Instructions for Use
CPET
page 60
Version: 4 | Release date: 01 April 2022
Name
Unit
Description
VIn
l
Inspired volume
tIn
s
Duration of inspiration
Vt
l
Tidal volume
Bf
1/min
Breathing frequency
VE
l/min
Minute Ventilation
BR
l/min
Breathing reserve
BR = MVV - VEpeak
MVV = Maximum Voluntary Volume (FEV1x35)
VEpeak is Minute Ventilation at VO
2
max
BR
%
Breathing reserve
BR = (MVV – VEpeak)/MVV * 100
VE/VO
2
-
Ventilatory equivalent for O
2
Minute Ventilation divided by Oxygen uptake
VE/VCO
2
-
Ventilatory equivalent for CO
2
Minute Ventilation divided by Carbon Dioxide
production
Vd(g)
l
Dead space volume (noninvasive calculation)
Vt = Tidal volume
PaCO
2
= arterial PCO
2
PECO
2
= mixed expired PCO
2
Vdm= mask dead space
Vd(g)/Vt
%
Dead space - tidal volume ratio (noninvasive
calculation)
VE =
∫ 𝐹𝐹𝐹𝐹𝑥𝑥
(
𝑡𝑡
)
𝑑𝑑𝑡𝑡
𝑇𝑇
0
𝑉𝑉𝑑𝑑
=
𝑉𝑉𝑡𝑡
𝑥𝑥
𝑃𝑃𝐹𝐹𝑃𝑃𝐹𝐹𝐹𝐹
2
− 𝑃𝑃𝐹𝐹𝐹𝐹𝐹𝐹
2
𝑃𝑃𝐹𝐹𝑃𝑃𝐹𝐹𝐹𝐹
2
− 𝑉𝑉𝑑𝑑𝑉𝑉
𝑉𝑉𝑑𝑑
(
𝑔𝑔
)
𝑉𝑉𝑡𝑡
=
𝑃𝑃𝐹𝐹𝑃𝑃𝐹𝐹𝐹𝐹
2
− 𝑃𝑃𝐹𝐹𝐹𝐹𝐹𝐹
2
𝑃𝑃𝐹𝐹𝑃𝑃𝐹𝐹𝐹𝐹
2
−
𝑉𝑉𝑑𝑑𝑉𝑉
𝑉𝑉𝑡𝑡
− 𝑉𝑉𝑑𝑑𝑉𝑉
