Transannular Patch: A Surgical Solution for TOF and RVOT Obstruction

View profile for Kabilan K L

Towards Building Health | Pediatric Cardiac Nurse | 200+ Medical Content |

258/365 🔹 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗮 𝗧𝗿𝗮𝗻𝘀𝗮𝗻𝗻𝘂𝗹𝗮𝗿 𝗣𝗮𝘁𝗰𝗵 ? ✔️A transannular patch (TAP) is a surgical technique used to enlarge the right ventricular outflow tract (RVOT) and pulmonary valve annulus. ✔️It is commonly performed in children with Tetralogy of Fallot (TOF) or other congenital heart defects where the pulmonary valve annulus is too small and obstructs blood flow from the right ventricle to the pulmonary artery. 🔹 Why is it Needed? In TOF and related conditions: 🔺There is pulmonary stenosis (PS) due to a narrow pulmonary annulus, valve, and infundibulum. 🔺Even after muscle resection, the annulus may still be too small. 🔺To relieve RVOT obstruction and allow adequate blood flow to the lungs, surgeons enlarge the narrowed annulus with a patch. 🔹 Surgical Steps (Simplified) 1. Right ventriculotomy / RVOT incision 🟥A vertical incision is made through the RVOT across the pulmonary annulus, extending into the main pulmonary artery. 2. Resection of obstructing muscle bundles 🟥Infundibular muscle is removed to relieve obstruction below the valve. 3. Pulmonary valve assessment 🟥If valve leaflets are dysplastic or small, they may be incised (valvotomy) or partly excised. 4. Patch placement 🟥A patch (usually autologous pericardium or synthetic material) is sewn across the RVOT incision, extending across the annulus → “transannular”. 🟥This enlarges both the annulus and RVOT, relieving stenosis. 🔹 Hemodynamic Consequences ✅ Advantages ⚡Relieves RVOT obstruction completely. ⚡Allows unobstructed blood flow into pulmonary arteries. ⚠️ Disadvantage (main drawback) 🧪The pulmonary valve annulus is cut open and patched, so pulmonary valve function is lost → leads to pulmonary regurgitation (PR). 🧪Chronic PR can cause right ventricular dilation and dysfunction later in life. 🔹 Long-Term Considerations ❗Children with TAP usually do well in childhood. ❗But as they grow, severe pulmonary regurgitation may cause symptoms (arrhythmia, RV failure, exercise intolerance). ❗Many will need pulmonary valve replacement (PVR) in adolescence or adulthood. 🔹 Visual Concept (Imagine) 🧩Think of the pulmonary annulus like a tight ring. 🧩A transannular patch is like cutting open the ring and stitching in a piece of cloth to make it larger. 🧩Blood can now pass easily, but the “ring” no longer closes properly → regurgitation happens. ✅ In summary: A Transannular Patch (TAP) is a surgical enlargement of the RVOT and pulmonary annulus (usually in TOF repair), using a patch that extends across the valve annulus. It completely relieves obstruction but sacrifices the pulmonary valve, leading to free pulmonary regurgitation and a high likelihood of needing valve replacement later in life. Stay Consistent !!

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FATHIMA SHERIN K P

Non-Invasive Cardiovascular Technologist

1mo

Informative

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