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The Journal of Thoracic and Cardiovascular Surgery, Vol 104, 659-665, Copyright © 1992 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Limiting edema in neonatal cardiopulmonary bypass with narrow-range molecular weight hydroxyethyl starch

T Yeh Jr, JM Parmar, IM Rebeyka, GK Lofland, EL Allen, RJ Dignan, CM Dyke and AS Wechsler
Medical College of Virginia/Virginia Commonwealth University, Richmond 23298.

The marked edema observed in neonatal cardiopulmonary bypass is thought to result from pathologic increases in capillary permeability. Pentafraction is a subfraction of hydroxyethyl starch that is thought to be of appropriate size and shape to be retained by leaking capillaries and seal endothelial gaps in capillary basement membranes. To test the hypothesis that pentafraction would reduce edema in neonatal cardiopulmonary bypass, we established a model of edema formation in neonatal bypass in which neonatal piglets underwent 2 hours of normothermic cardiopulmonary bypass with crystalloid prime and no myocardial ischemia. Before initiation of bypass, experimental animals (n = 11) received intravenous pentafraction, 3 gm/kg. Control animals (n = 10) received an equivalent volume of saline. Hemodynamic parameters, animal weight, fluid redistribution, and percent tissue water of individual organs were assessed during and after bypass. Pentafraction treatment resulted in significant differences in (1) lowered percent body weight gain from baseline (11% versus 48%), (2) lowered volume requirement to maintain venous reservoir during cardiopulmonary bypass (148 ml/kg versus 581 ml/kg), (3) less fluid loss from the peritoneum (11 ml/kg versus 115 ml/kg), and (4) lowered percent tissue water of kidney, pancreas, stomach, jejunum, colon, and skeletal muscle (p less than 0.05 by unpaired t test). Pentafraction had no effect on hemodynamic parameters during bypass nor in percent tissue water of heart, lung, liver, spleen, skin, or brain. In summary, pentafraction lessened weight gain and fluid requirements during cardiopulmonary bypass, favorably influencing the percent tissue water of certain organs. If pentafraction functions as proposed, it may have wide applicability not only in cardiopulmonary bypass (or extracorporeal membrane oxygenation) but also in other clinical scenarios with altered capillary permeability.


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