Hypoxemia without persistent right-to-left pressure gradient across a patent foramen ovale: A clinical challenge

Table 1 Pressure and oxygen saturation in various chambers measure on cardiac catheterization

Location	Pressure (mmHg)	Oxygen saturation
Right atrium	2
High		65%
Medium		63%
Low		67%
Right ventricle	2/18	60%
Pulmonary artery	20/6	61%
Left atrium	3	95%
Aorta		95%
Inferior venacava		73%
Superior venacava		70%