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Resumo O cateter de artéria pulmonar é um monitor invasivo geralmente usado durante cirurgias cardíacas em pacientes de alto risco para aprimorar as funções cardíacas. Apresentamos o caso de escoamento de sangue pela porta de conexão do cateter de artéria pulmonar para oximetria que resultou na impossibilidade de monitorar o débito cardíaco contínuo e na substituição do cateter. A causa do sangramento anormal foi posteriormente confirmada como um defeito de fabricação. Pulmonary artery catheter is an invasive monitor usually placed in high‐risk cardiac surgical patients to optimize the cardiac functions. We present this case of blood oozing from the oximetry connection port of the pulmonary artery catheter that resulted in the inability to monitor continuous cardiac output requiring replacement of the catheter. The cause of this abnormal bleeding was later confirmed to be due to a manufacturing defect. [ABSTRACT FROM AUTHOR]