Invivo Magnitude 3150M, Operation Manual

Page: 11 / 80

vii
PRECAUTIONS (Continued)
ECG (Continued)
B
o
(static) magnetic field artifact can present artificially-induced augmented T waves during ECG
monitoring. Due to the effects of the magnetic field on the moving blood of the patient, follow the
recommended ECG Electrode Placement to minimize this type of artifact.
An inoperative ECG monitor is indicated by absence of an ECG waveform and a simultaneous Lead
Fail alarm.
Heart rate values may be adversely affected by cardiac arrhythmia, or by operation of electrical
stimulators.
Pressures
For best invasive pressure monitoring, always select the appropriate waveform scale for the
waveform being observed.
For invasive pressure monitoring, routinely inspect the catheter and/or pressure line for leaks after
zeroing. Always follow the pressure transducer/catheter manufacturer’s use recommendations.
Never place the pressure transducer(s) within the MRI bore. Transducer failure or noisy MRI images
can result.
Invasive blood pressure transducers are sensitive to vibrations that can occur during MRI scanning,
which can lead to pressure reading inaccuracies. Always mount the invasive blood pressure
transducer away from areas where vibration is likely to occur.
Always zero the pressure transducer(s) prior to patient use.
Non-physiological pulsatile invasive pressure waveforms (e.g., such as found during intra-aortic
balloon pump use) can lead to inaccurate blood pressure readings. If questionable values are
observed, re-check patient’s pressures by alternate means before administering medication or
therapy.
Air that may be trapped within the pressure transducer or its associated tubing should be removed
by flushing the system following established hospital or catheter lab procedures.
The fluid within the pressure transducer system is a conductive connection to the patient, and should
not contact other conductive parts, including earth ground.
NIBP
Use only MRI Compatible NIBP Accessories (See MRI Accessory list in this Section).
When using the NIBP portion of this instrument to measure blood pressure, remember that the
patient’s blood pressure readings are not continuous, but are updated each time a blood pressure
measurement is taken. Set a shorter interval for more frequent updating of the patient’s blood
pressure.
Do not attach the cuff to a limb being used for infusion. Cuff inflation can block infusion, possibly
causing harm to the patient.
Frequent NIBP measurements can cause pooling of the blood in the limb (hemostasis), and
peripheral tissue/nerve damage. Allow sufficient time for blood recirculation to prevent pooling of
the blood in the limb.
Arrhythmic and/or erratic heart beats (or severe motion artifact, such as tremors or convulsions) can
result in inaccurate readings and/or prolonged measurements. If questionable readings are obtained,
re-check patient’s vital signs by alternate means before administering medication.