Edwards HemoSphere

198
HemoSphere Advanced Monitor C Equations for Calculated Patient Parameters
CvO
2
Venous Oxygen Content
CvO
2
= (0.0138 x HGB x SvO
2
) + (0.0031 x PvO
2
) (mL/dL)
CvO
2
= [0.0138 x (HGB
SI
x 1.611) x SvO
2
] + [0.0031 x (PvO
2
SI
x7.5)] (mL/dL)
where:
HGB – Total Hemoglobin, g/dL
HGB
SI
– Total Hemoglobin, mmol/L
SvO
2
– Venous O
2
Saturation, %
PvO
2
– Partial Pressure of Venous Oxygen, mmHg
PvO
2
SI
– Partial Pressure of Venous Oxygen, kPa
and PvO
2
is assumed to be 0
mL/dL
Ca-vO
2
Arteriovenous Oxygen Content Difference
Ca-vO
2
= CaO
2
- CvO
2
(mL/dL)
where:
CaO
2
– Arterial Oxygen Content (mL/dL)
CvO
2
– Venous Oxygen Content (mL/dL)
mL/dL
CI Cardiac Index
CI = CO/BSA
where:
CO – Cardiac Output, L/min
BSA – Body Surface Area, m
2
L/min/m
2
CPI Cardiac Power Index
CPI = MAP× CI × 0.0022
W/m
2
CPO Cardiac Power Output
CPO = CO × MAP × K
where:
cardiac power output (CPO) (W) was calculated as MAP × CO/451
K is the conversion factor (2.22 × 10
-3
) into watts
MAP in mmHg
CO L/min
W
DO
2
Oxygen Delivery
DO
2
= CaO
2
x CO x 10
where:
CaO
2
– Arterial Oxygen Content, mL/dL
CO – Cardiac Output, L/min
mL O
2
/min
DO
2
I Oxygen Delivery Index
DO
2
I = CaO
2
x CI x 10
where:
CaO
2
– Arterial Oxygen Content, ml/dl
CI – Cardiac Output, L/min/m
2
mL O
2
/min/m
2
dP/dt Maximal first derivative of arterial pressure waveform with respect to time
dP/dt = max(P[n+1]-P[n])/ts, for n=0 to N=1
where:
P[n] – current sample of the arterial pressure signal, mmHg
ts – sampling time interval, second
N – total number of samples in a given cardiac cycle
mmHg/sec
Table C-1 Cardiac and oxygenation profile equations (continued)
Parameter Description and formula Units
Status = Released Printed Date: 2018-01-16 Released Date: 2017-09-14