Impedance pneumography: Noise as signal in impedance cardiography

Ernst, John M.; Litvack, Daniel A.; Lozano, David L.; Cacioppo, John T.; Berntson, Gary G.

doi:10.1017/s0048577299981003

Cited by 143 publications

(112 citation statements)

References 16 publications

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“…The respiratory signal was derived from the raw data of thoracic impedance (Ernst et al, 1999;Houtveen et al, 2006). In addition to the breathing rate (cycles per minute), the proportion of regular breathing cycles were computed.…”

Section: Data Extraction and Analysismentioning

confidence: 99%

I got it! Transient cardiovascular response to the perception of humor

Lackner

Weiss

Schulter

et al. 2013

Biological Psychology

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a b s t r a c tThe aim of the present study was to examine the transient cardiovascular response to the perception of humor, that is, the impact of the cognitive process of insight as well as the modulation of the response by the affective appraisal of the humor. To this end transient heart rate, stroke volume, cardiac output, and blood pressure responses were obtained in the immediate context of detecting the punch line in cartoons. Fine-grained analysis of the transient behavior of cardiovascular variables during viewing the cartoons was contrasted to non-humorous cartoon-like pictures. The detection of a punch line was accompanied by relative heart rate acceleration in conjunction with increased cardiac output, which was more pronounced the more amusing the cartoons were perceived. These results provide first evidence of the usefulness of cardiovascular variables for detecting the moment of insight and the quantification of the size of the emotional response accompanying it.

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Section: Data Extraction and Analysismentioning

confidence: 99%

I got it! Transient cardiovascular response to the perception of humor

Lackner

Weiss

Schulter

et al. 2013

Biological Psychology

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show abstract

“…signal. Recent studies from different groups~Ernst, Litvack, Lozano, Cacioppo, & Berntson, 1999;de Geus, Willemsen, Klaver, & van Doornen, 1995! have shown that, after appropriate bandpass filtering, thoracic impedance can be used to obtain a reliable index of respiratory frequency.…”

Section: Baro-reflex and Pulmonary Stretch-reflexmentioning

confidence: 99%

“…have shown that, after appropriate bandpass filtering, thoracic impedance can be used to obtain a reliable index of respiratory frequency. Furthermore, in a within-subject design, the spectral power of the filtered thoracic impedance signal can be used as an approximation of changes in respiratory depth Ernst et al, 1999!.…”

Section: Baro-reflex and Pulmonary Stretch-reflexmentioning

confidence: 99%

Contribution of tonic vagal modulation of heart rate, central respiratory drive, respiratory depth, and respiratory frequency to respiratory sinus arrhythmia during mental stress and physical exercise

Rietveld

Geus

2002

Psychophysiol.

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This study tested various sources of changes in respiratory sinus arrhythmia~RSA!. Twenty-two healthy participants participated in three experimental conditions~mental stress, relaxation, and mild physical exercise! that each consisted of three breathing parts~normal breathing, breathing compressed room air, and breathing compressed 5% CO 2 -enriched air!. Independent contributions to changes in RSA were found for changes in tonic vagal modulation of heart rate, central respiratory drive~i.e., PaCO 2 !, respiratory depth, and respiratory frequency. The relative contributions to changes in RSA differed for mental stress and physical exercise. It is concluded that uncorrected RSA will suffice to index within-subject changes in tonic vagal modulation of heart rate in most situations. However, if the central respiratory drive is expected to change, RSA should ideally be corrected for changes in PaCO 2 , respiratory depth, and respiratory frequency.

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“…de Geus et al (1995) showed that band-pass filtered thoracic impedance signals obtained from four spot electrodes can reliable be used for the assessment of respiratory rate. Ernst et al (1999) took this further and validated the full respiratory signal, as obtained from impedance cardiography, against respiratory signals obtained in parallel from a respiratory belt and continuous direct spirometry. Validation was done during baseline, paced breathing, abdominal and thoracic breathing and a verbal arithmetic task.…”

Section: Introductionmentioning

confidence: 99%

“…This approach requires both signals to be equally scaled and cannot be applied to demonstrate a deviation between the unscaled thoracic impedance amplitude and spirometric volume. To deal with this problem, Ernst et al (1999) computed variability of gain parameters (referred to in their paper as Fconsistency of gain_). Gains can be obtained by dividing the observed thoracic impedance amplitudes (the output values) by the corresponding spirometric volumes (the input values).…”

Section: Introductionmentioning

confidence: 99%

Validation of the thoracic impedance derived respiratory signal using multilevel analysis

Houtveen

Groot

Geus

2006

International Journal of Psychophysiology

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The purpose of the current study was to validate the change in thoracic impedance (dZ) derived respiratory signal obtained from four spot electrodes against incidental spirometry. Additionally, a similar validation was performed for a dual respiratory belts signal to compare the relative merit of both methods. Participants were 38 healthy adult subjects (half male, half female). Cross-method comparisons were performed at three (paced) respiration frequencies in sitting, supine and standing postures. Multilevel regression was used to examine the within-and between-subjects structure of the relationship between spirometric volume and the respiratory amplitude signals obtained from either dZ or respiratory belts. Both dZ derived respiratory rate and dual belts derived respiratory rate accurately reflected the pacing frequencies. For both methods, fixed factors indicated acceptable but posture-specific regression on spirometric volume. However, random factors indicated large individual differences, which was supported by variability of gain analyses. It was concluded that both the dZ and dual belts methods can be used for measurement of respiratory rate and within-subjects, posture-specific, changes in respiratory volume. The need for frequent subject-specific and posture-specific calibration combined with relatively large measurement errors may strongly limit the usefulness of both methods to assess absolute tidal volume and minute ventilation in ambulatory designs. D

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Impedance pneumography: Noise as signal in impedance cardiography

Cited by 143 publications

References 16 publications

I got it! Transient cardiovascular response to the perception of humor

I got it! Transient cardiovascular response to the perception of humor

Contribution of tonic vagal modulation of heart rate, central respiratory drive, respiratory depth, and respiratory frequency to respiratory sinus arrhythmia during mental stress and physical exercise

Validation of the thoracic impedance derived respiratory signal using multilevel analysis

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