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Similarity between blood pressure values assessed by auscultatory method with mercury sphygmomanometer and automated
Maria Valéria Pavan1, Glauco Eduardo Saura, Henri Augusto Korkes
1Unidade de Hipertensão e Diabetes, Hospital Santa Lucinda, Pontifícia Universidade Católica de São Paulo, SP.
Introduction:
One of the biggest challenges in the management of hypertension is adequate blood pressure (BP) control. To achieve this goal, home blood pressure measurement (HBPM) with automated devices has been encouraged. However, part of the medical community still disputes its validity, believing that HBPM may lead to incorrect readings.
Objective:
To evaluate the correspondence between the simultaneous measurements of BP with the auscultatory method and an oscillometric digital method, commonly used in HBPM.
Methods:
BP was determined simultaneously in 423 individuals (normotensive and hypertensive) with a validated automated digital device (ONROM 705IT) and with the auscultatory method with a mercury sphygmomanometer. Both devices were connected through a Y-shaped connection to a cuff whose size was adjusted to the arm circumference.
Results:
The values represent mean ± SD (minimum-maximum values): age 40.8 ± 16.3 years (18-92), arm circumference 28.2 ± 3.7 cm (19-42), systolic BP (SBP) auscultatory 127.6 ± 22.8 mmHg (69-223), SBP automated 129.5 ± 23.0 mmHg (56-226), diastolic BP (DBP) auscultatory 79.5 ± 12.6 mmHg (49-135) DBP automated 79.0 ± 12.6 mmHg (48-123). The mean difference in SBP between the two methods was 1.9 mmHg (-15 to +19) and 0.5 mmHg for DBP (-19 to +13). The Bland-Altman analysis showed clinically acceptable agreement between the methods.
Conclusion:
BP measured with the automated method closely mirrors that determined with the conventional auscultatory method and should be used to improve the diagnosis and control of hypertension.
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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...
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.
Assessment of blood pressure in brachial artery(one-step method)
Prepare for the Procedure:
Assessment of blood pressure in brachial artery(two-step method)
Sites for measuring blood pressure
The Brachial Artery: Primary Site for Blood Pressure Measurement
Measurement of Blood Pressure

