Persistent Oxygen Requirement beyond Prematurity: A Case of Acquired Pulmonary Vein Stenosis

Figure 1

Transthoracic echocardiogram images demonstrating progressive pulmonary vein stenosis. (a) Color flow Doppler of pulmonary veins at initial diagnosis, with (b) measured mean pulmonary gradient (mean PG) of 5 mmHg and (c) increased mean pulmonary pressure gradient to 9 mmHg by 6 weeks after diagnosis.

(a)

(b)

(c)