A 23-Year-Old Woman Is Evaluated for Exercise Intolerance for the Past

A 23-year-old woman is evaluated for exercise intolerance for the past year. Blood pressure is 120/80 mm Hg and pulse is 88/min. On examination, a loud second heart sound was heard at the left second intercostal space. The patient was referred for evaluation with cardiac catheterization. A catheter with a balloon was inserted into the pulmonary circulation. It is advanced until it occludes a branch of the pulmonary system. The pressure is a measure beyond this point. What Does this pressure reading represent?

A) Left atrial pressure
B) Mean arterial pressure
C) Pulse pressure
D) Right atrial pressure
E) Right ventricular systolic pressure