Are RDI's important when AHI is low?
Question:
On my recent sleep study, my RDI was 18 per hour. I had only one Apnea. Do RDI’s cause arrousals that disrupt sleep? I never got beyond sleep stage 2 and have no REM sleep. The test collected only an hour of data because I could not sleep. ~snoozy~
Response:
Yes they do, RDI means ‘respiratory disturbance index’. Did they list how many hypopneas you had? "Snoozy" <sno…@nowhere.net> wrote in message
news:40DA0EA6.E9205716@nowhere.net… – Hide quoted text — Show quoted text -> On my recent sleep study, my RDI was 18 per hour. I had only one > Apnea. Do RDI’s cause arrousals that disrupt sleep? I never got beyond > sleep stage 2 and have no REM sleep. The test collected only an hour of > data because I could not sleep. > ~snoozy~
Response:
Snoozy, Please clarify your question. As best I understand it, RDI = AHI. RDI and AHI are both equal to: (total number of apneas + total number of hypopneas) / hours. The most common definition of ‘apnea’ is a cessation of respiratory airflow for 10 or more seconds. The most common definition of ‘hypopnea’ is a 50% or more reduction in respiratory airflow for 10 or more seconds. Hypopneas are a ’superset’ of apneas, and apneas are a ’subset’ of apneas by that definition. The way the two most widely sold auto-titrating machines report is: Apnea index = Apneas / hours Hypopnea index = ‘non-apnea’ Hypopneas/hours AHI = RDI = Apnea index plus hypopnea index. Both apneas and hypopneas are important since if they occur frequently enough (two common measures of ‘frequently enough’ are 5 and 10 events per hour), they disrupt sleep architecture in a fashion which reduces the percentage of time spent in REM (to oversimplify, ‘dreaming’) sleep which helps heal the mind and Delta (stage 3 and 4, or ‘very deep’ sleep) which helps the body heal the damage caused by daily physical stresses. I hope this gives you some clarification. If not, please supply this group with the summary results of your poly test. I am certain there will be several (I am one) folks who will help you understand that report in non-medical (and in some cases, pedantically medical) terms. On Wed, 23 Jun 2004 23:13:34 GMT, Snoozy <sno…@nowhere.net> wrote: >On my recent sleep study, my RDI was 18 per hour. I had only one >Apnea. Do RDI’s cause arrousals that disrupt sleep? I never got beyond >sleep stage 2 and have no REM sleep. The test collected only an hour of >data because I could not sleep. >~snoozy~
regards, eric pearson nonono.ericp1.non…@nonono.fuse.net
Response:
My test said AHI = 1, RDI = 18 Apnea/Hpopnea means event ten seconds or greater. So AHI does not necessarily = RDI No REM sleep. Only got to stage 2 sleep. Only one hour of sleep when the lab awoke me and the test was terminated. – Hide quoted text — Show quoted text -eric pearson wrote: > Snoozy, > Please clarify your question. > As best I understand it, RDI = AHI. > RDI and AHI are both equal to: > (total number of apneas + total number of hypopneas) / hours. > The most common definition of ‘apnea’ is a cessation of respiratory > airflow for 10 or more seconds. > The most common definition of ‘hypopnea’ is a 50% or more reduction in > respiratory airflow for 10 or more seconds. > Hypopneas are a ’superset’ of apneas, and apneas are a ’subset’ of > apneas by that definition. > The way the two most widely sold auto-titrating machines report is: > Apnea index = Apneas / hours > Hypopnea index = ‘non-apnea’ Hypopneas/hours > AHI = RDI = Apnea index plus hypopnea index. > Both apneas and hypopneas are important since if they occur frequently > enough (two common measures of ‘frequently enough’ are 5 and 10 events > per hour), they disrupt sleep architecture in a fashion which reduces > the percentage of time spent in REM (to oversimplify, ‘dreaming’) > sleep which helps heal the mind and Delta (stage 3 and 4, or ‘very > deep’ sleep) which helps the body heal the damage caused by daily > physical stresses. > I hope this gives you some clarification. If not, please supply this > group with the summary results of your poly test. I am certain there > will be several (I am one) folks who will help you understand that > report in non-medical (and in some cases, pedantically medical) terms. > On Wed, 23 Jun 2004 23:13:34 GMT, Snoozy <sno…@nowhere.net> wrote: > >On my recent sleep study, my RDI was 18 per hour. I had only one > >Apnea. Do RDI’s cause arrousals that disrupt sleep? I never got beyond > >sleep stage 2 and have no REM sleep. The test collected only an hour of > >data because I could not sleep. > >~snoozy~ > regards, > eric pearson > nonono.ericp1.non…@nonono.fuse.net
Response:
In article <40E34EC0.83BB6…@nowhere.net>, snoozy <sno…@nowhere.net> wrote: > My test said AHI = 1, RDI = 18 > Apnea/Hpopnea means event ten seconds or greater. > So AHI does not necessarily = RDI > No REM sleep. Only got to stage 2 sleep. Only one hour of sleep when the > lab awoke me and the test was terminated.
Is it possible that the RDI includes snoring arousals? Apparently some people have gotten CPAP treatment because of enough snoring arousals to cause daytime sleepiness, even with few Apneas and/or Hyopneas. Dan
