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Increased inspiratory resistance affects the dynamic relationship between blood pressure changes and subarachnoid space width oscillations.
PLoS One
September 2017
Department of Hypertension and Diabetology, Medical University of Gdansk, Gdansk, Poland.
Background And Objective: Respiration 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.
Methods: Experiments 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).
Wavelet transform analysis to assess oscillations in pial artery pulsation at the human cardiac frequency.
Microvasc Res
May 2015
Department of Hypertension and Diabetology, Medical University of Gdansk, Gdansk, Poland; International Clinical Research Center, St. Anne's University Hospital in Brno (FNUSA), Brno, Czech Republic.
Pial artery adjustments to changes in blood pressure (BP) may last only seconds in humans. Using a novel method called near-infrared transillumination backscattering sounding (NIR-T/BSS) that allows for the non-invasive measurement of pial artery pulsation (cc-TQ) in humans, we aimed to assess the relationship between spontaneous oscillations in BP and cc-TQ at frequencies between 0.5 Hz and 5 Hz.
View Article and Find Full Text PDFAssessing changes in pial artery resistance and subarachnoid space width using a non-invasive method in healthy humans during the handgrip test.
Acta Neurobiol Exp (Wars)
August 2012
Institute of Human Physiology, Faculty of Health Sciences, Medical University of Gdansk, Poland.
The aim of this study was to assess the influence of the handgrip test (HGT) on: (1) pial artery pulsation (cc-TQ), (2) subarachnoid space (SAS) width (sas-TQ) and (3) the relationship between peripheral blood pressure (BP), heart rate (HR), cerebral blood flow velocity (CBFV), resistive index (RI), cc-TQ and sas-TQ. The study was performed on 29 healthy volunteers (11 men and 18 women) with a mean age of 29.3 ± SE 4.
View Article and Find Full Text PDFEffects of acute hypercapnia on the amplitude of cerebrovascular pulsation in humans registered with a non-invasive method.
Microvasc Res
March 2012
Institute of Human Physiology, Faculty of Health Sciences, Medical University of Gdansk, Tuwima Str. 15, 80-210 Gdansk, Poland.
Aim: The aim of the study was to assess non-invasively the effects of acute hypercapnia on the amplitude of cerebrovascular pulsation (CVP) in humans.
Methods: Experiments were carried out in four male volunteers aged 25, 26, 31 and 49. Changes in blood flow through the pial arteries were induced using two interventions: (A) breathing a gas mixture containing 5% CO(2) for 2 minutes and (B) intravenous administration of 1g acetazolamide.
Neuroimaging and neurodevelopmental outcomes in preterm infants.
Semin Perinatol
February 2008
Division of Neonatal and Developmental Medicine, Stanford University School of Medicine, Palo Alto, CA 94304, USA.
Imaging of the preterm infant brain has advanced dramatically beyond the earliest era of transillumination. Computed tomography (CT), a crucial innovation during the early 1970s, allowed noninvasive visualization of intracerebral lesions, particularly hemorrhage. The capability to document brain injury in the preterm infant led to better clarification of links to developmental outcomes.
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