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Updated: Aug 16, 2026

Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
Published on: October 22, 2014
[Development and clinical evaluation of a new electronic device for measuring arterial pressure. Sphygmodigital 4000]
Abstract:
Sphygmodigital 4000 is a new automatic electronic device for measurement of the blood pressure (BP). The authors have tested it in their clinic for 6 months and compared the BP values obtained with those measured by the auscultatory method and intraarterially. The differences between the Sphygmodigital 4000 values and those measured by auscultation were -3.7 mm Hg for systolic BP (this error could be eliminated) and +0.2 mm Hg for diastolic BP. The results of comparison with intraarterially measured BPs were -1 mm Hg for systolic BP and +1 mm Hg for diastolic BP. This device is precise and also allows recording of beats.
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Related Concept Videos
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)
Assessing Blood pressure using a doppler ultrasound
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
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.