Edwards HemoSphere

E
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Appendix
Computation Constants
E.1 Computation Constant Values
In iCO mode, the HemoSphere Swan-Ganz module computes cardiac output employing either a bath probe
setup or an in-line temperature probe using the computation constants listed in the following tables. The
HemoSphere Swan-Ganz module automatically senses the type of injectate temperature probe being used,
and the corresponding injectate temperature, catheter size, and injectate volume define the computation
constant to be used.
NOTE The computation constants given below are nominal and generally applicable to the
specified catheter sizes. For computation constants specific to the catheter being used,
refer to the catheter directions for use.
Model-specific computation constants are entered manually in the setup menu for the
iCO mode.
* To optimize cardiac measurement, it is recommended that the temperature of the injectate correspond to
one of the temperature ranges listed in the catheter’s directions for use.
Table E-1 Computation constants for bath temperature probe
Injectate
temperature
range* (°C)
Injectate
volume
(mL)
Catheter size (French)
8 7.5 7 6 5.5
Room temp.
22.5–27 °C
10
5
3
0.612
0.301
0.177
0.594
0.283
0.159
0.595
0.287
0.165
0.607
0.304
0.180
0.616
0.304
0.180
Room temp.
18–22.5 °C
10
5
3
0.588
0.283
0.158
0.582
0.277
0.156
0.578
0.274
0.154
0.597
0.297
0.174
0.606
0.298
0.175
Cold (iced)
5–18 °C
10
5
3
0.563
0.267
0.148
0.575
0.267
0.150
0.562
0.262
0.144
0.573
0.278
0.159
0.581
0.281
0.161
Cold (iced)
0–5 °C
10
5
3
0.564
0.262
0.139
0.564
0.257
0.143
0.542
0.247
0.132
0.547
0.259
0.144
0.555
0.264
0.148
Status = Released Printed Date: 2018-01-16 Released Date: 2017-09-14