Inspiratory-expiratory ratios

[1210donna]

I have mixed apnea and just moved from CPAP to VPAP
first time I feel it has been 'me' breathing assisted by the machine more than 'forced' to breathe
I told the technition at MCS that the back pressure on breathing out made my reflexes 'ready' to breathe back in
and that on CPAP I felt I was breathing out too fast and so not triggering the 'readiness' to breathe back in.... turns out I was right...

the I:E ratio is supposed to be 1:2 or 1:3

on VPAP the Inspiratory time was finally lower than the Expiratory time ... and looking back this is the FIRST time that ratio has been in the right order.... also number of apneas for the entire night = 0

Insp Time Inspiratory Time (seconds)
W-Avg: 1.60 0.00 1.46 2.80 4.98
Exp TimeExpiratory Time (seconds)
W-Avg: 3.13 0.58 3.08 4.10 6.72


I looked at the stats and found that my inspiratory-expiratory times on CPAP were inverted ....
the expiratory times were consistently always lower than my inspiratory times

now if you have any idea what this means, let me know... all I know is that the I:E should be around 1:2 or 1:3 and on CPAP it was in reverse.
I'm surprised that nobody at the CPAP services noticed this or said anything.

ie
AUG on CPAP

Insp TimeInspiratory Time (seconds)
W-Avg: 2.37 0.52 2.38 3.08 4.18
Exp TimeExpiratory Time (seconds)
W-Avg: 1.80 0.04 1.80 2.40 2.86

Insp TimeInspiratory Time (seconds) W-Avg: 2.32 0.46 2.34 2.96 3.58
Exp TimeExpiratory Time (seconds) W-Avg: 1.84 0.08 1.86 2.32 2.68

Insp TimeInspiratory Time (seconds) W-Avg: 2.56 0.54 2.58 3.28 4.54
Exp TimeExpiratory Time (seconds) W-Avg: 1.71 0.00 1.68 2.28 3.30

Insp TimeInspiratory Time (seconds) W-Avg: 2.51 0.56 2.54 3.26 4.08
Exp TimeExpiratory Time (seconds) W-Avg: 1.64 0.04 1.64 2.20 2.80

Insp TimeInspiratory Time (seconds) W-Avg: 2.27 0.64 2.26 3.02 4.49
Exp TimeExpiratory Time (seconds) W-Avg: 1.91 0.04 1.92 2.56 3.08

Insp TimeInspiratory Time (seconds) W-Avg: 2.47 0.66 2.52 3.16 3.88
Exp TimeExpiratory Time (seconds) W-Avg: 1.84 0.06 1.84 2.56 3.08

Insp TimeInspiratory Time (seconds) W-Avg: 2.15 0.54 2.14 2.82 3.48
Exp TimeExpiratory Time (seconds) W-Avg: 1.96 0.08 1.96 2.60 2.88

Insp TimeInspiratory Time (seconds) W-Avg: 2.28 0.60 2.28 2.94 3.80
Exp TimeExpiratory Time (seconds) W-Avg: 2.01 0.06 2.02 2.66 3.00

Insp TimeInspiratory Time (seconds) W-Avg: 2.37 0.58 2.36 3.06 4.56
Exp TimeExpiratory Time (seconds) W-Avg: 1.83 0.04 1.84 2.42 2.86

Insp TimeInspiratory Time (seconds) W-Avg: 2.39 0.20 2.36 3.26 5.48
Exp TimeExpiratory Time (seconds) W-Avg: 1.86 0.04 1.88 2.60 3.30

Insp TimeInspiratory Time (seconds) W-Avg: 2.35 0.60 2.38 3.04 3.78
Exp TimeExpiratory Time (seconds) W-Avg: 1.89 0.04 1.84 2.74 3.12

Insp TimeInspiratory Time (seconds) W-Avg: 2.34 0.48 2.36 3.00 3.84
Exp TimeExpiratory Time (seconds) W-Avg: 1.85 0.04 1.84 2.52 2.92

Insp TimeInspiratory Time (seconds) W-Avg: 2.37 0.64 2.38 3.08 3.84
Exp TimeExpiratory Time (seconds) W-Avg: 1.91 0.04 1.90 2.63 3.08

Insp TimeInspiratory Time (seconds) W-Avg: 2.40 0.52 2.42 3.08 3.88
Exp TimeExpiratory Time (seconds) W-Avg: 1.86 0.04 1.84 2.58 3.04

nsp TimeInspiratory Time (seconds) W-Avg: 2.34 0.50 2.36 3.00 3.64
Exp TimeExpiratory Time (seconds) W-Avg: 2.00 0.04 2.00 2.68 3.04

Insp TimeInspiratory Time (seconds) W-Avg: 2.36 0.44 2.38 3.02 3.72
Exp TimeExpiratory Time (seconds) W-Avg: 1.98 0.04 1.98 2.58 3.04

Insp TimeInspiratory Time (seconds) W-Avg: 2.41 0.32 2.44 3.06 3.84
Exp TimeExpiratory Time (seconds) W-Avg: 2.00 0.04 2.00 2.84 3.24

Insp TimeInspiratory Time (seconds) W-Avg: 2.39 0.48 2.42 3.06 3.80
Exp TimeExpiratory Time (seconds) W-Avg: 1.90 0.06 1.86 2.68 3.24

Insp TimeInspiratory Time (seconds) W-Avg: 2.12 0.64 2.08 2.80 3.86
Exp TimeExpiratory Time (seconds) W-Avg: 2.03 0.04 2.08 2.68 3.04

Insp TimeInspiratory Time (seconds) W-Avg: 2.18 0.62 2.18 2.80 3.61
Exp TimeExpiratory Time (seconds) W-Avg: 2.02 0.16 2.02 2.72 3.22

Insp TimeInspiratory Time (seconds) W-Avg: 2.24 0.58 2.24 2.90 3.64
Exp TimeExpiratory Time (seconds) W-Avg: 1.88 0.04 1.90 2.54 2.96

Insp TimeInspiratory Time (seconds) W-Avg: 2.38 0.64 2.40 3.12 3.98
Exp TimeExpiratory Time (seconds) W-Avg: 1.95 0.04 1.90 2.76 3.20

[JDS74]

My numbers look very similar.

I, too, would love to know if this means anything.

My breathing pattern while awake seems to be in the regular order of inhale time less than exhale time.
At night, with my CPAP on, the pattern is reversed with my exhale time is less than the inhale time, so much so that it is noticeable to me.

[tanoury]

I'm very interested in this too. My IE ratio is also inverted in sleepyhead:

8/27/2013
Channel Min Med 95% Max
Inspiratory Time (seconds)
W-Avg: 0.52 3.60 4.80 6.46
Expiratory Time (seconds)
W-Avg: 0.20 0.86 1.46 2.06


8/28/2013
Channel Min Med 95% Max
Inspiratory Time (seconds)
W-Avg: 0.46 2.72 4.40 5.26
Expiratory Time (seconds)
W-Avg: 0.12 0.72 1.06 1.72

[JDS74]

Just talked to my pulmonologist this morning and showed him the data showing I-E inversion.
He says that if the minute ventilation is sufficient, then the inversion has no medical significance.
In my case the minute vent. value was, on average, 9.88 L/min.