Welch Allyn Spot Vital Signs LXi - User Manual - Manual (Page 57)

Directions for Use Troubleshooting 47
Event Causes and Corrective Actions
Note Differences of up to 10 mmHg between manual and automatic readings are
considered normal and occur for a number of reasons including intra-patient BP
variability, observer hearing differences, and auscultatory deflation rate.
Table 16. Inaccurate Blood Pressure Readings
Possible Cause Corrective Action and Explanation
Incorrect cuff size Use Welch Allyn approved cuffs only.
Measure patient’s arm circumference midway between elbow and
shoulder (see “Blood Pressure Cuff Selection” on page 33 to select correct
cuff size). Use reference markings on cuff to ensure correct cuff size.
Patient’s arm position Ensure patient’s arm is at heart level.
Arm movement during blood pressure
cycle Keep arm still during blood pressure cycle.
•
Movement may cause inaccuracies from artifact.
Blood pressure taken over clothing Take blood pressure on a bare arm.
Arrhythmia Check for regularity of heart rate (palpate pulse or check device).
•
Moderate to severe heart rate irregularities may make blood pressure
difficult to measure accurately.
Change in blood pressure between
auscultatory reading and Spot LXi reading Check blood pressure immediately before Spot LXi reading.
•
Blood pressure is dynamic and changing. It is normal for blood
pressure to fluctuate 5 to 10 mmHg.
Incorrect reference Use the correct Korotkoff sound to determine diastolic blood pressure.
•
Many listeners incorrectly equate diastolic blood pressure with the
disappearance of sound only (phase 5). Spot LXi was developed using
the American Heart Association recommendations, which state that
phase 5 be used unless sound continues to 0 mmHg, in which case the
change in the quality of sound (phase 4) is to be used.
Deflate cuff no faster than 3 mmHg per second.
•
One of the major sources of error in auscultatory blood pressure
measurement is deflating the cuff too quickly. The American Heart
Association recommends deflation no faster than 3 mmHg per second.
Only use a sphygmomanometer that is calibrated.
•
An uncalibrated sphygmomanometer may result in inaccurate blood
pressure measurements.
Poor auscultatory sound recognition by
observer Use high-quality stethoscope. Have a different observer check patient’s
blood pressure.
Table 17. Cuff Inflation and Deflation with No Blood Pressure Reading Displayed (or Error Code in
Display)
Possible Cause Corrective Action and Explanation
Leak in pneumatic system Ensure all cuff attachments are tight.
Carefully check for leaks in the blood pressure cuff, tubing, and pressure
hose attached to Spot LXi.
Arm movement during cycle Keep arm still during blood pressure cycle.
•
Movement may cause inaccuracies from artifact, long cycle times, and
error message.
Cuff tubing or pressure hose movement
artifact Do not contact cuff tubing or pressure hose during blood pressure cycle.
•
Movement may cause inaccuracies from artifact.