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Effect of Transducer Position on Intra-Arterial Blood Pressure Monitoring Among Patients Who Underwent Cardiac
Margaret Kath1,2, Lakshmi Ramamoorthy1,2, Ram Sankar P1,2
1Author Affiliations: College of Nursing, JIPMER, Puducherry, India (Ms Kath, Dr Ramamoorthy, Ms Lalthanthuami); Department of Cardiothoracic and Vascular Surgery, JIPMER, Puducherry, India (Drs Ram Sankar and Rath).
Abstract:
Invasive blood pressure (IBP) monitoring is essential for caring for critically ill patients. The pressure transducer should be placed at the phlebostatic axis to provide accurate and reliable readings. A prospective observational study was conducted with 50 participants using consecutive sampling. Adult patients on IBP monitoring admitted to the intensive care unit after cardiac surgery, who were hemodynamically stable, were included. Arterial blood pressure and central venous pressure measurements were taken at different transducer positions, including the IV stand, bedside, and upper arm, which were leveled at the phlebostatic axis (PA) and ±5 cm from PA. The study found a statistically significant difference in systolic, diastolic, and mean arterial blood pressure measured at the PA and ±5 cm of the phlebostatic (PB) axis (P < .001), as well as at various transducer positions, including the IV stand, taped to bedside, and taped to the upper arm (P = .052, P < .001, P < .001). At all positions at the PB axis, taping at the bedside placement generally results in higher readings. Routine placement of the transducer at the bedside should be avoided, and it is essential to position the transducer with the IV/Transducer stand, or the patient's upper arm approximated at the PA.
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This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...