bidirectional Glenn
A staged palliative surgery connecting the superior vena cava directly to the pulmonary arteries, typically performed in single ventricle patients.
Full Definition
A bidirectional Glenn shunt is an intermediate surgical procedure in the staged palliation of single ventricle heart defects. The operation connects the superior vena cava directly to the right pulmonary artery, allowing blood from the upper body to flow passively to the lungs. This reduces the volume load on the single ventricle while maintaining adequate pulmonary blood flow. It is typically performed between 4-6 months of age as the second stage, following an initial Norwood or similar procedure, and preceding the Fontan completion. The procedure improves oxygen saturation compared to first-stage palliation while preparing the patient for eventual Fontan circulation.
Usage
Usage note: Distinguished from 'classic Glenn' which connected SVC to right pulmonary artery with disconnection of RPA from main PA.
In Context
- "The patient underwent bidirectional Glenn at age 5 months with excellent postoperative recovery." — Surgical case report
- "Cardiac catheterization prior to bidirectional Glenn demonstrated suitable pulmonary artery pressures and anatomy." — Pre-operative assessment