First let's define some words.
is the vein which carries oxygen
throughout your body.
ventricle is a chamber in your heart which pumps blood from one chamber to the other and out of your heart.
Seems to me that this is a pulmonary artery
catheterization. I'm surprised they did not explain it to you. Anyway, the following are normal readings when this procedure is performed.
Normal pressures reflect a normally functioning heart with no fluid accumulation. These normal pressure readings are:
right atrium: 1-6 mm of mercury (mm Hg)
during contraction (systolic): 20-30 mm Hg
right ventricle at the end of relaxation (end diastolic): less than 5 mm Hg
pulmonary artery during contraction (systolic): 20-30 mm Hg
pulmonary artery during relaxation (diastolic): about 10 mm Hg
mean pulmonary artery: less than 20 mm Hg
pulmonary artery wedge pressure: 6-12 mm Hg
left atrium: about 10 mm Hg