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Closed heart surgery for congenital heart disease in infancy
P J del Nido1, W G Williams, J G Coles
1Division of Cardiothoracic Surgery, University of Illinois, Chicago.
Insights
Palliative heart surgery in children with congenital heart disease improves physiology, not anatomy. Procedures like the Blalock-Taussig shunt, pulmonary artery banding, and atrial septectomy are used based on specific clinical needs and changing indications.
Area of Science:
- Pediatric Cardiology
- Congenital Heart Disease Surgery
- Palliative Cardiac Interventions
Background:
- Congenital heart disease (CHD) necessitates surgical intervention, which can be palliative or corrective.
- Palliative cardiac surgery aims to improve physiological deficits rather than correct anatomical defects in CHD.
- Indications for palliative versus corrective surgery have evolved, with palliation now reserved for specific complex cases.
Purpose of the Study:
- To review the role and indications of palliative cardiac surgery in congenital heart disease.
- To describe common palliative procedures: Blalock-Taussig shunt, pulmonary artery banding, and atrial septectomy.
- To discuss the changing criteria for selecting palliative over corrective surgical approaches in pediatric CHD.
Main Methods:
- Review of palliative surgical techniques for CHD, including systemic to pulmonary artery shunts, pulmonary artery banding, and atrial septectomy.
- Discussion of indications, including cyanotic heart disease with decreased pulmonary blood flow, unrestricted pulmonary blood flow, and need for venous mixing.
- Analysis of factors influencing the choice between palliative and corrective surgery, such as pulmonary vascular resistance, growth potential, and age-related risk reduction.
Main Results:
- Blalock-Taussig shunts (using PTFE grafts) increase pulmonary blood flow; operative mortality is higher in neonates.
- Pulmonary artery banding decreases pulmonary blood flow for conditions like large left-to-right shunts or univentricular hearts, with risk influenced by defect complexity and infant's clinical state.
- Atrial septectomy improves venous mixing in specific cases, particularly in infants with univentricular hearts where other interventions failed.
Conclusions:
- Palliative cardiac surgery remains crucial for managing complex congenital heart disease in infants and children.
- The selection of palliative procedures is guided by specific physiological needs, anatomical limitations, and evolving surgical risk assessment.
- Techniques like Blalock-Taussig shunts, pulmonary artery banding, and atrial septectomy offer tailored physiological support when corrective surgery is not immediately feasible or optimal.
Abstract:
Closed heart surgery in congenital heart disease can be palliative or corrective. Palliative surgery aims at improving the physiologic deficit rather than the anatomic defect of the heart. Palliative procedures aim to increase pulmonary blood flow in cyanotic children with decreased pulmonary blood flow (Blalock-Taussig shunt), decrease pulmonary blood flow when there is unrestricted flow (pulmonary artery banding), or improve venous mixing in cyanotic children that require pulmonary and systemic venous mixing for survival (atrial septectomy). The indications for palliation over corrective surgery have changed over time. Now we reserve palliation for children that require low pulmonary vascular resistance for correction, a conduit that will require replacement as the child grows, or where the risk of the corrective procedure decreases rapidly with age. For palliation with systemic to pulmonary artery shunts, we prefer to perform a Blalock-Taussig subclavian to pulmonary artery shunt using a synthetic (PTFE) tube graft in infants. The operative mortality is higher in infants under 1 month of age but is not affected by weight or diagnosis. Palliative surgery to decrease pulmonary blood flow is restricted primarily to infants with large left-to-right shunts where the risk of correction in infancy is high (multiple VSDs) or not feasible (univentricular heart). The operative risk for pulmonary artery banding is affected mostly by the complexity of the cardiac defect and the clinical state of the infant (severe congestive failure) at the time of surgery. A trial septectomy to improve venous mixing is used mostly in infants with univentricular heart in whom a balloon septostomy was ineffective.(ABSTRACT TRUNCATED AT 250 WORDS)