After a routine ultrasound at 24 weeks, Brailey and Louis Valenzuela learned some unexpected news about their baby, Arley — ...

The left heart pressures increase as the low resistance placenta is replaced by the high-resistance systemic circulation. The PaO 2 rises dramatically, from fetal levels of 30 to 40 mm Hg to ...

After a routine ultrasound at 24 weeks, Brailey and Louis Valenzuela learned some unexpected news about their baby, Arley — she had an olive-sized tumor on her heart known as pericardial ...