Skip to Main Content

INTRODUCTION

Arterial oxygen content of the blood:

CaO2(mLO2/dL)=(SaO2×Hemoglobin×1.36)+0.003*(PaO2)
  • 0.003*PaO2 represents the fraction of dissolved oxygen in the blood

Venous oxygen content of the blood:

CvO2(mLO2/dL)=(SvO2×Hemoglobin×1.36)+0.003*(PvO2)

Arterial-mixed venous oxygen content difference:

avDO2=CaO2CvO2
  • CaO2 ∼20 mL/dL

  • CvO2 ∼15 mL/dL

  • Oxygen extraction is approximately 25%; it can also be estimated by:

  • SaO2 − SvO2

Favorite Table | Download (.pdf) | Print
Cardiac Output: CO = HR × SV Units: L/min
Cardiac Index: CI = CO/BSA in m2 Nl 3.6 – 6 L/min/m2

  • CI more used for children as it normalizes for size

Oxygen Delivery: DO2 = CO × CaO2 × 10

Oxygen Consumption: VO2 = CO × (CaO2 − CvO2) × 10

Oxygen Extraction Ratio: O2ER = VO2/DO2 = [(CaO2 − CvO2)/CaO2]

Pulmonary Vascular Resistance: PVR = (PAP − PAOP)/CO × 79.9 dynes*sec/cm5

Systemic Vascular Resistance: SVR = (MAP – RAP)/CO × 79.9 dynes*sec/cm5

  • If you don't multiply by 79.9, then use Woods units OR mmHg/L/min

  • PAP – Pulmonary artery pressure

  • PAOP – Pulmonary artery occlusion pressure

  • MAP – Mean arterial pressure

  • RAP – Right atrial pressure

Favorite Table | Download (.pdf) | Print
SVR Index: SVRI = SVR/BSA Nl: 800 to 1600 dyne-s/cm5/m2
PVR Index: PVRI = PVR/BSA Nl: 80 to 240 dyne-s/cm5/m2

Normal Pediatric Hemodynamic Variables - See Table 27-1

TABLE 27-1

Normal Pediatric Hemodynamic Parameters

Pop-up div Successfully Displayed

This div only appears when the trigger link is hovered over. Otherwise it is hidden from view.