B40/B20 Patient Monitor10-14Advanced InvBP troubleshootingAdvanced temperature troubleshootingSymptom Possible cause and solutionInvBP readings seemunstable• Make sure there are no air bubbles in the transducer system. Flush andzero.• Place the transducer on the patient’s mid-heart level and zero.Why are displayedpressure values differentthan expected?• Check the patient. Values could be valid, the patient could be lying on thetubing, or the tubing could be kinked.• Check tubing for bubbles.• Remove excess tubing.• Check phlebostatic axis placement of transducer.• Rezero pressure.• Is patient on IABP? If so, verify that the monitor’s IABP program is turnedon. If necessary, turn it on.Why are the arterial,non-invasive(oscillometric), andauscultated bloodpressure readingsindicating differentvalues?The three measurement methods use different technologies. Auscultation andoscillometric are both indirect methods of measuring blood pressure. Inauscultation, changes in arterial sounds during cuff deflation are related tosystolic and diastolic pressure. With oscillometric measurement, changes inmeasured pressure oscillations during cuff deflation are related to systolic,mean and diastolic pressures. Changes in the vascular tone of the arterialsystem can cause these two indirect methods to differ from one another andfrom direct arterial pressure measurements.Invasive arterial blood pressure is a direct method of measuring bloodpressure. Differences between direct and indirect blood pressuremeasurements are expected. These differences occur because direct methodsmeasure pressure and indirect methods measure flow. In addition, differencesoccur because the measurement location is not the same (e.g., brachial arteryfor NIBP vs. radial artery for invasive arterial pressure monitoring).Why is the monitoralarming arterialdisconnect?• Check the patient immediately in the event the catheter has beendislodged.• If the arterial disconnect alarm is turned on and the mean pressure fallsbelow 25 mmHg, the monitor alarms. When zeroing the pressure line, theclinician has 14 seconds to complete the process. After that time thedisconnect alarm is activated.• If zeroing, close the stopcock. Once the monitor detects the return ofwaveform and numeric data, the alarm will reset.Symptom Possible cause and solutionTemperaturemeasurement fails• Check that you are using a correct probe.• Try another probe.
