Search results for "Cerebrovascular autoregulation"

showing 3 items of 3 documents

Categorizing the Role of Respiration in Cardiovascular and Cerebrovascular Variability Interactions

2022

Objective: Respiration disturbs cardiovascular and cerebrovascular controls but its role is not fully elucidated. Methods: Respiration can be classified as a confounder if its observation reduces the strength of the causal relationship from source to target. Respiration is a suppressor if the opposite situation holds. We prove that a confounding/suppression (C/S) test can be accomplished by evaluating the sign of net redundancy/synergy balance in the predictability framework based on multivariate autoregressive modelling. In addition, we suggest that, under the hypothesis of Gaussian processes, the C/S test can be given in the transfer entropy decomposition framework as well. Experimental p…

AdultMalePhysiologyBiomedical EngineeringsynergyBlood Pressurecardiac neural controlYoung Adulthead-up tiltHeart RateHumansArterial PressureAnesthesiaPropofolAgedMultivariate autoregressive modelredundancyRespirationcerebrovascular autoregulationautonomic nervous systemheart rate variabilityMediationtransfer entropyHeartIndexesMiddle Agedsuppressiongeneral anesthesiapredictability decompositionconfoundingCerebrovascular CirculationSettore ING-INF/06 - Bioingegneria Elettronica e Informaticaautonomic nervous system; cardiac neural control; cerebrovascular autoregulation; confounding; general anesthesia; head-up tilt; heart rate variability; Multivariate autoregressive model; predictability decomposition; redundancy; suppression; synergy; transfer entropy;ProtocolsRegulation
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Serial Measurement of Static and Dynamic Cerebrovascular Autoregulation After Brain Injury

2011

In patients with neuronal injury, the knowledge of the status of cerebrovascular autoregulation can help to optimize the management of the cerebral perfusion pressure. This study characterizes dynamic and static cerebrovascular autoregulation during the first 7 days after severe traumatic brain injury or intracranial hemorrhage.After approval from the IRB, 16 patients were studied. Cerebral blood flow velocity (CBFV) was measured daily for the assessment of dynamic (10 patients) and static (16 patients) cerebrovascular autoregulation in both the middle cerebral arteries using the transcranial Doppler sonography. Dynamic cerebrovascular autoregulation (dAR) was measured using the cuff-deflat…

AdultMaleUltrasonography Doppler TranscranialBlood PressureYoung AdultText miningHomeostasisHumansMedicinecardiovascular diseasesCerebral perfusion pressureAgedbusiness.industryMiddle AgedAnesthesiology and Pain Medicinenervous systemCerebrovascular autoregulationBrain InjuriesCerebrovascular CirculationAnesthesiaFemaleSurgeryNeurology (clinical)UltrasonographybusinessAlgorithmsJournal of Neurosurgical Anesthesiology
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Usefulness of Cerebral Oximetry in TBI by NIRS

2021

Measurement of cerebral oximetry by near-infrared spectroscopy provides continuous and non-invasive information about the oxygen saturation of haemoglobin in the central nervous system. This is especially important in the case of patients with traumatic brain injuries. Monitoring of cerebral oximetry in these patients could allow for the diagnosis of inadequate cerebral oxygenation caused by disturbances in cerebral blood flow. It could enable identification of episodes of hypoxia and cerebral ischemia. Continuous bedside measurement could facilitate the rapid diagnosis of intracranial bleeding or cerebrovascular autoregulation disorders and accelerate the implementation of treatment. Howev…

medicine.medical_specialtynear-infrared spectroscopyTraumatic brain injuryCentral nervous systemintracranial pressureIschemiaReview03 medical and health sciences0302 clinical medicineInternal medicinemedicineCerebral oximetryIntracranial pressureOxygen saturation (medicine)business.industrytraumatic brain injurycerebrovascular autoregulationRcerebral oximetry030208 emergency & critical care medicineGeneral MedicineHypoxia (medical)medicine.diseasemedicine.anatomical_structureCerebral blood flowCardiologyMedicinemedicine.symptombusiness030217 neurology & neurosurgeryJournal of Clinical Medicine
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