Pulmonary Artery Normal/Abnormal Pressure

I keep seeing in various places that normal pulmonary artery pressure is around 20, so can anybody shed light on the reason that none of the cardiologists or the pulmonologist I have seen are not very concerned and/or have even mentioned! that my pressure on my last two echos was 46 and 41? Plan to discuss this with the cardiologist at next appointment but it's not until Nov 20. One of the findings on the echos is "mild pulmonary artery hypertension" yet I have had to pursue doctor appointments myself regarding this to try to find out more. Needless to say I worry about this every day!