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The Journal of Thoracic and Cardiovascular Surgery, Vol 79, 181-187, Copyright © 1980 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association
FJ Menninger 3d, ER Rosenkranz, JR Utley, WP Dembitsky, AR Hargens and RM Peters
Using the Scholander-Hargens wick technique to measure interstitial fluid
hydrostatic pressure (IFP) in thigh muscle (MIP) and subcutaneous tissue
(SQIP), we have studied 12 patients undergoing cardiopulmonary bypass
(CPB). Simultaneous measurements were made of serum total proteins (TP) and
colloid osmotic pressure (COP). Bypass was carried out with a nonblood,
noncolloid prime. In the postoperative period, colloid and blood were given
which raised COP above prebypass levels (see Table II). MIP rises more with
hemodilution than does SQIP and is less negative throughout. MIP rises
faster when COP drops than does SQIP. These findings suggest that
subcutaneous tissue interstitial space is loose and has a high compliance,
whereas muscular tissue interstitial space is tight and has a low
compliance. The increased pressure represents increase in fluid which is
then removed promptly as COP is restored in the postoperative period.
Experimental studies in animals show a response similar to MIP in the
myocardium.
ARTICLES
Interstitial hydrostatic pressures in patients undergoing CABG and valve replacement
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