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Intrarenal oxygen tension measured by a modified Clark electrode at normal and low blood pressure and after injection of x-ray contrast media

Content Provider	Springer Nature Link
Author	Liss, P. Nygren, Anders Revsbech, Niels P. Ulfendahl, H. R.
Copyright Year	1997
Abstract	The oxygen tension (pO2) in the rat kidney was studied using a Clark microelectrode with a guard cathode behind the sensing cathode. The mean (± SEM) outer tip diameter of the electrodes used was 5.5 ± 1.9 μm. The zero-pO2 current amounted to 12.5 ± 0.9 pA at 37°C; at air saturation it was 252 ± 22.9 pA. Rats with a systolic blood pressure (BP) above 80 mmHg (where 1 mmHg = 133 Pa) showed an average pO2 in the cortex of 45 ± 2 mmHg and in the outer medulla of 31 ±1 mmHg. In rats with a BP below 80 mmHg a paradoxically high outer medullary pO2 of 40 ± 4 mmHg was found, while the pO2 in the cortex was 27 ± 4 mmHg. Changes in pO2 were also noted in the renal cortex and outer medulla after intravenous injections of the x-ray contrast medium diatrizoate (370 mg iodine/ml). In rats with normal BP, injection of diatrizoate caused a slight fall in pO2 in the renal cortex, from 42 ± 4 to 38 ±4 mmHg. In the medulla pO2 decreased significantly from 34 ± 6 to 20 ±4 mmHg. Ringer’s solution did not induce any changes.
Starting Page	705
Ending Page	711
Page Count	7
File Format	PDF
ISSN	00316768
Journal	Pflügers Archiv
Volume Number	434
Issue Number	6
e-ISSN	14322013
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-09-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Clinical Biochemistry

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