Reduced cerebral hemodynamic response in sleep disorders: A NIRS frequency-domain study

2002 ◽  
Author(s):  
A. Michalos ◽  
L. P. Safonova ◽  
D. M. Hueber ◽  
U. Wolf ◽  
M. Wolf ◽  
...  
Keyword(s):  
Sleep Disorders ◽  
Frequency Domain ◽  
Hemodynamic Response ◽  
Cerebral Hemodynamic

Cerebral Hemodynamic Response to Short-Term Maternal Hyperoxygenation in Foetuses with Borderline Small Left Hearts

2019 ◽  
Author(s):  
Shi Zeng ◽  
Jiawei Zhou ◽  
Qichang Zhou ◽  
Qinghai Peng ◽  
Ganqiong Xu ◽  
...  
Keyword(s):  
Hemodynamic Response ◽  
Short Term ◽  
Cerebral Hemodynamic

Cerebral oxygenation changes in response to motor stimulation

1996 ◽  
Vol 81 (3) ◽  
pp. 1174-1183 ◽  
Author(s):  
H. Obrig ◽  
C. Hirth ◽  
J. G. Junge-Hulsing ◽  
C. Doge ◽  
T. Wolf ◽  
...  
Keyword(s):  
Time Course ◽  
Near Infrared ◽  
Cerebral Oxygenation ◽  
Motor Task ◽  
Hemoglobin Concentration ◽  
Hemodynamic Response ◽  
Blood Oxygenation ◽  
Initial Increase ◽  
Cerebral Hemodynamic ◽  
Course Changes

We studied cerebral hemodynamic response to a sequential motor task in 56 subjects to investigate the time course and distribution of blood oxygenation changes as monitored by near-infrared spectroscopy (NIRS). To address whether response is modulated by different performance velocities, a group of subjects (n = 12) was examined while performing the motor task at 1, 2, and 3 Hz. The results demonstrate that 1) the NIRS response reflects localized changes in cerebral hemodynamics, 2) the response, consisting of an increase in oxygenated hemoglobin concentration [oxy-Hb] and a decrease in deoxygenated hemoglobin concentration ([deoxy-Hb]), is lateralized and increases in amplitude with higher performance rates, and 3) changes in [oxy-Hb] and [deoxy-Hb] differ in time course. Changes in [oxy-Hb] are biphasic, with a fast initial increase and a pronounced poststimulus undershoot. The stimulus-associated decrease in [deoxy-Hb] is monophasic, and response latency is greater. We conclude that NIRS is able to detect even small changes in cerebral hemodynamic response to functional stimulation.

scholarly journals Cerebral hemodynamic response to short-term maternal hyperoxygenation in fetuses with borderline small left hearts

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Shi Zeng ◽  
Jiawei Zhou ◽  
Qinghai Peng ◽  
Wen Deng ◽  
Qichang Zhou
Keyword(s):  
Hemodynamic Response ◽  
Short Term ◽  
Cerebral Hemodynamic

Age-dependent cerebral hemodynamic effects of indomethacin in the newborn piglet

2004 ◽  
Vol 97 (5) ◽  
pp. 1880-1887 ◽  
Author(s):  
Derek W. Brown ◽  
David Lee ◽  
Vazhkudai S. Kumaran ◽  
Ting-Yim Lee
Keyword(s):  
Near Infrared ◽  
Cerebral Blood Volume ◽  
Ductus Arteriosus ◽  
Hemodynamic Response ◽  
Oxygen Extraction Fraction ◽  
Postnatal Life ◽  
Dependent Manner ◽  
Hemodynamic Effects ◽  
Cerebral Hemodynamic ◽  
Age Dependent

With recent discussions in the literature regarding prophylactic use of early (within the first 12 h after birth), low-dose indomethacin to reduce the incidence and severity of intraventricular hemorrhage, knowledge pertaining to the cerebral hemodynamic effects of indomethacin in this age group is of significant interest. The cerebral circulation is known to undergo significant changes during the first few days of postnatal life. In the present study, we have investigated the hypothesis that postnatal adaptive changes influence the cerebral hemodynamic response to indomethacin in an age-dependent manner. Near-infrared spectroscopy with indocyanine green was used to measure cerebral hemodynamics, cerebral metabolic rate of oxygen, and cerebral oxygen extraction fraction in 39 newborn piglets. Piglets were grouped by age and received either 0.2 mg/kg indomethacin (14 were <13 h of age and 12 were >13 h of age) or saline (8 were <13 h of age and 5 were >13 h of age) infusions. In a subgroup of indomethacin-treated piglets (9 less than and 7 greater than 13 h of age), Doppler flow ultrasound was used to diagnose and monitor the presence and persistence of patent ductus arteriosus. Age was a significant factor in the cerebral hemodynamic response to indomethacin with piglets <13 h of age exhibiting delayed increases in cerebral blood flow and cerebral blood volume at 150 min post-indomethacin infusion.

Cerebral Hemodynamic Response to CO sub 2 after Severe Head Injury

1998 ◽  
Vol 44 (3) ◽  
pp. 495-500 ◽  
Author(s):  
Adolfo Paolin ◽  
Guido Rodriguez ◽  
Michele Betetto ◽  
Giuseppe Simini
Keyword(s):  
Head Injury ◽  
Severe Head Injury ◽  
Hemodynamic Response ◽  
Cerebral Hemodynamic

CEREBRAL HEMODYNAMIC RESPONSE TO MIVACURIUM CHLORIDE

1994 ◽  
Vol 6 (4) ◽  
pp. 326
Author(s):  
M. Mallikarjuna ◽  
G. P. Lu ◽  
J. Gibson ◽  
C. Monell ◽  
I. Osborn
Keyword(s):  
Hemodynamic Response ◽  
Cerebral Hemodynamic
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