Some definitions

I think this question has already been asked in the past but it could be good to have a refresh. Could somebody please explain what is and what does it implies:
a) Tidal volume
b) Resp Rate
c) % in PB

Thanks very much

Rosie

Tidal volume...The amount of air passing in and out of the lungs for each breath in milliliters.

Respiration Rate....number of breaths we take per minute

% of PB....percentage of time spent in Periodic Breathing. It can look like Cheyenne Stokes Respiration but doesn't always look like CSR.
Per clinical manual.... Periodic Breathing being defined as the persistent waning and waxing breathing pattern which repeats itself between 30 and 100 seconds. The nadir of the breathing pattern is characterized by at least 40% reduction in airflow from an established baseline. The pattern must be established for several minutes before it can be identified as Periodic Breathing.
No therapy adjustments are made in response to Periodic Breathing.

Edit for personal comment: Normal values will be highly personal. We aren't really given a chart to go by with these values to try to determine if there is a problem or not. PB % is not a huge problem unless it is obvious that a lot of time is spent in PB every night. Some PB is normal from time to time in just about everyone.

Edit for Minute Vent per Encore Pro Glossary
Minute Vent......The average minute ventilation (tidal volume x rate) measured per hour of use.

Significance? I have no idea at the moment.

Thanks very much Pugsy

Pugsy I forgot one definition, sorry. If you answer you could maybe Edit your first answer to include this one and have all in the same place, thanks again.

Minute Vent. ?

Minute vent added to other terms.

Pugsy wrote: Edit for Minute Vent per Encore Pro Glossary
Minute Vent......The average minute ventilation (tidal volume x rate) measured per hour of use.

That doesn't make sense. At least the "hour" bit doesn't.

"Minute ventilation" is the amount of air you've inhaled or exhaled* per minute. i.e. if every time you exhaled, you blew the air out into a bag, that's how many liters of air would be in the bag after one minute.

In some sense, "minute vent" is what really matters. It's how much "useful" air you've got flowing into your lungs.

*Hopefully, inhale volume equals exhale volume.

The SleepyHead 0.8.8-2 update I just uploaded shows tooltips when hovering over the Y-axis areas, that show the full names and units..

Fixes some other nasty glitches too..

Hopefully some will find the tooltips helpful.

archangle wrote: That doesn't make sense. At least the "hour" bit doesn't.

I know. I didn't make the definition though....I just copied it as in copy/paste so I wouldn't make an error typing.

So I found this. Please note area I highlighted in red.

http://en.wikipedia.org/wiki/Respiratory_minute_volume

espiratory minute volume (or minute ventilation) is the volume of gas inhaled (inhaled minute volume) or exhaled (exhaled minute volume) from a person's lungs in one minute. It is an important parameter in respiratory medicine due to its relationship with blood carbon dioxide levels. It can be measured with devices such as a Wright respirometer, or can be calculated from other known respiratory parameters. Note that although its name implies that it is a volume, minute volume is actually a flow (it represents a volume change over time).

Determination of minute volume

Minute volume can either be measured directly or calculated from other known parameters.
[edit] Measurement of minute volume (see link as images didn't copy)

Minute volume is the amount of gas inhaled or exhaled from a person's lungs in one minute. It can be measured by a Wright respirometer or other device capable of cumulatively measuring gas flow, such as mechanical ventilators.
[edit] Calculation of minute volume (see link as images didn't copy)

If both tidal volume (VT) and respiratory rate (ƒ or RR) are known, minute volume can calculated by multiplying the two values.

\dot{V} = V_T \times f

http://en.wikipedia.org/wiki/Ventilatio ... siology%29
Minute ventilation \dot{V} = tidal volume * respiratory rate[1][2] the total volume of gas entering the lungs per minute.

Thanks very much