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Intercompartmental fluid volume shifts during cardiopulmonary bypass measured by A-mode ultrasonography

Department of Anaesthesia, Medical University Luebeck, Luebeck, Germany, dr.schumacher.j{at}t-online.de

Wolfgang Eichler

Department of Anaesthesia, Medical University Luebeck, Luebeck, Germany

Matthias Heringlake

Department of Anaesthesia, Medical University Luebeck, Luebeck, Germany

Hans-Hinrich Sievers

Department of Cardiac Surgery, Medical University Luebeck, Luebeck, Germany

Karl-Friedrich Klotz

Department of Anaesthesia, Medical University Luebeck, Luebeck, Germany

To investigate the time course of fluid extravasation during cardiopulmonary bypass (CPB), we measured the peripheral tissue thickness (TT) by A-mode ultra-sound in 34 patients undergoing elective cardiac surgery. TT of the forehead was determined by a handheld A-mode ultrasound device and 10 MHz Transducer at nine defined intervals, from the night before surgery until the first postoperative day.

Mean calculated loss of 1700±40 mL (SEM) water during the fasting period resulted in a significant reduction of TT by 0.28±0.03 mm. From induction to start of CPB, rehydration with 1000 mL of fluid was performed and TT increased to baseline. After 60 min of extracorporal circulation, forehead TT increased significantly by 0.75±0.08 mm and remained unchanged until the end of surgery when the measured fluid gain was 1580±138 mL. At discharge from ICU, negative fluid regimen resulted in a balance of -127±146 mL whereas TT declined significantly to + 0.16±0.09 mm compared to baseline.

Dehydration due to fasting and the marked interstitial fluid extravasation during CPB could be detected by the changes of the peripheral TT. We conclude that parts of the fluid load during CPB are shifted from the intravascular compartment to the interstitial space in a time-dependent manner.

Perfusion, Vol. 19, No. 5, 277-281 (2004)
DOI: 10.1191/0267659104pf753oa


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