Cardiac Output is a podcast on cardiothoracic anaesthesia and intensive care medicine.
Dr Mike Charlesworth and Dr Calum Downes bring you tacit knowledge from a national transplant and ECMO centre — the reasoning that never makes it into the textbook.
Cardiopulmonary bypass deliberately changes circulating volume, temperature, coagulation and myocardial activity; understanding haemodilution, hypothermia, heparin response, cardioplegia, separation from bypass and protamine reversal helps distinguish expected physiology from complications requiring intervention.
Intra-aortic balloon pump support depends on correctly timed diastolic inflation and pre-systolic deflation, with paired pressure traces, urine output and lactate helping identify effective unloading, migration, rupture and failed weaning rather than relying on machine settings alone.
Pre-operative intravenous iron modestly reduces transfusion and may add one day at home by 90 days after cardiac surgery, but the original 30-day outcome is neutral, major complications are unchanged and subgroup findings need cautious interpretation.
Protamine reversal after cardiopulmonary bypass can cause rate-related hypotension, allergic phenomena or catastrophic pulmonary hypertension with right ventricular failure, while excess protamine, heparin rebound and antithrombin-related heparin resistance require different recognition and treatment.
Post-cardiotomy bleeding demands immediate haemostatic resuscitation, assessment for tamponade and early surgical involvement without waiting for thromboelastography, while blood-product choice, platelet trends and the 4Ts score help distinguish coagulopathy from heparin-induced thrombocytopenia.
Cardiac surgery for infective endocarditis requires early team referral, timely optimisation and decisive perioperative troubleshooting. Key issues include molecular testing of operative valve tissue, antithrombin-related heparin resistance, vasoplegia and low cardiac output after bypass.
Modern infective endocarditis often presents as acute healthcare-associated sepsis without classical peripheral signs. Diagnosis depends on several adequately filled pre-antibiotic blood-culture sets, valve- and device-appropriate imaging, and careful distinction of vegetations from common mimics.
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