Wavelet transform of heart rate variability to assess autonomic nervous system activity does not predict arousal from general anesthesia

Pichot, Vincent; Buffière, S; Gaspoz, Jean‐Michel; Costes, Frédéric; Molliex, Serge; Duverney, David; Roche, Frédéric; Barthélémy, Jean‐Claude

doi:10.1007/bf03017350

Cited by 50 publications

(29 citation statements)

References 5 publications

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“…The Table clearly shows that a level of T11 is reached in most patients at six minutes post-epidural blockade, and this also corresponds with a significant increase in HF power of HR variability. This increase, which has been repeatedly associated with parasympathetic outflow, 2,3,5,6,[12][13][14] maintains a plateau thereafter. This could be sufficient to confirm adequate somatosensory block level in these patients.…”

Section: Discussionmentioning

confidence: 85%

“…Wavelet transform allows for the analysis of rapidly changing HR and BP. Changes in high frequency (HF) power of HR variability have been shown to indicate changes in parasympathetic activity, [2][3][4][5][6][7][8] while changes in all frequencies of BP variability have been correlated with changes in sympathetic activity.…”

Section: Protocolmentioning

confidence: 99%

“…The mother wavelet function used in this study is called "Daubechies 4". 2,5 It was chosen as the best approximation of the shape of the signal to be analyzed. Serial lists of coefficients called "wavelet coefficients" are obtained representing the evolution of the correlation between the signal and the wavelet for different wavelet functions.…”

Section: Analysis Of Hr and Bp Variabilitymentioning

confidence: 99%

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La variabilité de la fréquence cardiaque et de la tension artérielle comme indicateurs du bloc sensitif lors de l’analgésie péridurale pour le travail obstétrical

Deschamps

Kaufman

Geist

et al. 2007

Can J Anesth/J Can Anesth

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Purpose:To evaluate the correlation between the progression of somatosensory blockade and changes in autonomic outflow following the onset of labour epidural analgesia. Methods: Twelve labouring parturients consented to participate in the study. Baseline electrocardiogram, blood pressure (BP) and respiratory rate were recorded for ten minutes. The epidural consisted of 0.125% bupivacaine with 50 µg of fentanyl (total volume 20 mL). Measurements were repeated for ten minutes after initiation of the block. The level of sensory block was measured bilaterally with loss of sensation to ice at twominute intervals. Wavelet transform was used to obtain heart rate (HR) and BP variability every two minutes following the loading dose of epidural medication. High frequency power of HR variability was used to assess changes in parasympathetic activity. The total power of BP variability was used to assess changes in sympathetic activity. A nonparametric repeated measures ANOVA was used for the variability data, and a Spearman rank correlation test was used to evaluate the relationship between the sensory block and HR and BP variability. Results: The sensory block progressed to T9 at ten minutes post-epidural and was the mirror image of the decrease in total power of BP variability. High frequency power of HR variability increased to a plateau at six minutes post-epidural. A significant correlation was found between the increase in sensory block and the observed decrease in BP variability (r = -1.000, P = 0.0028). Conclusion: In this study of labouring parturients, BP variability correlated with the progression of both sympathetic and somatosensory block following epidural anesthesia, while HR variability was shown to be a surrogate marker of increased parasympathetic activity.

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Section: Discussionmentioning

confidence: 85%

Section: Protocolmentioning

confidence: 99%

Section: Analysis Of Hr and Bp Variabilitymentioning

confidence: 99%

See 1 more Smart Citation

La variabilité de la fréquence cardiaque et de la tension artérielle comme indicateurs du bloc sensitif lors de l’analgésie péridurale pour le travail obstétrical

Deschamps

Kaufman

Geist

et al. 2007

Can J Anesth/J Can Anesth

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“…Wavelet transformation is one technique that has been used successfully for this purpose. 13,14,16 Secondly, while changes in parasympathetic and sympathetic tone have been validated using this technique in awake patients, the technique will still have to be validated in anesthetized patients, where autonomic tone is greatly attenuated. Studies are currently underway to validate these measurements.…”

mentioning

confidence: 99%

“…La transformation par ondelettes est l'une des techniques qui a réussi à remplir cette mission. 13,14,16 Deuxièmement, bien que les changements du tonus parasympathique et sympathique aient été validés en utilisant cette technique sur des patients éveillés, il faudra néanmoins valider cette technique chez des patients anesthésiés dont le tonus autonome est très atténué. Des études sont actuellement en cours pour valider ces mesures.…”

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Analysis of heart rate variability: a useful tool to evaluate autonomic tone in the anesthetized patient?

Deschamps

Denault

2008

Can J Anesth/J Can Anesth

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Parasympathetic heart rate modulation during parabolic flights

Beckers¹,

Seps²,

Ramaekers

et al. 2003

Eur J Appl Physiol

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During parabolic flight short periods of microgravity and hypergravity are created. These changes influence cardiovascular function differently according to posture. During the 29th parabolic flight campaign of the European Space Agency (ESA), the electrocardiogram (ECG) was recorded continuously in seven healthy volunteers in two positions (standing and supine). Five different phases were differentiated: 1 g (1 g=9.81 m/s(2)) before and after each parabola, 1.8 g at the ascending leg of the parabola (hypergravity), 0 g at the apex, 1.6 g at the descending leg (hypergravity). We assessed heart rate variability (HRV) by indices of temporal analysis [mean RR interval (meanRR), the standard deviation of the intervals (SDRR), and the square root of the mean squared differences of successive intervals (rMSSD) and coefficient of variation (CV)]. In the supine position no significant differences were shown between different gravity phases for all HRV indices. In the standing position the 0 g phase showed a tendency towards higher values of meanRR compared to the control and to the other phases ( p=NS). SDRR, rMSSD and CV were significantly higher compared to control ( p<0.05). Significantly higher values for meanRR in the supine position at 1 g and hypergravity ( p<0.05) were found when compared to standing. SDRR was significantly higher at 0 g in the standing position compared to supine [95 (44) ms vs. 50 (15) ms; p<0.05] and lower in other phases. rMSSD and CV showed the same trend ( p=NS). We confirm that, during parabolic flights, position matters for cardiovascular measurements. Time domain indices of HRV during different gravity phases showed: (1) higher vagal modulation of the autonomic nervous system in microgravity, when compared with normo- or hypergravity in standing subjects; and (2) no differences in supine subjects between different g phases.

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Wavelet transform of heart rate variability to assess autonomic nervous system activity does not predict arousal from general anesthesia

Cited by 50 publications

References 5 publications

La variabilité de la fréquence cardiaque et de la tension artérielle comme indicateurs du bloc sensitif lors de l’analgésie péridurale pour le travail obstétrical

La variabilité de la fréquence cardiaque et de la tension artérielle comme indicateurs du bloc sensitif lors de l’analgésie péridurale pour le travail obstétrical

Analysis of heart rate variability: a useful tool to evaluate autonomic tone in the anesthetized patient?

Parasympathetic heart rate modulation during parabolic flights

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