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Right atrial pressure and venous return during cardiopulmonary bypass

Artikel i vetenskaplig tidskrift
Författare Per Werner Möller
B. Winkler
S. Hurni
P. P. Heinisch
A. Bloch
S. Sondergaard
S. M. Jakob
J. Takala
D. Berger
Publicerad i American Journal of Physiology - Heart and Circulatory Physiology
Volym 313
Nummer/häfte 2
Sidor H408-H420
ISSN 0363-6135
Publiceringsår 2017
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för anestesiologi och intensivvård
Sidor H408-H420
Språk en
Länkar doi.org/10.1152/ajpheart.00081.2017
Ämnesord Cardiac output, Extracorporeal membrane oxygenation, Mean systemic filling pressure, Right atrial pressure, Venous return, adaptation, animal, animal model, artificial ventilation, biological model, cardiopulmonary bypass, circulation, extracorporeal oxygenation, heart atrium function, heart atrium pressure, inferior cava vein, ligation, physiology, pig, pulmonary artery, superior cava vein, surgery, time factor, Adaptation, Physiological, Animals, Atrial Function, Right, Atrial Pressure, Blood Circulation, Models, Animal, Models, Cardiovascular, Respiration, Artificial, Sus scrofa, Time Factors, Vena Cava, Inferior, Vena Cava, Superior
Ämneskategorier Kardiologi

Sammanfattning

The relevance of right atrial pressure (RAP) as the backpressure for venous return (QVR) and mean systemic filling pressure as upstream pressure is controversial during dynamic changes of circulation. To examine the immediate response of QVR (sum of caval vein flows) to changes in RAP and pump function, we used a closed-chest, central cannulation, heart bypass porcine preparation (n ± 10) with venoarterial extracorporeal membrane oxygenation. Mean systemic filling pressure was determined by clamping extracorporeal membrane oxygenation tubing with open or closed arteriovenous shunt at euvolemia, volume expansion (9.75 ml/kg hydroxyethyl starch), and hypovolemia (bleeding 19.5 ml/kg after volume expansion). The responses of RAP and QVR were studied using variable pump speed at constant airway pressure (PAW) and constant pump speed at variable PAW. Within each volume state, the immediate changes in QVR and RAP could be described with a single linear regression, regardless of whether RAP was altered by pump speed or PAW (r2 ± 0.586–0.984). RAP was inversely proportional to pump speed from zero to maximum flow (r2 ± 0.859– 0.999). Changing PAW caused immediate, transient, directionally opposite changes in RAP and QVR (RAP: P ≤ 0.002 and QVR: P ≤ 0.001), where the initial response was proportional to the change in QVR driving pressure. Changes in PAW generated volume shifts into and out of the right atrium, but their effect on upstream pressure was negligible. Our findings support the concept that RAP acts as backpressure to QVR and that Guyton’s model of circulatory equilibrium qualitatively predicts the dynamic response from changing RAP. NEW & NOTEWORTHY Venous return responds immediately to changes in right atrial pressure. Concomitant volume shifts within the systemic circulation due to an imbalance between cardiac output and venous return have negligible effects on mean systemic filling pressure. Guyton’s model of circulatory equilibrium can qualitatively predict the resulting changes in dynamic conditions with right atrial pressure as backpressure to venous return. © 2017 the American Physiological Society.

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