I was in the hospital about every 1 week because I had heart problems. Every time I was in the hospital they put me on medical ventilator, so it would help me breath and whenever I was on it I just felt so good! When I told the doctors, they asked me and my husband if we wanted a portable one! I told them yes, it cost us 20,000 dollars! So when I was pergnant I used that machine all the time! I still do now (mostly when I can not breath or when I am sleeping)!