What saturation is expected after Glenn anastomosis?

SaO2 75-85% is expected after bidirectional Glenn due to mixing of oxygenated pulmonary venous blood with desaturated inferior caval blood. Saturations <70% warrant evaluation for pulmonary arteriovenous malformations.

What causes desaturation after Glenn?

Low saturation post-Glenn may indicate excessive pulmonary resistance, pulmonary AVMs (common without hepatic flow), systemic-pulmonary collaterals, or obstruction at the anastomosis.

When is Fontan completion performed after Glenn?

Fontan completion is typically performed 12-24 months after Glenn, usually at 2-4 years of age, when pulmonary vascular resistance has fallen sufficiently to support passive pulmonary blood flow.

Glenn Anastomosis Saturation Target

Define acceptable oxygen saturation targets after bidirectional Glenn anastomosis (superior cavopulmonary connection). Expected SaO2 75-85% reflects bidirectional mixing physiology.

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