RDI AHI

I was playing around with Sleepy Head and saw RDI. What is the difference in the two? Is there any reason to show one over the other?

Stormynights wrote:I was playing around with Sleepy Head and saw RDI. What is the difference in the two? Is there any reason to show one over the other?

Hi Stormynights!

RDI is more inclusive.

Apnea Hypopnea Index (AHI) is all apneas plus all hypopneas divided by hours.

Respiratory Disturbance Index (RDI) is all apneas plus hypopneas plus all respiratory disturbances not otherwise named divided by hours.

Have a great week!

Todzo

Todzo wrote:

Stormynights wrote:I was playing around with Sleepy Head and saw RDI. What is the difference in the two? Is there any reason to show one over the other?

Hi Stormynights!

RDI is more inclusive.

Apnea Hypopnea Index (AHI) is all apneas plus all hypopneas divided by hours.

Respiratory Disturbance Index (RDI) is all apneas plus hypopneas plus all respiratory disturbances not otherwise named divided by hours.

Have a great week!

Todzo

Thank you for the reply.

Stormy, where did you find the RDI ? I play ( look at Data ) on my s9 every morning and I haven't yet to see the RDI thingy ?

DannyPh wrote:Stormy, where did you find the RDI ? I play ( look at Data ) on my s9 every morning and I haven't yet to see the RDI thingy ?

When you go to preferences on cpap tab You can change from AHI to RDI.

DannyPh wrote:Stormy, where did you find the RDI ? I play ( look at Data ) on my s9 every morning and I haven't yet to see the RDI thingy ?

For RDI you need the RERA/UAR and the S9 don't measure it.


By the poster -SWS:


Dr. Sullivan and a few others suggested devising a new sleep-disordered-breathing (SDB) severity index or set of indices because they felt AHI was inadequate. Rather, they contended that a new, more indicative index of sleep-disordered-breathing severity should contain much of what AHI contains as well as other daytime severity-of-symptom benchmarks. Doctor Sullivan's proposal has not yet gained wide enough acceptance within the medical community, however. Not to confuse this proposal of a new (and still undevised) SDB-severity index with either AHI or RDI.

The RDI index was, indeed, devised after the AHI index. This RDI index was comprised to factor in AHI as well as RERA/UARS type disturbances as Andy points out. In the "laissez-faire" international medical community, some continued to use AHI, while others used RDI, while yet others treated the two indices as if they were synonomous and identical (contrary to the slight difference between the two). In the U.S. the RDI index seems to have fallen out of favor as accurate measurement of RERA/UARS events does not typically occur in most sleep centers. Esophagael manometry (the gold standard of measurement for RERA/UARS events) tends to be employed more in research and teaching type sleep clinics. In the U.S. these are the two types of sleep clinics that still quite often provide RDI measurements in addition to the simpler and more common AHI measurement.

BTW, AHI, RDI, SDB, UARS, RERA, IMHO do we have enough acromyms??

[ June 15, 2004: Message edited by: -SWS ]

AVI thank you for the information.

Danny: RDI is available on Sleepyhead.
I look at my screen every morning, and it is not there--have to use software.