• Ferenc Peták, Ádám L Balogh, Péter Hankovszky, Gergely H Fodor, József Tolnai, Roberta Südy, Barbara N Kovács, Andrea Molnár, and Barna Babik.
• Department of Medical Physics and Informatics, University of Szeged, Szeged, Hungary. Electronic address: petak.ferenc@med.u-szeged.hu.
• J. Cardiothorac. Vasc. Anesth. 2022 Apr 1; 36 (4): 1047-1055.

ObjectiveTo investigate the effects of dopamine on the adverse pulmonary changes after cardiopulmonary bypass.DesignA prospective, nonrandomized clinical investigation.SettingA university hospital.ParticipantsOne hundred fifty-seven patients who underwent elective cardiac surgery that required cardiopulmonary bypass.InterventionsFifty-two patients were administered intravenous infusion of dopamine (3 µg/kg/min) for five minutes after weaning from cardiopulmonary bypass; no intervention was applied in the other 105 patients.Measurements And Main ResultsMeasurements were performed under general anesthesia and mechanical ventilation before cardiopulmonary bypass, after cardiopulmonary bypass, and after the intervention. In each protocol stage, forced oscillatory lung impedance was measured to assess airway and tissue mechanical changes. Mainstream capnography was performed to assess ventilation- and/or perfusion-matching by calculating the normalized phase-3 slopes of the time and volumetric capnograms and the physiologic deadspace. Arterial and central venous blood samples were analyzed to characterize lung oxygenation and intrapulmonary shunt. After cardiopulmonary bypass, dopamineinduced marked improvements in airway resistance and tissue damping, with relatively small decreases in lung tissue elastance. These changes were associated with decreases in the normalized phase-3 slopes of the time and volumetric capnograms. The inotrope had no effect on physiologic deadspace, intrapulmonary shunt, or lung oxygenation.ConclusionDopamine reversed the complex detrimental lung mechanical changes induced by cardiopulmonary bypass and alleviated ventilation heterogeneities without affecting the physiologic deadspace or intrapulmonary shunt. Therefore, dopamine has a potential benefit on the gas exchange abnormalities after weaning from cardiopulmonary bypass.Copyright © 2021 Elsevier Inc. All rights reserved.

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