Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
33 Cards in this Set
- Front
- Back
|
Laplaces Law equation? interpretation?
|
2T/r
As you increase radius you dilute surfactant so that T and r increase together. This keeps pressure in the airways equal and prevents collapse of small --> large |
|
|
Minute ventilation equation?
|
VE = f*Vd + f*Va
|
|
|
PECO2?
PACO2 |
PECO2 = mixed expired air = measured at the mouth
PACO2 = alveolar CO2 |
|
|
Fraction of tital volume that is physiological deadspace
|
VD/VT = PACO2 - PECO2/PACO2
|
|
|
Henry's Law
|
Cx = Px*Sx
|
|
|
Alveolar ventilation equation?
|
VA = VCO2 [(PB-47)/PACO2]
|
|
|
Respiratory quotient?
|
VCO2/VO2
normally 0.8 |
|
|
PAO2 equation?
|
PAO2 = PIO2 - [PACO2/R]
|
|
|
% saturation of hgB?
|
O2bound /O2 capacity
O2 capacity hgb = 15g/dL * 1.34mL O2/gm |
|
|
% saturation?
|
total O2 content - dissolved O2/O2capacity
|
|
|
concentration of disolved O2?
|
0.3 mL O2/dL
|
|
|
FEV1/FVC
|
normally 80%
low values suggest obstruction or lack of driving pressure |
|
|
Changes in Fibrosis or scoliosis:
FVC FEV1 FEV1/FVC |
FVC = <80%
FEV1 = reduced FEV1/FVC = normal |
|
|
Changes in obstruction:
FVC FEV1 FEV1/FVC |
FVC = normal or reduced
FEV1 = reduced <80% FEV1/FVC = reduced <70% |
|
|
How to convert PAO2 to [O2] dissolved?
|
[O2] = PA02 · 0.003
|
|
|
Bicarb buffer equation?
|
pH = 6.1 + log [HCO3- ] / 0.03 PCO2
0.03 is in mMoles/L/mmHg HCO3 is in mMoles |
|
|
Normal values:
RBF = ? RPF = ? GFR = ? |
RBF = 1 L blood/min
RPF = 0.6RBF = 600ml/min GFR = 0.2 RPF = 125 ml/min |
|
|
Ex =? (2 equations; general and physiological)
|
Ex = Fx + Sx - Rx
Ex = Ux * V |
|
|
Fx =?
|
Px * GFR
|
|
|
Cx = ?
Cx of inulin? Cx of PAH? |
Cx = (Ux * V)/Px
Cx of inulin = GFR b/c all inulin is filtered and excreted with no secretion or reabsorbtion Cx of PAH = RPF |
|
|
calculate RBF using HCT
|
RBF = RPF * (1/1-Hct)
|
|
|
FF =?
|
GFR/RPF
|
|
|
Rate of reabsorbtion?
|
reabsorbed = filtered - excreted
Rx = (Px * GFR) - (Ux * V) |
|
|
Percentage of a filtered solute reabsorbed?
|
= rate of reabsorbtion/rate of filtration
(Px * GFR) - (Ux * V)/(Px*GFR) |
|
|
relationship between plasma creatnine and GFR?
|
if Pcreat increases GFR is decreased
If Pcreat decreases GFR is increased |
|
|
%H20 reabsorbed using Ux and Px?
|
%H2O = 1 - 1/(U/P)
|
|
|
a drop of ______ pH unit will result in an average increase of _______ mEq/L in plasma K
|
a drop of 0.1 pH unit will result in an average increase of 0.6 mEq/L in plasma K
|
|
|
Free water clearance equations
|
CH20 = V - Cosm
CH2O = V[1-U/P] |
|
|
Positive CH2O?
Negative CH2O? |
Positive = water is excreted
Negative = water is reabsorbed |
|
|
Acid base equation
pH = ? |
pH = 6.1 + log [HCO3]/0.03pCO2
pH = 6.1 + log [HCO3- ] / 0.03 PCO2 0.03 is in mMoles/L/mmHg HCO3 is in mMoles |
|
|
NAE = ?
|
Net Acid Excretion
NAE = Utitration + UNH4+ - UHCO3 |
|
|
anion gap
|
anion gap = [Na] - ([Cl] + [HCO3])
normal = 5-11 |
|
|
Acids that increase anion gap?
|
lactic acid or ketoacid
|
