Glenn Procedure

Glenn Procedure (Cardiology)

In 2026, the Glenn Procedure is the critical second stage in the surgical reconstruction of a single-ventricle heart. Usually performed when an infant is between 4 and 6 months old, it prepares the body for the final Fontan procedure by reducing the workload on the heart's lone functioning ventricle.

When You Should Consider the Glenn Procedure

• Diagnosis of a single-ventricle heart defect (e.g., HLHS or Tricuspid Atresia)

• Successful completion of the Stage 1 (Norwood) procedure

• Infant age typically between 4 and 6 months

• Signs that the infant is "outgrowing" the initial shunt (decreasing oxygen levels)

• Sufficient growth and development of the pulmonary arteries

Key Goals of the Glenn Procedure

• Connecting the superior vena cava (SVC) directly to the pulmonary artery

• Allowing blood from the upper body to flow passively into the lungs

• "Unloading" the single ventricle so it only pumps blood to the body, not the lungs

• Increasing systemic oxygen levels and reducing cyanosis (blueness)

• Providing a stable "bridge" to the final Fontan stage of reconstruction

How the Procedure Is Performed

• Connection: The superior vena cava is detached from the heart and sewn to the pulmonary artery.

• Shunt Removal: Any temporary shunts from the previous surgery are typically removed.

• Lung Access: Blood from the head and arms is redirected to bypass the heart's right side.

• Monitoring: Surgeons use real-time NIRS technology to ensure brain oxygenation.

• Incision: Many 2026 cases use a partial sternotomy for faster healing and less pain.

2026 Innovations in Glenn Care

• Minimally Invasive Sternotomy: Smaller incisions lead to faster bone healing in infants.

• Hemodynamic Simulation: AI-driven software predicts blood flow patterns for better precision.

• Real-Time NIRS: Standard monitoring ensures the brain receives optimal oxygen throughout.

• 3D Echo Guidance: Enhanced imaging helps surgeons visualize the connection in real-time.

• Specialized Post-Op Protocols: Focused care to manage the body's adjustment to new pressures.

Recovery and Expectations

• Hospital Stay: Most infants stay in the Cardiac ICU for 5 to 7 days.

• Pressure Adjustment: Temporary facial puffiness is common as the body adapts to new flow.

• Pain Management: Modern protocols focus on infant comfort and faster extubation.

• Growth Monitoring: Weight gain and oxygen levels are closely tracked post-surgery.

• Next Steps: This is a bridge to the Fontan Procedure, usually performed at age 2 to 4.

Benefits of the Glenn Procedure

• Significantly reduces the strain and workload on the heart’s single ventricle

• Improves skin color and energy levels by increasing blood oxygenation

• Provides several years of circulatory stability for the growing child

• Minimally invasive techniques in 2026 result in smaller scars and quicker recovery

• Prepares the pulmonary arteries for the final stage of heart reconstruction