Changes in venous blood volume produced by external compression of the lower leg

1980 ◽  
Vol 18 (5) ◽  
pp. 650-656 ◽  
Author(s):  
R. B. Thirsk ◽  
R. D. Kamm ◽  
A. H. Shapiro
Keyword(s):  
Blood Volume ◽  
Venous Blood ◽  
Lower Leg ◽  
External Compression ◽  
Venous Blood Volume

scholarly journals Quantifying cerebral hypoxia by near-infrared spectroscopy tissue oximetry: the role of arterial-to-venous blood volume ratio

2017 ◽  
Vol 22 (2) ◽  
pp. 025001 ◽  
Author(s):  
Martin B. Rasmussen ◽  
Vibeke R. Eriksen ◽  
Bjørn Andresen ◽  
Simon Hyttel-Sørensen ◽  
Gorm Greisen
Keyword(s):  
Infrared Spectroscopy ◽  
Blood Volume ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Venous Blood ◽  
Volume Ratio ◽  
Cerebral Hypoxia ◽  
Venous Blood Volume ◽  
Tissue Oximetry

scholarly journals Contributions of dynamic venous blood volume versus oxygenation level changes to BOLD fMRI

NeuroImage ◽  
2012 ◽  
Vol 60 (4) ◽  
pp. 2238-2246 ◽  
Author(s):  
Xiaopeng Zong ◽  
Tae Kim ◽  
Seong-Gi Kim
Keyword(s):  
Blood Volume ◽  
Venous Blood ◽  
Volume Versus ◽  
Bold Fmri ◽  
Oxygenation Level ◽  
Venous Blood Volume

scholarly journals Influence of Resting Venous Blood Volume Fraction on Dynamic Causal Modeling and System Identifiability

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Zhenghui Hu ◽  
Pengyu Ni ◽  
Qun Wan ◽  
Yan Zhang ◽  
Pengcheng Shi ◽  
...  
Keyword(s):  
Blood Volume ◽  
Volume Fraction ◽  
Venous Blood ◽  
Causal Modeling ◽  
Dynamic Causal Modeling ◽  
Venous Blood Volume

Extrajugular pathways of human cerebral venous blood drainage assessed by duplex ultrasound

2003 ◽  
Vol 94 (5) ◽  
pp. 1802-1805 ◽  
Author(s):  
Stephan J. Schreiber ◽  
Frank Lürtzing ◽  
Rainer Götze ◽  
Florian Doepp ◽  
Randolf Klingebiel ◽  
...  
Keyword(s):  
Blood Volume ◽  
Venous Blood ◽  
Duplex Ultrasound ◽  
Venous Drainage ◽  
Volume Flow ◽  
Venous System ◽  
Jugular Veins ◽  
Ultrasound Studies ◽  
Cerebral Venous Drainage ◽  
Venous Blood Volume

Cerebral venous drainage in humans is thought to be ensured mainly via the internal jugular veins (IJVs). However, anatomic, angiographic, and ultrasound studies suggest that the vertebral venous system serves as an important alternative drainage route. We assessed venous blood volume flow in vertebral veins (VVs) and IJVs of 12 healthy volunteers using duplex ultrasound. Measurements were performed at rest and during a transient bilateral IJV and a circular neck compression. Total venous blood volume flow at rest was 766 ± 226 ml/min (IJVs: 720 ± 232, VVs: 47 ± 33 ml/min). During bilateral IJV compression, VV flow increased to 128 ± 64 ml/min. Circular neck compression, causing an additional deep cervical vein obstruction, led to a further rise in VV volume flow (186 ± 70 ml/min). As the observed flow increase did not compensate for IJV flow cessation, other parts of the vertebral venous system, like the intraspinal epidural veins and the deep cervical veins, have to be considered as additional alternative drainage pathways.

Effects of dopamine on total peripheral resistance and integrated systemic venous blood volume in dogs

1980 ◽  
Vol 75 (5) ◽  
pp. 623-634 ◽  
Author(s):  
E. Grund ◽  
E. R. Müller-Ruchholtz ◽  
F. Hauer ◽  
E. R. Lapp
Keyword(s):  
Blood Volume ◽  
Total Peripheral Resistance ◽  
Venous Blood ◽  
Peripheral Resistance ◽  
Venous Blood Volume

Measuring venous blood volume changes during activation using hyperoxia

NeuroImage ◽  
2012 ◽  
Vol 59 (4) ◽  
pp. 3266-3274 ◽  
Author(s):  
N.P. Blockley ◽  
I.D. Driver ◽  
J.A. Fisher ◽  
S.T. Francis ◽  
P.A. Gowland
Keyword(s):  
Blood Volume ◽  
Venous Blood ◽  
Volume Changes ◽  
Venous Blood Volume

The analysis of the cerebral venous blood volume in cavernous sinus using 320 row multi-detector CT

2018 ◽  
Vol 167 ◽  
pp. 11-16 ◽  
Author(s):  
Katsuhiro Mizutani ◽  
Masahiro Toda ◽  
Yumi Yajima ◽  
Takenori Akiyama ◽  
Hirokazu Fujiwara ◽  
...  
Keyword(s):  
Blood Volume ◽  
Cavernous Sinus ◽  
Venous Blood ◽  
Venous Blood Volume

Computer simulation of O2 transport and utilization mechanisms at the onset of exercise

1992 ◽  
Vol 73 (6) ◽  
pp. 2382-2388 ◽  
Author(s):  
J. E. Cochrane ◽  
R. L. Hughson
Keyword(s):  
Blood Volume ◽  
Metabolic Response ◽  
Phase 1 ◽  
Venous Blood ◽  
Real Data ◽  
Lag Time ◽  
Single Subject ◽  
O2 Transport ◽  
Alveolar Level ◽  
Venous Blood Volume

During transitions in work rate, O2 uptake (VO2) kinetics at the working tissue level might be rate limited by O2 transport and/or by O2 utilization. A computer model with parallel working and non-working tissue compartments, connected to an ideal lung by a variable-sized venous blood volume, was developed to study this. The time constant for working tissue O2 demand (tau T) was set by a first-order linear metabolic response. The model attempted to replicate the VO2 response at the alveolar level of a single subject performing step transitions on a cycle ergometer from 25 to 105 W [total lag time (equivalent to 63% increase above baseline) = 40.2 s]. Measured cardiac output kinetics (total lag time = 44.1 s) were used as a model parameter. Blood flow to the nonworking tissue (QNW) was kept constant at 4.5 or 5.0 l/min. A critical PO2 of 20 Torr was set, and the Bohr effect on the O2-hemoglobin dissociation curve was included. The “best” simulation had tau T = 36 s, QNW = 4.5 l/min, and venous blood volume = 2 liters and was not O2 transport limited. The approximation to the real data was good in all but the phase 1 response, where the model underpredicted the measured response. However, when QNW was increased to 5.0 l/min, the model was O2 transport limited; yet the predicted VO2 response at the alveolar level was not notably different from the subject's data.(ABSTRACT TRUNCATED AT 250 WORDS)

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