Cutaneous sympathetic vasoconstrictor reflexes for the evaluation of interscalene brachial plexus block

Lehtipalo, Stefan; Winsö, Ola; Koskinen, Lars-Owe D.; Johansson, Göran; Biber, Björn

doi:10.1034/j.1399-6576.2000.440809.x

Cited by 30 publications

(31 citation statements)

References 18 publications

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“…The effect of the local anaesthetic mixture (bupivacaine and/or lidocaine) used in this study on the autonomic nervous system activity during brachial plexus block has also been studied previously using LDF signals (Landsverk et al 2006, Lehtipalo et al 2000, Szili-Torok et al 2002. Landsverk et al (2006) analysed LDF signals from ASA I patients undergoing hand surgery.…”

Section: Discussionmentioning

confidence: 99%

“…In this study HRV signals acquired from a group of patients undergoing local anaesthesia (axillary brachial plexus block) have been analysed to see the effect of local anaesthetic drug on the cardiovascular autonomic control. The inhibitory effect of the Brachial plexus block on the sympathetic and the endothelial activity has been demonstrated in previous studies (Landsverk et al 2006, Lehtipalo et al 2000, Szili-Torok et al 2002 by analysing the laser Doppler flowmetry (LDF) signals. Such information regarding the effect of local anaesthesia on autonomic nervous system could be helpful in anaesthetic management.…”

Section: Introductionmentioning

confidence: 99%

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Empirical mode decomposition analysis of HRV data from patients undergoing local anaesthesia (brachial plexus block)

Shafqat¹,

Pal²,

Kumari³

et al. 2011

Physiol. Meas.

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Spectral analysis of heart rate variability (HRV) is used for the assessment of cardiovascular autonomic control. In this study, a data-driven adaptive technique called empirical mode decomposition (EMD) and the associated Hilbert spectrum has been used to evaluate the effect of local anaesthesia on HRV parameters in a group of 14 patients undergoing axillary brachial plexus block. The normalized amplitude Hilbert spectrum was used to calculate the error index associated with the instantaneous frequency. The amplitude and the frequency values were corrected in the region where the error was higher than twice standard deviation. The intrinsic mode function (IMF) components were assigned to the LF and the HF part of the signal by making use of the centre frequency and the standard deviation spectral extension estimated from the marginal spectrum of the IMF components. The optimal range of the stopping criterion was found to be between 4 and 9 for the HRV data. The statistical analysis showed that the LF/HF ratio decreased within an hour of the application of the brachial plexus block compared to the values at the start of the procedure. These changes were observed in 13 of the 14 patients included in this study.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Empirical mode decomposition analysis of HRV data from patients undergoing local anaesthesia (brachial plexus block)

Shafqat¹,

Pal²,

Kumari³

et al. 2011

Physiol. Meas.

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“…We have already shown that changes in percutaneous oxygen pressure (tcPO 2 ) may predict the effects of the spinal anaesthesia when combined with oxygen administration [8]. Therefore, in the present study, we studied the changes in tcPO 2 with the hypothesis that the changes in tcPO 2 may differentiate the blocked arm and non-blocked arm after the brachial plexus block.…”

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confidence: 99%

“…Blood flow may increase by vasodilation after the brachial plexus block, a phenomenon which also has been much studied [2,[4][5][6][7]. Wenger et al [4] showed that an increase of forearm blood flow by skin temperature rise was not different between the brachial plexus block and the control [4].…”

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Is the change of percutaneous oxygen pressure available to judge the effects of brachial plexus block?

Nishiyama¹

2017

Anaesthesiol Intensive Ther

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Background: To know the objective methods of the effects of the brachial plexus block, we studied the changes in percutaneous oxygen pressure (tcPO 2 ) with the hypothesis that tcPO 2 increases significantly on the blocked arm in comparison with the non-blocked arm, a phenomenon which is connected with vasodilation following the brachial plexus block. Methods: Fifteen patients scheduled for upper extremity surgery, aged 20 to 70 years, with ASA physical status I or II were included. Before anaesthesia, the electrodes used to measure tcPO 2 were put on the radial side of the forearm and upper arm of both the right and left sides (a total of 4 electrodes). Oxygen at 6 L min -1 was administered by a facial mask. Once midazolam 1-2 mg and fentanyl 50 µg had been administered intravenously, a propofol infusion was started at a dose of 2 mg kg -1 h -1 . The interscalene block was performed by means of a nerve stimulator, using 20 mL of 1% lidocaine solution combined with 20 mL of 0.75% ropivacaine solution. TcPO 2 was measured just before the block and 30 minutes after the block. Results: TcPO 2 in both forearm and upper arm significantly increased after the block in both sides namely, blocked and non-blocked. No difference was observed in tcPO 2 between the blocked side and non-blocked side. Conclusion: Changes of tcPO 2 are not useful in order to assess the effects of the interscalene block under oxygen administration.

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Phase Coherence Between Cardiovascular Oscillations in Malaria: The Basis for a Possible Diagnostic Test

Abdulhameed

Habib

McClintock

et al. 2021

Understanding Complex Systems

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We show how a non-autonomous dynamics approach using time-resolved analyses of power spectra and phase coherence can help in the noninvasive diagnosis of malaria. The work is based on studying oscillations in blood flow and the variability of the heart and respiratory frequencies. The model used assumes that the heart and respiration are two oscillatory pumps with variable frequencies and that the vascular resistance also changes in an oscillatory manner. Red blood cells circulating through the system deliver oxygen to each cell. Malaria changes the red blood cells so that this delivery is compromised. The oscillatory properties of both pumps are also affected. We quantify the latter and compare three groups of subjects: febrile malaria patients (37); non-febrile malaria patients (10); and healthy controls (51). For each subject, time series of skin blood flow, respiratory effort, cardiac activity (ECG) and skin temperature were recorded simultaneously over an interval of 30 minutes. The oscillatory components within the range 0.005 − 2 Hz were analysed and their degree of coordination throughout the cardiovascular system was assessed by wavelet phase coherence analysis. It is shown that malaria, either febrile or non-febrile, substantially reduces the coordination.

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Cutaneous sympathetic vasoconstrictor reflexes for the evaluation of interscalene brachial plexus block

Cited by 30 publications

References 18 publications

Empirical mode decomposition analysis of HRV data from patients undergoing local anaesthesia (brachial plexus block)

Empirical mode decomposition analysis of HRV data from patients undergoing local anaesthesia (brachial plexus block)

Is the change of percutaneous oxygen pressure available to judge the effects of brachial plexus block?

Phase Coherence Between Cardiovascular Oscillations in Malaria: The Basis for a Possible Diagnostic Test

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