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Invasive Pressures
Problem:
Why do I have different values between my Arterial,
Non-Invasive (oscillometric), and Non-Invasive
(auscultated) BP readings?
Answer:
All three measurements use different technologies.
Intervention:
■ Auscultation and oscillometric are both INDIRECT
methods of measuring blood pressure. In
auscultation, changes in arterial sounds during cuff
deflation are related to systolic and diastolic
pressure. In oscillometric, changes in measured
pressure oscillations during cuff deflation are
related to systolic, mean and diastolic pressures.
Changes in the vascular tone of the arterial system
can cause these two indirect methods to differ from
one another AND from direst arterial pressure.
Invasive Arterial Blood Pressure is a DIRECT
method of measuring blood pressure. Differences are
expected between direct and indirect measurements
of blood pressure. These differences occur because
DIRECT methods measure PRESSURE and
INDIRECT methods measure FLOW. In addition,
differences occur because the location of
measurement used is generally not identical in both
methods, i.e., brachial artery for NBP vs. radial
artery for invasive pressure monitoring.
Problem:
Why is the monitor alarming DISCONNECTED?
Answer:
The arterial disconnect alarm found in the ART or FEM
menu is on. If the mean pressure falls below 25 mmHg
and the disconnect alarm is on, a warning alarm sounds
and the message “DISCONNECTED” is displayed in the
parameter window. When zeroing the line, the clinician
has 14 seconds to complete the process. After that time
period, the message and alarm will be activated.
Intervention:
■ If zeroing, close the stopcock. Once the monitor
detects the return of waveform and numeric data,
the alarm will reset.
■ Check the patient immediately in the event the
catheter has been dislodged.
■ The DISCONNECT ALARM may be turned off in
the arterial menu. Remember to monitor the patient
closely when turning this alarm off.
TROUBLESHOOTING and
FREQUENTLY ASKED QUESTIONS
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