Minute Vent, Tidal Volume, etc.

[MrIvanDrago]

Could someone give me a simple explanation of what Minute Vent is and how it relates to Tidal Volume or other metrics in OSCAR data? 

I did some searching, but looking for a simple explanation of how this numbers 'should' look for optimal therapy and heath.

I know there is a calculation for approx. tidal volume based on height and weight maybe? 
For reference, I am 6'4" 235lbs. No lung or COPD issues.

[Jay51]

Sure.  Minute ventilation = Tidal volume (amount of air inhaled with each single inhalation in ml) x respiratory rate (per minute).  

Normal minute vent can vary a little bit during sleep.  Normal respiratory rate during sleep is approximately 12 to 20, but can vary also.  

Usually when a person's respiratory rate decreases, tidal volume increases to compensate and keep minute vent steady.  

When respiratory rate increases, tidal volume usually decreases to compensate and keep minute vent relatively steady.  

Use your height in the online calculators to get your ideal tidal volume (and use either your OSCAR median respiratory rate, or 15 or so).  At 6'4, your minute vent would be higher than the "average" minute vent values that they use in most studies.

[CPAPfriend]

Normal minute vent is about 5-8 L/min. Resmed ASV machines stabilize minute vent to treat CAs.
Normal tidal volume about 500 mL for men, 400 mL for women. Phillips ASVs manage tidal volume to treat CAs.
Normal tidal volume is 6-8mL/kg and then 80-120% of this prediction. Anything higher than 10 mL/kg is associated with increased barotrauma of the lungs.

Tidal volume = ideal body weight (IBW) x (5-8 mL/kg)

IBW(female, inches) = 45.5 + (2.3(height in inches - 60))
IBW(male, inches) = 50 + (2.3(height in inches - 60))

IBW(female, metric) = 45.5 + (0.9(height in centimeters - 152 cm))
IBW(male, metric) = 50 + (0.9(height in centimeters - 152cm))

IBW(you) = 50 + (2.3(76 inches - 60 inches))
IBW(you) = 86.8 kg

Tidal volume(you) = 86.8kg(5-8mL/kg)
Tidal volume(you) = 434mL - 694 mL (80 to 120% of this estimate is considered within range)

[rhishi]

So not OP but this is really helpful. 
And this we can compare with Statistical Med. tidal volume we see on oscar or 95%?

[paulag1955]

The resulting range seems quite low for an average (5'4") height woman.

[Jay51]

Thank you looking that info up and posting it CPAPfriend.  Yes.  Try to calculate your own personal average base on height, or ideal body weight, etc.  There are numerous online calculators also (and they all vary a bit).  

I then compare mine to my median in OSCAR (or even 95%, or the low %, etc.).  The value of doing this is to see if you are close to what you calculated.  If it is close, then you most likely don't have any concerns.  If your OSCAR values differ significantly from these, it could be an indicator that something is wrong.