Test 2 Equations To Know Flashcards
1
Q
Equation for PAO2
A
PAO2 = PIO2 - (PaCO2 * 1.2)
2
Q
when breathing air at KUMC what is PIO2
A
PIO2 = (PB - 47) * .21 = 147 mmHg
3
Q
Total blood O2 content
A
Total blood O2 content = (Hb * 1.34 * % saturation) + (.003 * PO2)
4
Q
how do you calculate physiologic dead space
A
VD/VT = (PaCO2 - PECO2) / PaCO2
5
Q
how do you calculate compliance
A
change in lung volume / change in PTP
6
Q
how do you calculate airway resistance
A
(PB - Palv) / Airflow
7
Q
VA ~ VCO2/PaCO2 what does this mean?
A
Ventilation of arteries is a function of VCO2 and PaCO2
8
Q
what is normal FEV1/FVC
A
.75
9
Q
what is normal VD/VT
A
.2-.35
10
Q
what is RV/TLC normally
A
20-30%
11
Q
FRC/TLC normally is
A
.4
12
Q
what is normal Hb P50?
A
26 mmHg
13
Q
Normal values of PaO2 (A-a)PO2 Hb sat Hb concentration Total O2 content arterial PCO2 Arterial pH Plasma bicarbonate
A
PaO2 ~ 90-95 mm Hg (A-a)PO2 ~ 5-10 mm Hg Hb sat 95-100% Hb concentration = 15 g/dl Total O2 content ~ 20 ml/dl Arterial PCO2 ~ 40 mm Hg Arterial pH ~ 7.4 Plasma Bicarbonate ~ 24 mmol/l
