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Echocardiographic images of the FO after birth. Postnatal echocardiographic images of the FO at 60 min (a, b), 2 h (c, d), 4 h (e, f), and 24 h (g, h) post-birth. Yellow arrow indicates the interatrial septum with adequate communication (left-to-right shunting through FO) between LA and RA depicted by laminar color Doppler (a–c, e, g) and pulsed wave Doppler (d, f, h). LA, left atrium; RA; right atrium; FO, patent foramen ovale; SVC, superior vena cava.
