## Immediate Management of TGA with Intact VSD **Key Point:** In transposition of the great arteries (TGA), the aorta arises from the right ventricle and the pulmonary artery from the left ventricle, resulting in two separate circulations incompatible with life unless there is mixing between systemic and pulmonary circulations. ### Why PGE₁ is Critical Prostaglandin E₁ (PGE₁) maintains ductal patency, allowing: - Right-to-left shunting through the ductus arteriosus - Mixing of deoxygenated systemic blood with oxygenated pulmonary blood - Improved systemic oxygen delivery **High-Yield:** PGE₁ is the **first-line emergency measure** in any cyanotic neonate with ductal-dependent systemic or pulmonary circulation (TGA, critical pulmonary stenosis, critical aortic stenosis, pulmonary atresia, tricuspid atresia). ### Balloon Atrial Septostomy (Rashkind Procedure) Performed urgently (within hours) to: 1. Create/enlarge an ASD or PFO 2. Increase right-to-left shunting at the atrial level 3. Improve systemic oxygenation as a bridge to definitive surgery **Clinical Pearl:** Even with PGE₁ alone, systemic oxygen saturation typically remains 60–75%. Balloon septostomy improves this to 80–85% by increasing atrial-level mixing. ### Timeline to Definitive Surgery ```mermaid flowchart TD A[TGA diagnosed in neonatal period]:::outcome --> B[Start PGE₁ immediately]:::action B --> C[Perform balloon atrial septostomy<br/>within hours]:::action C --> D[Stabilize on PGE₁ + septostomy]:::action D --> E[Arrange arterial switch operation<br/>within first week of life]:::action E --> F[Definitive repair]:::outcome ``` **Mnemonic:** **PGE₁ FIRST** — Prostaglandin E₁ Immediately Required for Survival in TGA. **Citation:** Park 26e Ch 8; Harrison 21e Ch 297 
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