<div class="FTQUOTE"><begin quote><em>Originally posted by: <strong>enjoylifesunshine</strong></em> <span style="font-family: Verdana; color: black; font-size: 9pt;">My husband is 27, dx at 6 months and hisis opposite too. His FEV1 is in the mid 20s and his O2 sats are between 89-92. He refuses to wear oxygen. I am just curious which has a worse effect, low O2 stats or lowered lung function? I think it is odd how they don't really correspond. </end quote> Wow you opened this thread 3 years later! hehe. But good timing. I am about to do a sleep study to find out if I need night oxygen. My FEV1 is 35% (for many years) and my doctor tells me my heart is still perfectly fine. However, if people who need night oxygen don't go on it, their heart will suffer. My doctor went as far as to say that in the long run, if I don't use night O2 (if the test results indicate that I need it), it'll be my heart that will suffer the MOST. Not sure if I really believe this or if he was just scaring me into going on O2 (I'm having a hard time accepting it)...