Simultaneous Assessment of Microvascular Oxygen Saturation and Laser-Doppler Flow in Gastric Mucosa

2003 ◽  
pp. 47-53 ◽  
Author(s):  
Thomas W. L. Scheeren ◽  
Lothar A. Schwarte ◽  
Artur Fournell
Keyword(s):  
Gastric Mucosa ◽  
Oxygen Saturation ◽  
Laser Doppler ◽  
Laser Doppler Flow ◽  
Doppler Flow ◽  
Simultaneous Assessment

Laser Doppler Flow-Meter Assessment of Iontophoretically Applied Norepinephrine on Human Finger Skin Circulation

1986 ◽  
Vol 87 (5) ◽  
pp. 634-636 ◽  
Author(s):  
Lars Erik Lindblad ◽  
Lena Ekenvall ◽  
Klas Ancker ◽  
Håkan Rohman ◽  
P Åke Öberg
Keyword(s):  
Laser Doppler ◽  
Flow Meter ◽  
Laser Doppler Flow ◽  
Doppler Flow ◽  
Skin Circulation ◽  
Human Finger ◽  
Finger Skin

Increased laser Doppler flow in skin tumors corresponds to elevated vessel density and reactive hyperemia

2006 ◽  
Vol 12 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Markus Stucker ◽  
Christian Springer ◽  
Volker Paech ◽  
Nico Hermes ◽  
Matthias Hoffmann ◽  
...  
Keyword(s):  
Reactive Hyperemia ◽  
Skin Tumors ◽  
Vessel Density ◽  
Laser Doppler ◽  
Laser Doppler Flow ◽  
Doppler Flow

scholarly journals Pulpal blood flow recorded from exposed dentine with a laser Doppler flow meter using red or infrared light

2018 ◽  
Vol 87 ◽  
pp. 163-167 ◽  
Author(s):  
Kanittha Kijsamanmith ◽  
Noppakun Vongsavan ◽  
Bruce Matthews
Keyword(s):  
Blood Flow ◽  
Laser Doppler ◽  
Infrared Light ◽  
Flow Meter ◽  
Laser Doppler Flow ◽  
Doppler Flow ◽  
Pulpal Blood Flow

scholarly journals Noninvasive Measure of Microvascular Nitric Oxide Function in Humans Using Very Low-Frequency Cutaneous Laser Doppler Flow Spectra

2007 ◽  
Vol 14 (3) ◽  
pp. 169-180 ◽  
Author(s):  
Julian M. Stewart ◽  
Indu Taneja ◽  
Michael S. Goligorsky ◽  
Marvin S. Medow
Keyword(s):  
Nitric Oxide ◽  
Low Frequency ◽  
Laser Doppler ◽  
Laser Doppler Flow ◽  
Doppler Flow ◽  
Very Low Frequency

Functional Cerebral Hyperemia Is Unaffected by Isovolemic Hemodilution

2002 ◽  
Vol 96 (1) ◽  
pp. 142-147 ◽  
Author(s):  
Hui Shen ◽  
Andrew S. Greene ◽  
Elliot A. Stein ◽  
Anthony G. Hudetz
Keyword(s):  
Oxygen Tension ◽  
Laser Doppler ◽  
Tissue Oxygen Tension ◽  
Arterial Oxygen ◽  
Tissue Oxygen ◽  
Laser Doppler Flow ◽  
Isovolemic Hemodilution ◽  
Doppler Flow ◽  
Whisker Stimulation ◽  
Hyperemic Response

Background The cerebral hyperemic effect of hemodilution is well known; however, its mechanism and potential modifying effect on the functional hyperemic response to neuronal activation are unclear. The authors investigated the effects of isovolemic hemodilution on vibrissal stimulation-induced changes in cerebrocortical laser Doppler flow and tissue oxygen tension in the rat. Methods The hyperemic response to whisker stimulation was assessed in the whisker barrel cortex of 12 rats anesthetized with chloralose-urethane before and after hemodilution. Graded, isovolemic hemodilution was performed by three repeated withdrawals of 3 ml blood with replacement of equal volume of 5% serum albumin. Measured systemic hematocrit values were 39.3 +/- 1.3% (control), 29.5 +/- 1.0%, 22.3 +/- 1.5%, and 17.0 +/- 1.6% (after the three hemodilution steps). Arterial blood pressure was maintained at control levels with an infusion of methoxamine. Unilateral whisker stimulation was performed with a mechanical actuator at 8 Hz, and 10 cycles of 10 s on-30 s off periods. In six control animals, shed blood was immediately reinfused, resulting in no change in hematocrit, and whisker stimulation was performed using the same timeline as in the other animals. In six additional experiments, resting cerebral cortical oxygen tension was measured using the phosphorescence quenching technique following the same hemodilution protocol. Results Graded hemodilution increased baseline laser Doppler flow by 5.5 +/- 0.9%, 13 +/- 1.6%, and 23.7 +/- 2.2%. Vibrissal stimulation transiently increased laser Doppler flow by 17.0 +/- 2.0%. The hyperemic response was unchanged after hemodilution and was identical to that seen in the control group in all conditions. Tissue oxygen tension increased slightly but significantly with hemodilution at a rate of 1.4 mmHg per 10% hematocrit change (r = 0.83). Mean arterial pressure, arterial oxygen tension, carbon dioxide tension, and pH were within normal limits in each experimental group and were not different from control during hemodilution. Conclusions The results suggest that an increase in baseline flow during hemodilution maintains cortical oxygen supply and consequently preserves the normal functional hyperemic response.

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