CardioNerds (Drs. Rawan Amir, Tripti Gupta, and Alysha Joseph) discuss the fundamentals of adult congenital heart disease (ACHD) surgery with Dr. Elizabeth Stephens. Audio editing by CardioNerds academy intern, Grace Qiu. Using a case of a young adult undergoing a Ross procedure, the episode walks through what happens in the operating room—from induction and intraoperative transesophageal echocardiography (TEE) to cardiopulmonary bypass (CPB), myocardial protection, and surgical repair. The discussion highlights key concepts including cardioplegia, cross-clamp and bypass times, hypothermic circulatory arrest, and the complexity of redo sternotomy. This episode provides learners with a practical framework to interpret operative reports, anticipate postoperative physiology, and better collaborate with surgical teams. This episode was produced by the CardioNerds ACHD Council and planned by Dr. Rawan Amir. CardioNerds Adult Congenital Heart Disease PageCardioNerds Episode Page Pearls “LV distension kills patients.”Preventing left ventricular distension with appropriate venting and awareness of aortic insufficiency is critical to intraoperative safety. TEE can change the surgical plan in real time.Findings such as underestimated aortic regurgitation, mitral pathology, or a PFO may directly alter cannulation and cardioplegia strategy. Cross-clamp time = myocardial ischemic time; bypass time = systemic stress.Both are key predictors of postoperative complications including renal injury, bleeding, and ventricular dysfunction. Redo sternotomy risk is driven by anatomy, not just number.Aorta adherent to the sternum, conduit position, and chamber pressurization define risk more than the number of prior surgeries. Think longitudinally—ACHD surgery is lifetime planning.Surgical materials and strategies must account for future interventions, especially in younger patients. Notes: Notes drafted by Dr. Alysha Joseph, aided by generative artificial intelligence. What are the key steps in congenital cardiac surgery from incision to closure? Preoperative planning is multidisciplinary, involving surgeon, anesthesia, cardiology, and ICU teams; high-risk inductions (e.g., critical AS, Williams syndrome) are identified early TEE is performed immediately after induction to reassess anatomy and may reveal new findings (e.g., underestimated AI, mitral disease, PFO) Median sternotomy is performed, followed by creation of a pericardial well to optimize exposure Heparin is administered prior to cannulation; arterial and venous cannulas are placed for initiation of CPB Cross-clamp is applied and cardioplegia delivered to arrest the heart, allowing a still and protected operative field Surgical repair (e.g., Ross procedure) is performed, followed by de-airing, cross-clamp removal, and reperfusion Patient is weaned from bypass with TEE reassessment, hemostasis achieved, and chest closed What is cardioplegia and how is it delivered? Cardioplegia is a potassium-rich solution that arrests myocardial activity and reduces metabolic demand Most commonly used solution in the U.S. is Del Nido cardioplegia, originally developed for pediatric myocardium Delivery strategies include: Antegrade (via aortic root) – standard approach Ostial (direct coronary delivery) – used when aortic root cannot be relied upon Retrograde (via coronary sinus) – useful in severe AI or coronary disease NOTE: Severe aortic regurgitation can impair antegrade delivery and requires alternative strategies and LV venting What do cross-clamp time and bypass time represent clinically? Cross-clamp time = duration of myocardial ischemia while the heart is arrested Bypass time = total duration on CPB, reflecting systemic exposure to non-physiologic circulation Prolonged cross-clamp time (>2–3 hours) increases risk of myocardial dysfunction, especially with poor baseline function Longer bypass time is associated with increased risk of renal injury, coagulopathy, and bleeding These metrics often reflect both case complexity and intraoperative challenges What is hypothermic circulatory arrest (HCA) and when is it used? HCA involves complete cessation of blood flow to allow a bloodless surgical field Typically used in complex aortic arch repairs Patients are cooled to ~18°C to reduce metabolic demand and protect organs Duration is ideally limited to <30 minutes to minimize neurologic injury Adjuncts include: Antegrade cerebral perfusion (ACP) – provides targeted brain perfusion Retrograde cerebral perfusion (RCP) – less effective for oxygen delivery What makes redo congenital cardiac surgery high risk? Re-entry risk depends on anatomical relationships: Aorta adherent to sternum (especially midline) poses high risk of catastrophic bleeding RVOT conduits or pressurized chambers near sternum increase injury risk Loss of peripheral vascular access from prior procedures limits bailout options Accumulated comorbidities (renal, hepatic dysfunction) increase perioperative risk Diastolic dysfunction and ventricular impairment complicate weaning from bypass Complexity of planned repair and institutional/surgeon experience significantly influence outcomes What does “venting the ventricle” mean and why is it important? Venting refers to decompression of the left ventricle using a cannula (often via right superior pulmonary vein) Prevents LV distension, which can impair myocardial protection and lead to hemodynamic collapse Particularly important in the presence of aortic insufficiency or inadequate forward flow Failure to adequately vent can result in arrhythmias, poor recovery, and adverse outcomes What materials are used in congenital surgery and how do they impact long-term care? Common patch materials include bovine pericardium (durable, non-stretch), Dacron, Gore-Tex, and autologous pericardium Conduits (e.g., homografts, Contegra, Hancock) are used to connect cardiac structures and often contain valves Most materials do not grow with the patient and are prone to calcification over time Surgical decisions must consider future transcatheter or surgical interventions Limited availability of certain graft sizes (e.g., pulmonary homografts) impacts real-world decision-making References: 1. Salis, S. et al. Cardiopulmonary bypass duration is an independent predictor of morbidity and mortality after cardiac surgery. J Cardiothorac Vasc Anesth. 2008;22(6):814-822. doi:10.1053/j.jvca.2008.08.004 2. Al-Sarraf, N. et al. Cross-clamp time is an independent predictor of mortality and morbidity in low- and high-risk cardiac patients. International journal of surgery (London, England). 2011; 9(1):104–109. https://doi.org/10.1016/j.ijsu.2010.10.007 3. Weiland, A. P. et al. Physiologic principles and clinical sequelae of cardiopulmonary bypass. Heart & lung : the journal of critical care. 1986;15(1):34–39. 4. Park, C. B. et al. Identifying patients at particular risk of injury during repeat sternotomy: analysis of 2555 cardiac reoperations. The Journal of thoracic and cardiovascular surgery. 2010;140(5):1028–1035. https://doi.org/10.1016/j.jtcvs.2010.07.086 5. Morales, D. L. et al. Repeat sternotomy in congenital heart surgery: no longer a risk factor. The Annals of thoracic surgery. 2008; 86(3):897–902. https://doi.org/10.1016/j.athoracsur.2008.04.044 6. Francica, A. et al. Cardioplegia between Evolution and Revolution: From Depolarized to Polarized Cardiac Arrest in Adult Cardiac Surgery. Journal of clinical medicine. 2021;10(19):4485. https://doi.org/10.3390/jcm10194485 7. Ghia, S. et al. Hypothermic Circulatory Arrest in Adult Aortic Arch Surgery: A Review of Hypothermic Circulatory Arrest and its Anesthetic Implications. Journal of cardiothoracic and vascular anesthesia. 2023; 37(12): 2634–2645. https://doi.org/10.1053/j.jvca.2023.08.139 8. Peivandi, A. D. et al. Grafts and Patches: Optimized but Not Optimal Materials for Congenital Heart Surgery. Pediatric cardiology. 2023;44(5):996–1002. https://doi.org/10.1007/s00246-023-03153-6

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