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Published on: February 7, 2015
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Arterial Monitoring System Leveling Method, Transducer Location, and Accuracy of Blood Pressure Measurements
Maryanne Crowther1, Jennifer Ricker2, Lisa Frank3
1Maryanne Crowther is a critical care advanced practice nurse, St Joseph's University Medical Center, Paterson, New Jersey.
Summary
Transducer location and visual alignment generally do not affect arterial blood pressure monitoring accuracy. Diastolic blood pressure may differ with leveling methods, suggesting visual alignment is acceptable for most clinical practice.
Area of Science:
- Critical care medicine
- Cardiovascular monitoring
Background:
- Invasive arterial catheters are crucial for monitoring blood pressure in critically ill patients.
- The impact of catheter leveling methods and transducer placement on measurement accuracy remains unclear.
Purpose of the Study:
- To assess if alternative transducer locations and visual alignment versus laser leveling impact blood pressure measurement accuracy.
- To evaluate the clinical utility of different transducer placements and leveling techniques.
Main Methods:
- 36 participants were randomized into three groups based on transducer location (upper arm, arm with cloth, wrist).
- Each participant served as their own control with the transducer on the intravenous pole.
- Blood pressure was measured using visual alignment and laser leveling for both experimental and control conditions.
Main Results:
- No significant differences in blood pressure readings were found based on transducer location.
- Diastolic blood pressure showed a significant difference between leveling methods (P = .01).
- Age, Simplified Acute Physiology Score II, and duration of mechanical ventilation were associated with blood pressure readings.
Conclusions:
- Evaluated transducer locations are potentially useful in clinical settings.
- Visual alignment may be acceptable for blood pressure monitoring, with a caveat for diastolic blood pressure in the control location.
- Further research is recommended to validate these findings on blood pressure monitoring accuracy.
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