scholarly journals Pattern of respiratory-induced changes in fingertip blood volume measured by light transmission

2011 ◽  
Vol 04 (08) ◽  
pp. 529-534 ◽  
Author(s):  
Meir Nitzan ◽  
Daniel Dayan ◽  
Eran Shalom ◽  
Yuval Slovik ◽  
Alan Murray
Keyword(s):  
Blood Volume ◽  
Light Transmission ◽  
Induced Changes

scholarly journals Measurements of Photo-Induced Changes in Conjugated Polymers

1991 ◽  
Vol 228 ◽  
Author(s):  
Carleton H. Seager ◽  
Michael B. Sinclair ◽  
D. Mc Branch ◽  
A. J. Heeger ◽  
G. L. Baker
Keyword(s):  
Absorption Spectra ◽  
Light Transmission ◽  
Pump Light ◽  
General Shape ◽  
Experimental Conditions ◽  
Photothermal Deflection Spectroscopy ◽  
Highly Sensitive ◽  
Infra Red ◽  
Transmission Measurements ◽  
Induced Changes

ABSTRACTWe have used the highly sensitive technique of Photothermal Deflection Spectroscopy (PDS) to measure changes in the infra-red absorption spectra of MEHPPV, P3HT and Polydiacetylene-4BCMU induced by pumping these polymers with light above the π - π* transition energy. In contrast to previous chopped light transmission measurements of these effects, the PDS technique can directly measure the buildup or decay of the absorption coefficient, m, on the time scale of seconds to days. In the case of MEHPPV we observe that above-gap light causes the appearance of a broad infra-red peak in α, which continues to grow-in hours after the pump light is first applied. For this polymer the general shape of the absorption spectra in the unpumped state mimics the photo-induced changes, suggesting that remnant photo-induced states determine the maximum transparency observed under normal experimental conditions. For P3HT and to a lesser extent, MEHPPV, we also observe irreversible photo-induced absorption components which we tentatively identify with photo-induced oxidation of the polymer matrix.

Exercise-Induced Changes of Pulmonary Blood Volume in Patients with Uncomplicated Myocardial Infarction

1988 ◽  
Vol 2 (4-5) ◽  
pp. 189-194
Author(s):  
Imad M. Al-Khawaja ◽  
Erwin A. Rodrigues ◽  
Avijit Lahiri ◽  
Edward B. Raftery
Keyword(s):  
Myocardial Infarction ◽  
Blood Volume ◽  
Pulmonary Blood Volume ◽  
Exercise Induced ◽  
Induced Changes

Susceptibility Contrast Imaging of CO2-Induced Changes in the Blood Volume of the Human Brain

1996 ◽  
Vol 37 (5) ◽  
pp. 813-822 ◽  
Author(s):  
E. Rostrup ◽  
H. B. W. Larsson ◽  
P. B. Toft ◽  
K. Garde ◽  
P. B. Ring ◽  
...  
Keyword(s):  
Human Brain ◽  
Blood Volume ◽  
Contrast Imaging ◽  
Susceptibility Contrast ◽  
Induced Changes

scholarly journals Hemodialysis-induced changes in hematocrit, hemoglobin and total protein: Implications for relative blood volume monitoring

PLoS ONE ◽  
2019 ◽  
Vol 14 (8) ◽  
pp. e0220764
Author(s):  
Leszek Pstras ◽  
Malgorzata Debowska ◽  
Alicja Wojcik-Zaluska ◽  
Wojciech Zaluska ◽  
Jacek Waniewski
Keyword(s):  
Blood Volume ◽  
Total Protein ◽  
Relative Blood Volume ◽  
Induced Changes

scholarly journals Effect of PEEP, blood volume, and inspiratory hold maneuvers on venous return

2016 ◽  
Vol 311 (3) ◽  
pp. H794-H806 ◽  
Author(s):  
David Berger ◽  
Per W. Moller ◽  
Alberto Weber ◽  
Andreas Bloch ◽  
Stefan Bloechlinger ◽  
...  
Keyword(s):  
Blood Volume ◽  
Venous Return ◽  
Vena Cava ◽  
Balloon Occlusion ◽  
Right Atrial ◽  
Airway Occlusion ◽  
Volume State ◽  
The Right ◽  
Induced Changes ◽  
Artery Flow

According to Guyton's model of circulation, mean systemic filling pressure (MSFP), right atrial pressure (RAP), and resistance to venous return (RVR) determine venous return. MSFP has been estimated from inspiratory hold-induced changes in RAP and blood flow. We studied the effect of positive end-expiratory pressure (PEEP) and blood volume on venous return and MSFP in pigs. MSFP was measured by balloon occlusion of the right atrium (MSFPRAO), and the MSFP obtained via extrapolation of pressure-flow relationships with airway occlusion (MSFPinsp_hold) was extrapolated from RAP/pulmonary artery flow (QPA) relationships during inspiratory holds at PEEP 5 and 10 cmH2O, after bleeding, and in hypervolemia. MSFPRAO increased with PEEP [PEEP 5, 12.9 (SD 2.5) mmHg; PEEP 10, 14.0 (SD 2.6) mmHg, P = 0.002] without change in QPA [2.75 (SD 0.43) vs. 2.56 (SD 0.45) l/min, P = 0.094]. MSFPRAO decreased after bleeding and increased in hypervolemia [10.8 (SD 2.2) and 16.4 (SD 3.0) mmHg, respectively, P < 0.001], with parallel changes in QPA. Neither PEEP nor volume state altered RVR ( P = 0.489). MSFPinsp_hold overestimated MSFPRAO [16.5 (SD 5.8) vs. 13.6 (SD 3.2) mmHg, P = 0.001; mean difference 3.0 (SD 5.1) mmHg]. Inspiratory holds shifted the RAP/QPA relationship rightward in euvolemia because inferior vena cava flow (QIVC) recovered early after an inspiratory hold nadir. The QIVC nadir was lowest after bleeding [36% (SD 24%) of preinspiratory hold at 15 cmH2O inspiratory pressure], and the QIVC recovery was most complete at the lowest inspiratory pressures independent of volume state [range from 80% (SD 7%) after bleeding to 103% (SD 8%) at PEEP 10 cmH2O of QIVC before inspiratory hold]. The QIVC recovery thus defends venous return, possibly via hepatosplanchnic vascular waterfall.

Furosemide-induced changes in plasma and blood volume of horses

1991 ◽  
Vol 14 (4) ◽  
pp. 411-417 ◽  
Author(s):  
K. W. HINCHCLIFF ◽  
K. H. McKEEVER ◽  
W. W. MUIR
Keyword(s):  
Blood Volume ◽  
Induced Changes

scholarly journals Alcohol-Induced Changes in Cerebral Blood Flow and Cerebral Blood Volume in Social Drinkers

2012 ◽  
Vol 48 (2) ◽  
pp. 160-165 ◽  
Author(s):  
Hilde Gundersen ◽  
Heidi van Wageningen ◽  
Renate Grüner
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Blood Volume ◽  
Cerebral Blood Volume ◽  
Social Drinkers ◽  
Induced Changes
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