Has anyone ever heard of having a step up in oxygen in the right side of the heart without a defect to explain it? I had a right heart cath to rule out pulmonary hypertension (3 echos said I had it in mild to moderate form and I am having shortness of breath as well as at home drops in oxygen during simple tasks like walking – o2 recovers quickly but has dropped as low as 61٪). Pulmonary hypertension was ruled out by the right heart cath. However there was a significant step up in oxygen in the right side of my heart indicating a possible shunt (hole in the heart). The right side of the heart is supposed to be oxygen poor as blood is headed back to the lungs to pick up another load of oxygen. In my case a hole in the heart or other defect was ruled out though bubble echo and heart MRI. Doc said cirrhosis of liver could cause this problem but because I don’t have cirrhosis that I don’t have a reason to be short of breath. (I do have non-alchoholic fatty liver.) Despite this info, I continue to have shortness of breath/fast, shallow breathing that lasts hours and I continue to have o2 drops and lightheadedness with activities of daily living (just walking into the kitchen for example.) I’ve videoed my pulse oximeter to prove this is happening, but so far it hasn’t been an issue in a doctor’s office. During the last in-office 6 minute walk test it took 2 minutes for my heartrate to raise above 70 then 92 was the lowest my saturation dropped. (Of course the hall I walked was short and cluttered with equipment, but at the very list my heartrate should have seen some kind of movement immediately, I am obese and not athletic.) I don’t think the nurse reported the heart rate issue to the pulmonologist and my cardiologists keeps telling me there is nothing wrong with my heart. Last week I was in the ER short of breath – nothing – but while there my BP dropped to 103/34. All this data indicates there is a problem, but docs are saying I am fine and nothing is wrong. I can’t influence right heart cath readings, and I don’t feel that I am doing anything to influence other readings. Has anyone ever heard of something similar to this?