Oxygen Content and Delivery Calculations

Flashcards covering key formulas and concepts related to oxygen content, delivery, and hematology from the lecture notes.

O2 content formula

Cao2 = (1.34 x Hb x (Sat/100)) + (0.003 x Pao2)

O2 delivery formula

DO2 = CO x (1.39 x Hgb x SaO2 + (0.003 x PaO2))

O2 consumption formula

VO2 = (CaO2 - CvO2) x CO

C(a/v) formula

C(a/v) = (1.34 x Hgb x S(a/v)O2) + P(a/v)O2 x 0.0031

Reservoir drainage time

It takes (level/flow x 60) to drain the reservoir.

O2 saturation calculation

O2 saturation = content/capacity

Stroke Volume (SV) formula

SV = EDV – ESV

Ejection Fraction (EF) formula

EF = (SV/EDV) x 100

Cardiac Output (CO) formula

CO = HR x SV

Cardiac Index (CI) formula

CI = CO/BSA

Flow Rate formula

Flow Rate = BSA x CI

Body Surface Area (BSA) formula

BSA (m2) = √((kg x cm)/3600)

Estimated Blood Volume (PBV) formula

PBV = kg x 70mL (adults)

Dilutional Hematocrit (Hct) formula

Dilutional Hct = (PBV)(Hct)/TBV

Total Blood Volume (TBV) formula

TBV = PBV + Prime

PRBCs calculation

PRBCs are calculated at a hematocrit of 60% if added to prime.

Pulse Pressure formula

Pulse Pressure = systolic – diastolic

Mean Arterial Pressure (MAP) formula

MAP = diastolic + (PP/3)

Systemic Vascular Resistance (SVR) formula

SVR = (MAP - RAP) / CO x 80

Pulmonary Vascular Resistance (PVR) formula

PVR = (PAM - LAP) / 80 x 80

HCO3 correction formula

HCO3 Correction = (BE x kg) / 4

Hemoglobin oxygen carrying capacity

Each gram of hemoglobin carries 1.34mL of oxygen.

Oxygen solubility in blood

The solubility of oxygen in the blood is 0.0031mL/dL.

Weight conversions

There are 453 grams in a pound and 28.3 grams in an ounce.

Micrograms per drop calculation

Calculate micrograms per drop with 50mg/ml Nipride in 500ml D5W (60 drops/ml) = 1.667.

KCL concentration in CPG solution

To achieve 30 meq/l KCL in a CPG solution, add 30mEq of KCL to 0.9% NaCl.

Resulting Hematocrit in mixed blood

Mixing 5 liters of blood with Hct of 45% and 3 liters with Hct of 25% results in 37.5%.