 99%

“…A least-squares method was used over this reference period to estimate ␣ and ␤ coefficients allowing to obtain a RIP volume signal (V RIP ) by combination of rib cage (RC) and abdominal (AB) RIP signals, in comparison to the integrated simultaneously recorded flow signal (V PNT ) [28,29] :…”

Section: Eelv Variation Measurementmentioning

confidence: 99%

“…The derivative of V RIP was then calculated by using centered divided differences [28] . A transfer function was calculated over the reference period between the V RIP and V PNT derivatives in order to take out an adjusted filter for each recording [28,29] .…”

Section: Eelv Variation Measurementmentioning

confidence: 99%

See 2 more Smart Citations

Variability of End-Expiratory Lung Volume in Premature Infants

Émériaud¹,

Baconnier

Eberhard

et al. 2010

Neonatology

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Background: Analysis of breath-to-breath variability of respiratory characteristics provides information on the respiratory control. In infants, the control of end-expiratory lung volume (EELV) is active and complex, and it can be altered by respiratory disease. The pattern of EELV variability may reflect the behavior of this regulatory system. Objectives: We aimed to characterize EELV variability in premature infants, and to evaluate variability pattern changes associated with respiratory distress and ventilatory support. Methods: EELV variations were recorded using inductance plethysmography in 18 infants (gestational age 30–33 weeks) during the first 10 days of life. An autocorrelation analysis was conducted to evaluate the ‘EELV memory’, i.e. the impact of the characteristics of one breath on the following breaths. Results: In infants without respiratory symptoms, EELV variability was high, with large standard deviations of EELV. Autocorrelation was found to be significant until a median lag of 7 (interquartiles: 4–8) breaths. Autocorrelation was markedly prolonged in patients with respiratory distress or ventilatory support, with a higher number of breath lags with significant autocorrelation (p < 0.01) and higher autocorrelation coefficients (p < 0.05). Conventional assisted ventilation does not re-establish a healthy EELV profile and is associated with lower respiratory variability. Conclusions: In premature infants, EELV variability pattern is modified by respiratory distress with a prolonged ‘EELV memory’, which suggests a greater instability of the control of EELV.

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Calibration of respiratory inductance plethysmograph in preterm infants with different respiratory conditions

Émériaud

Eberhard

Benchetrit

et al. 2008

Pediatric Pulmonology

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Respiratory inductance plethysmography (RIP) is a method for respiratory measurements particularly attractive in infants because it is noninvasive and it does not interfere with the airway. RIP calibration remains controversial in neonates, and is particularly difficult in infants with thoraco-abdominal asynchrony or with ventilatory assist. The objective of this study was to evaluate a new RIP calibration method in preterm infants either without respiratory disease, with thoraco-abdominal asynchrony, or with ventilatory support. This method is based on (i) a specifically adapted RIP jacket, (ii) the least squares method to estimate the volume/motion ribcage and abdominal coefficients, and (iii) an individualized filtering method that takes into account individual breathing pattern. The reference flow was recorded with a pneumotachograph. The accuracy of flow reconstruction using the new method was compared to the accuracy of three other calibration methods, with arbitrary fixed RIP coefficients or with coefficients determined according to qualitative diagnostic calibration method principle. Fifteen preterm neonates have been studied; gestational age was (mean +/- SD) 31.7 +/- 0.8 weeks; birth weight was 1,470 +/- 250 g. The respiratory flow determined with the new method had a goodness of fit at least equivalent to the other three methods in the entire group. Moreover, in unfavorable conditions--breathing asynchrony or ventilatory assist--the quality of fit was significantly higher than with the three other methods (P < 0.05, repeated measures ANOVA). Accuracy of tidal volume measurements was at least equivalent to the other methods, and the breath-by-breath differences with reference volumes were lower, although not significantly, than with the other methods. The goodness of fit of the reconstructed RIP flow with this new method--even in unfavorable respiratory conditions--provides a prerequisite for the study of flow pattern during the neonatal period.

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Comparison Between the Respiratory Inductance Plethysmography Signal Derivative and the Airflow Signal

Cited by 50 publications

References 6 publications

0491 Validation of the Nox-T3 Portable Monitor for Diagnosis of Obstructive Sleep Apnea in Chinese Adults

0491 Validation of the Nox-T3 Portable Monitor for Diagnosis of Obstructive Sleep Apnea in Chinese Adults

Variability of End-Expiratory Lung Volume in Premature Infants

Calibration of respiratory inductance plethysmograph in preterm infants with different respiratory conditions

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