Effects of Hyperventilation and Hypoventilation on Cochlear Blood Flow and Endocochlear Direct-Current Potential

ORL ◽  
1995 ◽  
Vol 57 (4) ◽  
pp. 171-176 ◽  
Author(s):  
Hirofumi Yamamoto ◽  
Kazuo Makimoto ◽  
Michiro Kawakami ◽  
Yoshimitsu Ohinata ◽  
Hiroaki Takahashi
Keyword(s):  
Blood Flow ◽  
Direct Current ◽  
Cochlear Blood Flow ◽  
Current Potential

scholarly journals Lipopolysaccharide decreases cochlear blood flow dose dependently in a guinea pig animal model via TNF signaling

2021 ◽  
Author(s):  
Friedrich Ihler ◽  
Saskia Freytag ◽  
Benedikt Kloos ◽  
Jennifer Lee Spiegel ◽  
Frank Haubner ◽  
...  
Keyword(s):  
Animal Model ◽  
Blood Flow ◽  
Guinea Pig ◽  
Cochlear Blood Flow ◽  
Pig Animal Model

Effects of Electrical Stimulation of the Superior Cervical Ganglion on Cochlear Blood Flow in Guinea Pig

1993 ◽  
Vol 113 (2) ◽  
pp. 146-151 ◽  
Author(s):  
Tian-Ying Ren ◽  
E. Laurikainen ◽  
W. S. Quirk ◽  
J. M. Miller ◽  
A. L. Nuttall
Keyword(s):  
Blood Flow ◽  
Electrical Stimulation ◽  
Guinea Pig ◽  
Superior Cervical Ganglion ◽  
Cochlear Blood Flow ◽  
Cervical Ganglion ◽  
Stimulation Of

The effect of topically administered latanoprost on the cochlear blood flow and hearing

2013 ◽  
Vol 77 (6) ◽  
pp. 981-985 ◽  
Author(s):  
Chul Ho Jang ◽  
Yong Beom Cho ◽  
Cheol Hee Choi ◽  
Jae-Young Um ◽  
Pa-Chun Wang ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cochlear Blood Flow

Cochlear blood flow in relation to age in normotensive and spontaneously hypertensive rats

1987 ◽  
Vol 104 (3-4) ◽  
pp. 243-250 ◽  
Author(s):  
Maria Hillerdal ◽  
Erik Borg ◽  
Berit Engstrom ◽  
Elisabeth Hultcrantz
Keyword(s):  
Blood Flow ◽  
Spontaneously Hypertensive Rats ◽  
Hypertensive Rats ◽  
Cochlear Blood Flow ◽  
Spontaneously Hypertensive

Eicosanoids in Rat Brain during Ischemia and Reperfusion—Correlation to DC Depolarization

1990 ◽  
Vol 10 (3) ◽  
pp. 358-364 ◽  
Author(s):  
F. Tegtmeier ◽  
C. Weber ◽  
U. Heister ◽  
I. Haker ◽  
D. Scheller ◽  
...  
Keyword(s):  
Arachidonic Acid ◽  
Rat Brain ◽  
Direct Current ◽  
Eicosatetraenoic Acid ◽  
Ischemia And Reperfusion ◽  
Ischemic Time ◽  
Isolated Perfused Rat Brain ◽  
Current Potential

The effects of complete ischemia on cerebral arachidonic acid (AA) metabolism were investigated in the isolated perfused rat brain. During 12.5 min of ischemia, AA, 5-hydroxy-6,8,11,14-eicosatetraenoic acid, and 15-hydroxy-5,8,11,13-eicosatetraenoic acid increased 129-, 4-, and 10-fold, respectively, while subsequent reperfusion for 30 min resulted in normalized levels independently of the duration of preceding ischemia. Prostaglandin (PG) F2α, PGE2, PGD2, 6-keto-PGF1α, and thromboxane (Tx) B2 remained at preischemic levels during 12.5 min of complete ischemia. However, at the end of subsequent reperfusion for 30 min, the levels of the prostanoids PGF2α, PGE2, PGD2, 6-keto-PGF1α, and TxB2 increased according to the preceding ischemic time. The levels reached a maximum after 7.5 min of ischemia and were elevated by 7-, 14-, 48-, 3-, and 30-fold, respectively. A prolongation of ischemia of up to 12.5 min was not associated with further increases of prostanoids at the end of reperfusion. The mechanisms underlying the metabolism of eicosanoids are discussed in relation to the changes of cortical direct current potential.

A Vasoactive Agent Enhances the Effect of ATP on Cochlear Blood Flow

2001 ◽  
Vol 121 (2) ◽  
pp. 130-134 ◽  
Author(s):  
Hideki Takago, Kazunori Yokoyama, K
Keyword(s):  
Blood Flow ◽  
Cochlear Blood Flow ◽  
Vasoactive Agent

Observations of cochlear blood flow dynamics using the laser Doppler flowmeter

1989 ◽  
Vol 246 (3) ◽  
pp. 147-150 ◽  
Author(s):  
M. Kawakami ◽  
K. Makimoto ◽  
T. Nakajima ◽  
H. Takahashi
Keyword(s):  
Blood Flow ◽  
Flow Dynamics ◽  
Laser Doppler ◽  
Laser Doppler Flowmeter ◽  
Cochlear Blood Flow ◽  
Blood Flow Dynamics ◽  
Doppler Flowmeter

Microsphere Determination of Cochlear Blood Flow in Chickens

1987 ◽  
Vol 96 (4) ◽  
pp. 341-348 ◽  
Author(s):  
Daniel Zaluzec ◽  
Joseph Ramzy ◽  
Robert Wotring ◽  
Lincoln Gray
Keyword(s):  
Blood Flow ◽  
Inverse Relationship ◽  
External Auditory Meatus ◽  
Blood Gas ◽  
Radioactive Microspheres ◽  
Cochlear Blood Flow ◽  
Camera Lucida ◽  
Micron Diameter ◽  
The Brain

Chickens were injected with 9-micron-diameter radioactive microspheres. Cochleas were removed through the external auditory meatus, and the positions of all embedded microspheres were drawn under camera-lucida. Constant measurements of arterial pressures and postinjection blood-gas determinations confirmed that injections were made into normal circulatory systems. The averaged estimate of cochlear blood flow in chickens is 0.75 μl/min. Variability in these data from chickens is similar to that reported from mammals. A potentially important but puzzling observation is an inverse relationship between blood flow to the cochlea and to the brain. The ease of cochlear extraction makes chickens ideal models for study of cochlear blood flow.

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