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Autoregulation preterm

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https://www.readbyqxmd.com/read/27603562/near-infrared-spectroscopy-for-detection-of-a-significant-patent-ductus-arteriosus
#1
Valerie Y Chock, Laura A Rose, Jeanet V Mante, Rajesh Punn
BACKGROUND: Near-infrared spectroscopy (NIRS) may assist with characterization of a hemodynamically significant patent ductus arteriosus (hsPDA) by measuring cerebral and renal saturation (Csat and Rsat) levels. We hypothesized that Csat and Rsat in preterm infants with an hsPDA would be decreased compared to those with no PDA or non-significant PDA. METHODS: This non a-priori designed study retrospectively investigated clinical and ECHO characteristics of preterm infants <29 weeks gestation who underwent routine NIRS monitoring...
September 7, 2016: Pediatric Research
https://www.readbyqxmd.com/read/27104347/the-effect-of-maternal-antihypertensive-drugs-on-the-cerebral-renal-and-splanchnic-tissue-oxygen-extraction-of-preterm-neonates
#2
Anne E Richter, Trijntje E Schat, Koenraad N J A Van Braeckel, Sicco A Scherjon, Arend F Bos, Elisabeth M W Kooi
BACKGROUND: Drugs with antihypertensive action are frequently used in obstetrics for the treatment of preeclampsia (labetalol) and tocolysis (nifedipine) or for neuroprotection (MgSO4), and may affect the hemodynamics of preterm born neonates. OBJECTIVE: The aim of this study was to assess whether maternal antihypertensive drugs affect multisite oxygenation levels of the neonate. METHODS: Eighty preterm neonates of ≤32 weeks of gestational age were monitored using near-infrared spectroscopy...
2016: Neonatology
https://www.readbyqxmd.com/read/26782253/can-the-assessment-of-spontaneous-oscillations-by-near-infrared-spectrophotometry-predict-neurological-outcome-of-preterm-infants
#3
André Stammwitz, Kurt von Siebenthal, Hans U Bucher, Martin Wolf
The aim was to assess the correlation between cerebral autoregulation and outcome. Included were 31 preterm infants, gestational age 26 1/7 to 32 2/7 and <24 h life. Coherence between cerebral total haemoglobin (tHb) or oxygenation index (OI) measured by near-infrared spectrophotometry (NIRS) and systemic heart rate (HR) or arterial blood pressure (MAP) was calculated as a measure of autoregulation. In contrast to previous studies, low coherences in the first 24 h were significantly associated with intraventricular haemorrhage, death or abnormal neurodevelopmental outcome at 18 months or later...
2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/26782252/characterizing-fluctuations-of-arterial-and-cerebral-tissue-oxygenation-in-preterm-neonates-by-means-of-data-analysis-techniques-for-nonlinear-dynamical-systems
#4
Stefan Kleiser, Marcin Pastewski, Tharindi Hapuarachchi, Cornelia Hagmann, Jean-Claude Fauchère, Ilias Tachtsidis, Martin Wolf, Felix Scholkmann
The cerebral autoregulatory state as well as fluctuations in arterial (SpO2) and cerebral tissue oxygen saturation (StO2) are potentially new relevant clinical parameters in preterm neonates. The aim of the present study was to test the investigative capabilities of data analysis techniques for nonlinear dynamical systems, looking at fluctuations and their interdependence. StO2, SpO2 and the heart rate (HR) were measured on four preterm neonates for several hours. The fractional tissue oxygenation extraction (FTOE) was calculated...
2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/26711678/dopamine-treatment-during-acute-hypoxia-is-neuroprotective-in-the-developing-sheep-brain
#5
N Brew, A Azhan, I den Heijer, M Boomgardt, G I Davies, I Nitsos, S L Miller, A M Walker, D W Walker, F Y Wong
Dopamine is often used to treat hypotension in preterm infants; these infants are at risk of developing brain injury due to impaired autoregulation and cerebral hypoperfusion. However the effects of dopamine on the immature brain under conditions of cerebral hypoxia are not known. We hypothesized that pretreatment with dopamine would protect the immature brain from injury caused by cerebral hypoxia. Preterm fetal sheep were used to determine the effects of intravenous dopamine on hypoxia-induced brain injury...
March 1, 2016: Neuroscience
https://www.readbyqxmd.com/read/26571222/a-novel-method-for-assessing-cerebral-autoregulation-in-preterm-infants-using-transfer-function-analysis
#6
Zachary A Vesoulis, Steve M Liao, Shamik B Trivedi, Nathalie El Ters, Amit M Mathur
BACKGROUND: Autoregulatory dysfunction is an important contributor to brain injury in premature infants, particularly intraventricular hemorrhage (IVH). The autoregulatory system acts as a filter that dampens the systemic blood flow to follow a normal cerebral perfusion profile. METHODS: Simultaneous arterial blood pressure and cerebral near-infrared spectroscopy (NIRS) data were collected from infants born before 28 wk estimated gestational age. The resulting data were preprocessed and then divided into nonoverlapping 20-min epochs...
March 2016: Pediatric Research
https://www.readbyqxmd.com/read/26539666/new-developments-in-cerebral-blood-flow-autoregulation-analysis-in-preterm-infants-a-mechanistic-approach
#7
Joan Riera, Fernando Cabañas, José Javier Serrano, Rosario Madero, Adelina Pellicer
BACKGROUND: Impaired autoregulation capacity implies that changes in cerebral perfusion follow changes in blood pressure; however, no analytical method has explored such a signal causality relationship in infants. We sought to develop a method to assess cerebral autoregulation from a mechanistic point of view and explored the predictive capacity of the method to classify infants at risk for adverse outcomes. METHODS: The partial directed coherence (PDC) method, which considers synchronicity and directionality of signal dependence across frequencies, was used to analyze the relationship between spontaneous changes in mean arterial pressure (MAP) and the cerebral tissue oxygenation index (TOI)...
March 2016: Pediatric Research
https://www.readbyqxmd.com/read/26539662/fast-doppler-as-a-novel-bedside-measure-of-cerebral-perfusion-in-preterm-infants
#8
Eric S Peeples, Edin Mehic, Pierre D Mourad, Sandra E Juul
BACKGROUND: Altered cerebral perfusion from impaired autoregulation may contribute to the morbidity and mortality associated with premature birth. We hypothesized that fast Doppler imaging could provide a reproducible bedside estimation of cerebral perfusion and autoregulation in preterm infants. METHODS: This is a prospective pilot study using fast Doppler ultrasound to assess blood flow velocity in the basal ganglia of 19 subjects born at 26-32 wk gestation...
February 2016: Pediatric Research
https://www.readbyqxmd.com/read/26383883/assessing-cerebrovascular-autoregulation-in-infants-with-necrotizing-enterocolitis-using-near-infrared-spectroscopy
#9
Trijntje E Schat, Michelle E van der Laan, Maarten Schurink, Jan B F Hulscher, Christian V Hulzebos, Arend F Bos, Elisabeth M W Kooi
BACKGROUND: We assessed cerebrovascular autoregulation (CAR) in preterm infants with definite necrotizing enterocolitis (NEC), Bell's stage 2 or 3, and infants without NEC, using near-infrared spectroscopy. We hypothesized that CAR would be more often impaired in infants with NEC compared with infants without NEC. METHODS: We measured cerebral regional tissue oxygen saturation, arterial oxygen saturation, and mean arterial blood pressure (MABP) during 48 h. We calculated the correlation between cerebral fractional tissue oxygen extraction and MABP for each patient...
January 2016: Pediatric Research
https://www.readbyqxmd.com/read/26381128/borderline-hypotension-how-does-it-influence-cerebral-regional-tissue-oxygenation-in-preterm-infants
#10
Corinna Binder-Heschl, Berndt Urlesberger, Bernhard Schwaberger, Martin Koestenberger, Gerhard Pichler
AIM: To monitor cerebral regional tissue oxygenation (crSO2) of preterm infants continuously and to analyze the influence of arterial hypotension on crSO2. METHODS: In this prospective, observational study crSO2, peripheral oxygen saturation (SpO2), heart rate (HR) and mean arterial blood pressure (MABP) were monitored continuously for 24 h, starting within the first 6 h after birth. Furthermore, cerebral fractional tissue oxygen extraction (cFTOE) was calculated...
2016: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/25806662/cerebral-autoregulation-in-the-preterm-newborn-using-near-infrared-spectroscopy-a-comparison-of-time-domain-and-frequency-domain-analyses
#11
Vibeke R Eriksen, Gitte H Hahn, Gorm Greisen
The aim was to compare two conventional methods used to describe cerebral autoregulation (CA): frequency-domain analysis and time-domain analysis. We measured cerebral oxygenation (as a surrogate for cerebral blood flow) and mean arterial blood pressure (MAP) in 60 preterm infants. In the frequency domain, outcome variables were coherence and gain, whereas the cerebral oximetry index (COx) and the regression coefficient were the outcome variables in the time domain. Correlation between coherence and COx was poor...
March 2015: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/25542161/impact-of-patent-ductus-arteriosus-and-subsequent-therapy-with-ibuprofen-on-the-release-of-s-100b-and-oxidative-stress-index-in-preterm-infants
#12
Nihat Demir, İbrahim Ece, Erdal Peker, Sultan Kaba, Lokman Ustyol, Ragıp Balahoroğlu, Oğuz Tuncer
BACKGROUND: Hemodynamically significant patent ductus arteriosus (hsPDA) leads to injury in tissues/organs by reducing perfusion of organs and causing oxidative stress. The purpose of this study was to evaluate the oxidant/antioxidant status in preterm infants with hsPDA by measuring the total antioxidant capacity and total oxidant status and to assess neuronal damage due to oxidant stress related to hsPDA. MATERIAL AND METHODS: This prospective study included 37 low-birth-weight infants with echocardiographically diagnosed hsPDA treated with oral ibuprofen and a control group of 40 infants without PDA...
2014: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/25266994/dopamine-therapy-is-associated-with-impaired-cerebral-autoregulation-in-preterm-infants
#13
Vibeke R Eriksen, Gitte H Hahn, Gorm Greisen
AIM: Hypotension is a common problem in newborn infants and is associated with increased mortality and morbidity. Dopamine is the most commonly used antihypotensive drug therapy, but has never been shown to improve neurological outcomes. This study tested our hypothesis that dopamine affects cerebral autoregulation (CA). METHODS: Near-infrared spectroscopy was used to measure the cerebral oxygenation index in 60 very preterm infants, and mean arterial blood pressure was monitored towards the end of their first day of life...
December 2014: Acta Paediatrica
https://www.readbyqxmd.com/read/25152257/cerebral-autoregulation-in-preterm-infants-how-to-measure-it-and-why-care
#14
EDITORIAL
Gorm Greisen
No abstract text is available yet for this article.
November 2014: Journal of Pediatrics
https://www.readbyqxmd.com/read/25126111/mathematical-modelling-of-cerebral-blood-circulation-and-cerebral-autoregulation-towards-preventing-intracranial-hemorrhages-in-preterm-newborns
#15
Renée Lampe, Nikolai Botkin, Varvara Turova, Tobias Blumenstein, Ana Alves-Pinto
Impaired cerebral autoregulation leads to fluctuations in cerebral blood flow, which can be especially dangerous for immature brain of preterm newborns. In this paper, two mathematical models of cerebral autoregulation are discussed. The first one is an enhancement of a vascular model proposed by Piechnik et al. We extend this model by adding a polynomial dependence of the vascular radius on the arterial blood pressure and adjusting the polynomial coefficients to experimental data to gain the autoregulation behavior...
2014: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/24897391/postnatal-kidney-maturation-regulates-renal-artery-myogenic-constriction
#16
Hitesh Soni, Randal K Buddington, Adebowale Adebiyi
AIM: Intravascular pressure-induced vasoconstriction (myogenic constriction) is central to renal blood flow autoregulation. At term, kidney maturation is functionally incomplete. Premature neonates are at risk of kidney dysfunction. However, it is unclear whether renal artery myogenic constriction is altered after preterm birth. Here, we compared renal artery myogenic constriction in full-term and preterm pigs during the first week of life. METHODS: We investigated myogenic constriction in small interlobular arteries isolated from the kidneys of pigs delivered at term and at 91% of term (with and without 96 h of neonatal intensive care)...
January 2015: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/24844816/heart-rate-passivity-of-cerebral-tissue-oxygenation-is-associated-with-predictors-of-poor-outcome-in-preterm-infants
#17
S Mitra, M Czosnyka, P Smielewski, H O'Reilly, K Brady, T Austin
AIM: Near-infrared spectroscopy (NIRS) and transcranial Doppler (TCD) allow non-invasive assessment of cerebral haemodynamics. We assessed cerebrovascular reactivity in preterm infants by investigating the relationship between NIRS- and TCD-derived indices and correlating them with severity of clinical illness. METHODS: We recorded the NIRS-derived cerebral tissue oxygenation index (TOI) and TCD-derived flow velocity (Fv), along with other physiological variables...
September 2014: Acta Paediatrica
https://www.readbyqxmd.com/read/24685437/non-invasive-mri-measurements-of-venous-oxygenation-oxygen-extraction-fraction-and-oxygen-consumption-in-neonates
#18
J B De Vis, E T Petersen, T Alderliesten, F Groenendaal, L S de Vries, F van Bel, M J N L Benders, J Hendrikse
BACKGROUND AND PURPOSE: Brain oxygen consumption reflects neuronal activity and can therefore be used to investigate brain development or neuronal injury in neonates. In this paper we present the first results of a non-invasive MRI method to evaluate whole brain oxygen consumption in neonates. MATERIALS AND METHODS: For this study 51 neonates were included. The T1 and T2 of blood in the sagittal sinus were fitted using the 'T2 prepared tissue relaxation inversion recovery' pulse sequence (T2-TRIR)...
July 15, 2014: NeuroImage
https://www.readbyqxmd.com/read/24349256/cerebral-autoregulation-is-minimally-influenced-by-the-superior-cervical-ganglion-in-two-week-old-lambs-and-absent-in-preterm-lambs-immediately-following-delivery
#19
Adam J Czynski, Michael H Terry, Douglas D Deming, Gordon G Power, John N Buchholz, Arlin B Blood
Cerebral vessels in the premature newborn brain are well supplied with adrenergic nerves, stemming from the superior cervical ganglia (SCG), but their role in regulation of blood flow remains uncertain. To test this function twelve premature or two-week-old lambs were instrumented with laser Doppler flow probes in the parietal cortices to measure changes in blood flow during changes in systemic blood pressure and electrical stimulation of the SCG. In lambs delivered prematurely at ∼129 days gestation cerebral perfusion and driving pressure demonstrated a direct linear relationship throughout the physiologic range, indicating lack of autoregulation...
2013: PloS One
https://www.readbyqxmd.com/read/24252570/cerebellar-hemorrhagic-injury-in-premature-infants-occurs-during-a-vulnerable-developmental-period-and-is-associated-with-wider-neuropathology
#20
Krista M Haines, Wei Wang, Christopher R Pierson
BACKGROUND: Cerebellar hemorrhagic injury (CHI) is being recognized more frequently in premature infants. However, much of what we know about CHI neuropathology is from autopsy studies that date back to a prior era of neonatal intensive care. To update and expand our knowledge of CHI we reviewed autopsy materials and medical records of all live-born preterm infants (<37 weeks gestation) autopsied at our institution from 1999-2010 who had destructive hemorrhagic injury to cerebellar parenchyma (n = 19) and compared them to matched non-CHI controls (n = 26)...
2013: Acta Neuropathologica Communications
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