Pulmonary hypertension (PH) can be classified into two types: precapillary PH and postcapillary PH. Precapillary PH is due to a primary elevation of pressure in the pulmonary artery system alone, such as in pulmonary arterial hypertension (PAH).Postcapillary PH is due to elevations of pressure in the pulmonary venous and pulmonary capillary systems, such as in pulmonary venous hypertension. This type of PH originates from problems in the left side of the heart.

I am uncertain why you were told not to research this condition. However, I was unfamiliar with this condition, so I did do a quick search. This is what I found.

This is from the AHA journals: Pulmonary hypertension (PH) may be postcapillary, a result of an increase in pulmonary venous pressure in left-sided heart diseases, or precapillary, caused by pulmonary vascular remodeling leading to increased pulmonary vascular resistance.

I also found this information: Precapillary hypertension is a condition where the blood pressure in the pulmonary arteries is too high before the oxygen-depleted blood reaches the capillaries in the lungs. It can be caused by pulmonary arterial hypertension, lung diseases such as chronic obstructive pulmonary disease (COPD), pulmonary fibrosis, and obstructive sleep apnea, or chronic thromboembolic pulmonary hypertension (CTEPH).

Postcapillary hypertension is a condition where the blood pressure in the pulmonary veins and pulmonary capillary systems is too high after blood has passed through the capillaries in the lungs. It is often caused by left-sided heart failure, which occurs when the left ventricle, the heart’s primary pumping chamber, has weakened due to high blood pressure or coronary artery disease.

I was originally classified as Group 1, pre-capillary and am now getting reclassified as Group 2., post capillary. I have a new RHC scheduled for 08/01 to get a new wedge number and other readings. I was taken off my Group 1 meds: Opsumit and Adempas as they are dangerous for Group 2 people though I felt good on them and my numbers were better on them than they are now

I was told that pre capillary involved the artery carrying oxygenated blood from the lung to the heart and post capillary involve pre-oxygenated blood. From the heart to the lung.

Thank you for your search. I still wonder whether any meds should be added. Reading your findings, I have a feeling it makes my PH diagnosis worse. Have an appointment tis month with my PH doc at Temple Univ. Hospital in Philadelphia. Will ask more questions. Again, thank you!!