Overview; Calculating The Body Surface Area - Dräger Infinity M540 Instructions For Use Manual

Calculations

Overview

With the physiological calculations option, the
Cockpit performs physiological calculations using
data acquired by the M540 and other devices. The
Cockpit stores derived parameters and displays
them.
When the Cockpit is connected to the network, you
can obtain laboratory data through the Trends/
Data... page.
The Cockpit can also be configured to calculate
drug-related parameters, including concentration,
rate, total dose, and total volume.
In addition to the standard calculation features, two
additional features are available with the
physiological calculations software option:
– Hemodynamics – the Cockpit calculates
hemodynamic parameters based on cardiac
output, invasive blood pressure, and other data
(see page 187).
– Hemo/Oxy/Vent Calculations – the Cockpit
calculates oxygenation and ventilation
parameters (see page 189) in addition to
hemodynamic parameters.
182 Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n

Calculating the body surface area

The Ht (height) and current Wt (weight) values are
used to compute the BSA (body surface area) in
2
m . For adult and pediatric patients, these values
are pulled automatically from the Demographics
page which is populated during patient admission
(see page 102). Because of changing body weight,
you must enter the weight manually for neonates.
This is to make sure that the most current value is
used to calculate the BSA.
The BSA value is required for all indexed calcula-
tions such as cardiac index (CI). The available units
for height are cm and inches. The available units for
weight are kg, g, ounces, lb.
The following Boyd or DuBois equations are used
to compute the BSA.
The Boyd equation is used for patients whose
weight is less than15 kg and whose height is less
than 80 cm:
Boyd equation
(0.7285 - 0.0188 x log10WT)
BSA = Wt
0.0003207
DuBois equation
0.425 0.725
BSA = Wt x Ht
Note:
Wt = Weight, Ht = Height, BSA = Body surface area
0.3
x Ht x
x 0.007184