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RT forumulas!
the dreaded respiratory formulas that you never use except for exams.
Question | Answer |
---|---|
Pack years= | # of packs/day x # of years smoked. |
MAP= | (2x diastolic pressure) + Systolic ________________________________ 3 |
Fic equation: Cardiac output/QT= | V02 ___________________________________ C(a-v)o2 (10) |
Cardiac output= QT | HR x SV |
Stroke volume = | QT __________________________________ HR |
SVR= | (MAP-CVP) _____________________ x 80 QT |
PVR= | MPAP-PWP _____________________ x 80 QT |
Ca02 | (Hbg x 1.34 x Sa02) + (Pa02 x 0.003) Oxygen in RBC 02 in plasma |
Cvo2= | (Hbg x 1.34 x Svo2) + (Pvo2 x 0.003) |
Vo2= | QT x C(a-v)02 x 10 |
QS/QT | cco2-Cao2 _____________________ cco2-cvo2 |
Desired Pao2 | Current Fio2 x Desired Pao2 _______________________________ Current pao2 |
P/F ratio | Pao2/fio2 |
Pediatric drug dosage ESD= | wt (lbs) x normal adult dose _____________________________ 150 |
Amount of drug in mg. | Drug% x 10 x mL= number of mg in 1mL of the drug. |
Minute ventilation= | Vt x F |
Dynamic Compliance= | Exhaled volume __________________________ peak insp pressure - peep |
Static Compliance= | Exhaled volume __________________________ Plateau pressure - peep |
Raw= | Peak pressure-Plateau pressure |
IDBW for Males= | 106lbs + 6lbs/inch over 5ft |
IDBW for Females= | 105 lbs + 5lbs/inch over 5ft |
Calculating minimal flow rate= | (Vt x rate) x ( I+E) |
RSBI= | RR/VT= |
Duration of flow in tank | gauge pressure (psi) x tank factor __________________________________ liter flow |
Tank factor for E tank | .28/ L psi (0.3) |
Tank factor for H tank | 3.14 L psi (3.0) |
Total flow= | factor of tank used x liter flow |
Calculating patients max heart rate. | 220- HR |
calculating volume lost through chest tube | Vt-Vte= Lost Vt |