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Non-invasive oscillometric wrist and upper arm blood pressure measurements compared with invasive values
1Dept. of Medicine, Städt. Kliniken Dortmund, Germany.
Abstract:
In 100 patients invasive blood pressure (BP) measurements in the aortic arch were compared with oscillometric devices at the left upper arm (UA1, device: Hestia OZ 80) and at the left and right wrists (Wl, Wr, device: NAiS Blood Pressure Watch). BPs/BPd at Wl were on average 4.3/6.0 mmHg higher than aortic BP with a relative high variability. Difference between Wls and Aos more than +/- 20 mmHg in 16% of patients between Wld and Aod more than +/- 20 mmHg in 5% of patients. Within the limits of +/- 10 mmHg, we found 56% of the systolic and 74% of the diastolic wrist values compared to the aorta. The automatic oscillometric BP measurement at the wrist is a useful method for BP self-measurement, but should be compared with upper arm values before recommending it (difference < +/- 10 mmHg) in the individual case.
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Sites for measuring blood pressure
The Brachial Artery: Primary Site for Blood Pressure Measurement
Equipments Used To Measure Blood Pressure
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...
Assessment of blood pressure in brachial artery(one-step method)
Prepare for the Procedure:
Assessment of blood pressure in brachial artery(two-step method)
Special considerations while measuring blood pressure
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
Pre-Procedural Guidelines for Assessing Blood Pressure