The question on inspiration/expiration times is excellent. For years I thought, Respironics had really messed up in its Flex algorithm to have resulted in such an abnormal I:E ratio. Many members using Respironics machines display this clearly erroneous characteristic. The problem actually lies in OSCAR, and in Sleepyhead before. The program code that records I and E time was simply incorrect, and starts recording inspiration as the flow rate crosses zero. This is being corrected in the next version of OSCAR to allow expiration to continue until a positive flow greater than +2 mL/second is recorded. You can see on your charts, your flow returns rather abruptly to zero, and even looks positive well before inspiration begins. Your inspiration time should not begin until the sharply positive flow begins, and inspiration properly ends as flow crosses zero. The problem is that the program needs to be re-calibrated not to cut off expiration time prematurely. We theorize that the error is caused by Respironics machines having Flex return to CPAP pressure ahead of inspiration, rather than pressure following inspiration, as is the case with Resmed machines. Your respiration is normal, and the next version of OSCAR will either reflect the correct I:E times or will not report them at all for Respironics machines. This programming work was really only investigated and resolved in the past week or two.
Apnea Board Moderator
www.ApneaBoard.com
____________________________________________
Download OSCAR Software
Soft Cervical Collar
Optimizing Therapy
Organize your OSCAR Charts
Attaching Files
Mask Primer
How To Deal With Equipment Supplier
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.