Wavelet transform analysis to assess oscillations in pial artery pulsation at the human cardiac frequency

Winklewski, Paweł J.; Gruszecki, Marcin; Wolf, Jacek; Świerblewska, Ewa; Kunicka, Katarzyna; Wszędybył-Winklewska, Magdalena; Gumiński, Wojciech; Zabulewicz, Joanna; Frydrychowski, Andrzej F.; Bieniaszewski, Leszek

doi:10.1016/j.mvr.2015.03.003

Cited by 14 publications

(38 citation statements)

References 28 publications

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“…We used this method in our earlier work [12] as a tool to characterize changes in SAS and BP. To find relationship between signals firstly we calculated a wavelet coherence (WCO) [12,20]. A value of 1 (0) indicates high (low) correlation between two time series.…”

Section: Methodsmentioning

confidence: 99%

“…A value of 1 (0) indicates high (low) correlation between two time series. Additionally, we estimated a wavelet phase coherence (WPCO) which identifies possible relationships by evaluating the match between the instantaneous phases of two signals [12,19]. The value of the phase coherence is between 0 and 1.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous study with NIR-T/BSS we documented rapid SAS oscillations associated with systolic-diastolic changes in blood volume of cerebral circulation [12]. Subsequent analysis of wavelet phase and amplitude coherences identified similarity of these two oscillators, and allowed us to clearly identify a proportion of systemic blood pressure (BP) oscillations with corresponding SAS changes.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore in the series of our recent studies we investigated the effect of apnoea [12,13], sympathetic activation [14] and hypoxia [15]—the stimuli typically seen in obstructive sleep apnoea (OSA). In particular we demonstrated that BP and SAS amplitudes coherence diminish during apnoea in normal healthy subjects [12] which is not the case in professional apnoea divers [13]. Sympathetic nervous system seems rather to stabilise the system [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…We decided to analyse collected signals up to 10 Hz due to lack any physiological process over this frequency. The power spectrum density of SAS oscillations shows clear peaks at the cardiac frequency (f0) and its harmonics (f1, f2, f3) [11,12]. We hypothesised that increased inspiratory resistance introduced by series of Mueller manoeuvres would diminish the cardiac contribution to the relationship between BP and SAS oscillations.…”

Section: Introductionmentioning

confidence: 99%

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Increased inspiratory resistance affects the dynamic relationship between blood pressure changes and subarachnoid space width oscillations

et al. 2017

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Background and objectiveRespiration is known to affect cerebrospinal fluid (CSF) movement. We hypothesised that increased inspiratory resistance would affect the dynamic relationship between blood pressure (BP) changes and subarachnoid space width (SAS) oscillations.MethodsExperiments were performed in a group of 20 healthy volunteers undergoing controlled intermittent Mueller Manoeuvres (the key characteristic of the procedure is that a studied person is subjected to a controlled, increased inspiratory resistance which results in marked potentiation of the intrathoracic negative pressure). BP and heart rate (HR) were measured using continuous finger-pulse photoplethysmography; oxyhaemoglobin saturation with an ear-clip sensor; end-tidal CO2 with a gas analyser; cerebral blood flow velocity (CBFV), pulsatility and resistive indices with Doppler ultrasound. Changes in SAS were recorded with a new method i.e. near-infrared transillumination/backscattering sounding. Wavelet transform analysis was used to assess the BP and SAS oscillations coupling.ResultsInitiating Mueller manoeuvres evoked cardiac SAS component decline (-17.8%, P<0.001), systolic BP, diastolic BP and HR increase (+6.3%, P<0.001; 6.7%, P<0.001 and +2.3%, P<0.05, respectively). By the end of Mueller manoeuvres, cardiac SAS component and HR did not change (+2.3% and 0.0%, respectively; both not statistically significant), but systolic and diastolic BP was elevated (+12.6% and +8.9%, respectively; both P<0.001). With reference to baseline values there was an evident decrease in wavelet coherence between BP and SAS oscillations at cardiac frequency in the first half of the Mueller manoeuvres (-32.3%, P<0.05 for left hemisphere and -46.0%, P<0.01 for right hemisphere) which was followed by subsequent normalization at end of the procedure (+3.1% for left hemisphere and +23.1% for right hemisphere; both not statistically significant).ConclusionsIncreased inspiratory resistance is associated with swings in the cardiac contribution to the dynamic relationship between BP and SAS oscillations. Impaired cardiac performance reported in Mueller manoeuvres may influence the pattern of cerebrospinal fluid pulsatility.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Increased inspiratory resistance affects the dynamic relationship between blood pressure changes and subarachnoid space width oscillations

et al. 2017

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Oscillations of Subarachnoid Space Width as a Potential Marker of Cerebrospinal Fluid Pulsatility

Gruszecki

Nuckowska

Szarmach

et al. 2018

Advances in Experimental Medicine and Biology

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In the cerebrospinal fluid (CSF) circulation, two components can be distinguished: bulk flow (circulation) and pulsatile flow (back and forth motion). CSF pulsatile flow is generated by both cardiac and respiratory cycles. Recent years have seen increased interest in cardiac- and respiratory-driven CSF pulsatility as an important component of cerebral homeostasis. CSF pulsatility is affected by cerebral arterial inflow and jugular outflow and potentially linked to white matter abnormalities in various diseases, such as multiple sclerosis or hypertension. In this review, we discuss the physiological mechanisms associated with CSF pulsation and its clinical significance. Finally, we explain the concept of using the oscillations of subarachnoid space width as a surrogate for CSF pulsatility.

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Modelling of subarachnoid space width changes in apnoea resulting as a function of blood flow parameters

Kalicka

Mazur

Wolf

et al. 2017

Microvascular Research

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Wavelet transform analysis to assess oscillations in pial artery pulsation at the human cardiac frequency

Cited by 14 publications

References 28 publications

Increased inspiratory resistance affects the dynamic relationship between blood pressure changes and subarachnoid space width oscillations

Increased inspiratory resistance affects the dynamic relationship between blood pressure changes and subarachnoid space width oscillations

Oscillations of Subarachnoid Space Width as a Potential Marker of Cerebrospinal Fluid Pulsatility

Modelling of subarachnoid space width changes in apnoea resulting as a function of blood flow parameters

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