Cardiac output
●
The technique used in performing a cardiac output.
●
Temperature of the injectate solution.
●
Volume of the injectate solution.
●
Patient’s baseline blood temperature.
●
Patient’s inspiratory/expiratory cycle.
●
Placement of catheter with relation to proximity of lung field.
●
The pulmonary artery catheter itself.
●
The patient’s rhythm and hemodynamic status.
●
Any other rapid IV solutions which are infused while the cardiac output is being
performed.
The following are suggestions about technique that can help obtain accurate cardiac
output:
●
Always hold the syringe by the plunger, not the barrel.
●
Inject solution rapidly and smoothly.
●
Inject within four to five seconds.
●
Inject at end expiration.
●
When not using an automatic program, wait one minute between injections to
allow baseline to stabilize.
●
The temperature of the injectate should always be colder than blood temperature.
Keep the handling and waiting time with a filled syringe before injection as short as
possible. Warm injectate may lead to erroneous C.O. values.
●
The probe can be a bath probe continuously measuring the cooling bath
temperature or the infusion bag temperature. Alternatively, a flow-through probe is
used for a closed injectate delivery. With an in-line system, the displayed injectate
temperature is the lowest temperature measured during injection.
C.O. troubleshooting
Problem
Solution
C.O. measurement fails?
The amount of injectate is too small or the injectate
is too warm.
●
Inject smoothly and within 4 to 5 seconds.
What if the C.O. value is lower than expected?
Cardiac output must be computed within 20
seconds. Decreasing the volume and increasing
the temperature will give you a smaller differential
change and should increase the chance of computing
a cardiac output within the 20-second period.
●
Decrease the volume injected.
●
Increase the temperature of the injectate.
270
CARESCAPE Modular Monitors
2062971-001
Summary of Contents for CARESCAPE
Page 38: ...38 CARESCAPE Modular Monitors 2062971 001 ...
Page 114: ...Setting up the monitor before use 114 CARESCAPE Modular Monitors 2062971 001 ...
Page 146: ...Alarms 146 CARESCAPE Modular Monitors 2062971 001 ...
Page 218: ...Pulse oximetry 218 CARESCAPE Modular Monitors 2062971 001 ...
Page 234: ...Non invasive blood pressure 234 CARESCAPE Modular Monitors 2062971 001 ...
Page 260: ...Temperature 260 CARESCAPE Modular Monitors 2062971 001 ...
Page 274: ...Cardiac output 274 CARESCAPE Modular Monitors 2062971 001 ...
Page 280: ...Mixed venous oxygen saturation SvO 280 CARESCAPE Modular Monitors 2062971 001 ...
Page 338: ...Patient Spirometry 338 CARESCAPE Modular Monitors 2062971 001 ...
Page 372: ...Neuromuscular transmission 372 CARESCAPE Modular Monitors 2062971 001 ...
Page 404: ...Laboratory data 404 CARESCAPE Modular Monitors 2062971 001 ...
Page 410: ...Calculations 410 CARESCAPE Modular Monitors 2062971 001 ...
Page 416: ...Drug calculations 416 CARESCAPE Modular Monitors 2062971 001 ...
Page 424: ...Trends 424 CARESCAPE Modular Monitors 2062971 001 ...
Page 432: ...Snapshots and events 432 CARESCAPE Modular Monitors 2062971 001 ...
Page 462: ...Cleaning and care 462 CARESCAPE Modular Monitors 2062971 001 ...
Page 528: ...Abbreviations yr year yrs years 528 CARESCAPE Modular Monitors 2062971 001 ...
Page 546: ...Skills checklist 546 CARESCAPE Modular Monitors 2062971 001 ...
Page 547: ...content ...