Results 81 to 90 of about 42,335 (283)

Effects of the angle of head‐down tilt on dynamic cerebral autoregulation during combined exposure to cephalad fluid shift and mild hypercapnia

Experimental Physiology, EarlyView.
Abstract Astronauts experience combined exposure to a cephalad fluid shift and mild hypercapnia during space missions, potentially contributing to health problems. Such combined exposure may weaken dynamic cerebral autoregulation. The magnitude of cephalad fluid shift varies between individuals, and dynamic cerebral autoregulation may be affected more ...
Tomokazu Kato, Yojiro Ogawa, Ken‐ichi Iwasaki   +2 more
wiley   +1 more source

Reproducibility of Transcranial Doppler ultrasound in the middle cerebral artery

Cardiovascular Ultrasound, 2018
Background Transcranial Doppler ultrasound remains the only imaging modality that is capable of real-time measurements of blood flow velocity and microembolic signals in the cerebral circulation.
Jakub Kaczynski, Rachel Home, Karen Shields, Matthew Walters, William Whiteley, Joanna Wardlaw, David E. Newby   +6 more
doaj   +1 more source

Non-invasive Monitoring of Intracranial Pressure Using Transcranial Doppler Ultrasonography: Is It Possible? [PDF]

, 2016
Although intracranial pressure (ICP) is essential to guide management of patients suffering from acute brain diseases, this signal is often neglected outside the neurocritical care environment.
Bohdanowicz, M, Cabeleira, M, Cabella, B, Cardim, Danilo, Czosnyka, M, Donnelly, J, Liu, X, Robba, C, Schmidt, B, Smielewski, P   +9 more
core   +2 more sources

Regional changes in cerebral blood flow between the upright and supine posture and over 3 days of bed rest

Experimental Physiology, EarlyView.
Abstract A reduction in cerebral blood flow (CBF) has been observed during spaceflight and bed rest. We aimed to examine the magnitude and regional heterogeneity of the decrease in CBF during bed rest compared to posture changes on Earth. Seventeen participants (age, 29 ± 9 years, 7 females) were studied in the upright and supine posture and over 3 ...
Carmen Possnig, Kyohei Marume, Gautam Babu, Sylvan L. J. E. Janssen, Christopher M. Hearon Jr, Katrin A. Dias, Satyam Sarma, Justin S. Lawley, Benjamin D. Levine   +8 more
wiley   +1 more source

Cerebral blood flow autoregulation is impaired in schizophrenia [PDF]

, 2017
Patients with schizophrenia have a higher risk of cardiovascular diseases and higher mortality from them than does the general population; however, the underlying mechanism remains unclear.
al, et, Ku, Hsiao-Lun, Lane, Timothy
core  

Cerebrovascular pulsatility following long duration spaceflight is associated with changes in pulse pressure and carotid artery stiffness

Experimental Physiology, EarlyView.
Abstract Central artery stiffening increases the haemodynamic pulsations transmitted downstream towards target organs, including the brain. While recent evidence suggests that long duration spaceflight is associated with reduced common carotid artery (CCA) distensibility, cerebrovascular pulsatility has not been extensively characterized in astronauts.
Roxanne Fournier, Danielle K. Greaves, J. Kevin Shoemaker, Philippe Arbeille, Richard L. Hughson, Andrew D. Robertson   +5 more
wiley   +1 more source

Quantification of the cerebral pressure–flow relationship directional sensitivity: Reliability of shorter repeated squat–stand durations

Experimental Physiology, EarlyView.
Abstract The magnitude of changes in middle cerebral artery mean blood velocity (MCAv) is attenuated when mean arterial pressure (MAP) increases compared with when MAP decreases. This directional sensitivity has been characterized using a time‐corrected ratio calculated on MCAv and MAP changes induced by repeated squat–stands (RSS) at 0.05 and 0.10 Hz ...
Lawrence Labrecque, Marc‐Antoine Roy, Shahrzad Soleimani Dehnavi, Mahmoudreza Taghizadeh, Joel S. Burma, Jonathan D. Smirl, Patrice Brassard   +6 more
wiley   +1 more source

Intraoperative Neurophysiological Monitoring for Endoscopic Endonasal Approaches to the Skull Base: A Technical Guide. [PDF]

, 2016
Intraoperative neurophysiological monitoring during endoscopic, endonasal approaches to the skull base is both feasible and safe. Numerous reports have recently emerged from the literature evaluating the efficacy of different neuromonitoring tests during
Doan, Adam T., Evans, James J., Kenning, Tyler J., Lober, Robert M., Matsumoto, Craig I., Singh, Harminder, Vogel, Richard W.   +6 more
core   +3 more sources

Uncovering the impact of the cardiovascular system on cerebrovascular health using MRI

Experimental Physiology, EarlyView.
Abstract Human cerebrovasculature is finely tuned to enable local changes in blood flow to meet the brain's demands, whilst protecting the brain from systemic changes in blood pressure, both acutely during a heartbeat and chronically over time. This review summarises cerebrovascular structure and function, their role in disease and neurodegeneration ...
Ian D. Driver, Kevin Murphy
wiley   +1 more source

Konsep Dasar Transcranial Doppler (TCD) untuk Neurocritical Care

Jurnal Neuroanestesi Indonesia, 2017
Transcranial Doppler merupakan salah satu aplikasi dari penggunaan ultrasonografi (USG) sehingga bersifat noninvasif dan mobile. Untuk dapat menggunakan TCD dengan baik maka diperlukan pemahaman mengenai doppler effect yang merupakan dasar perhitungan ...
Ida Bagus Krisna J. Sutawan, Siti Chasnak Saleh, Tatang Bisri   +2 more
doaj   +1 more source