CHAPTER 19
Useful Formulae and Normal Values
“But in my opinion, all things in nature occur mathematically.”
—René Descartes
MEAN ARTERIAL PRESSURE (MAP) AND PULSE PRESSURE |
MAP = 1/3 × SBP + 2/3 × DBP Pulse pressure = SBP − DBP |
CARDIAC SITE | NORMAL PRESSURE RANGE |
LVEDP | 4–12 mm Hg |
PAWP mean | 2–12 mm Hg |
PAP “a” wave | 3–15 mm Hg |
PAP “v” wave | 2–12 mm Hg |
PAP mean | 10–16 mm Hg |
PAP systolic | 16–30 mm Hg |
PAP diastolic | 4–12 mm Hg |
RVSP | 16–30 mm Hg |
RVEDP | 1–8 mm Hg |
RAP mean | 1–7 mm Hg |
RAP “a” wave | 2–8 mm Hg |
RA “v” wave | 2–8 mm Hg |
SV = LVEDV − LVESV | Normal SV = 70–95 mL Normal LVESVI = 20–35 mL/m2 |
SVI = SV/BSA | Normal SVI = 35–60 mL/m2 |
CO = SV × HR | Normal CO = 5.2–7.5 L/minute |
CI = CO/BSA | Normal CI = 2.6–4.2 L/minute/m2 |
EF = LVEDV − LVESV/LVEDV | Normal EF = 60–75% Normal LVEDVI = 60–90 mL/m2 |
SYSTEMIC (SVR) AND PULMONARY VASCULAR RESISTANCE (PVR) | |
SVR = (MAP − CVP)/CO | Normal SVR = 800–1,600 dynes/second/cm-5 10–20 Wood Units |
PVR = (mean PAP − PAWP)/CO | Normal PVR = 40–130 dynes/second/cm-5, or 0.5–1.6 Wood Units |
SIMPLIFIED FORMULA FOR INTRACARDIAC LEFT-TO-RIGHT SHUNT CALCULATION |
Qp/Qs = (arterial O2 saturation − mixed venous O2 saturation)/(PAWP O2 saturation − PA O2 saturation) Qp − Qs = volume of simple left-to-right shunt  Stay updated, free articles. Join our Telegram channel
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