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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Atrial tachycardia causes hydrops in fetal lambs.
American Journal of Physiology 1990 April
The purpose of this project was to study mechanisms responsible for edema formation in fetuses with hydrops. We produced hydrops fetalis in 28 fetal sheep [gestational age of 125 +/- 5 days (mean +/- SD)] by pacing their atria at 300-320 beats/min for 68 +/- 40 (SD) h. All fetuses developed peripheral edema and ascites [volume of ascitic fluid was 134 +/- 75 (SD) ml; total protein concentration was 3.10 +/- 0.6 (SD) g/dl, and total albumin concentration was 1.68 +/- 0.3 (SD) g/dl]. Pacing did not affect aortic pressure but increased venous pressure from 4 +/- 1 to 8 +/- 1 (SE) Torr. Pacing did not affect pH, arterial partial pressure of O2 (PaO2), or Na+ but increased PaCO2 from 53 +/- 1 to 55 +/- 1 (SE) Torr and K+ from 3.9 +/- 0.1 to 4.3 +/- 0.1 (SE) meq/l. Hematocrit increased from 29 +/- 1 to 32 +/- 1 (SE)% acutely with pacing but returned to base line by the last day of the experiment. Plasma protein concentration decreased slightly from 3.7 +/- 0.1 to 3.5 +/- 0.1 (SE) g/dl by the last day of the experiment; plasma albumin concentration did not change. Plasma volume decreased acutely from 271 +/- 19 to 238 +/- 16 (SE) ml and then remained decreased throughout the experiment. Red blood cell mass and the turnover time for albumin were not affected by pacing. We found no consistent relationship between edema formation and changes in arterial blood gas tensions, plasma protein concentrations, or the turnover time for albumin.2
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