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Published on: May 15, 2009
Blood pressure measurement: an evaluation of direct and indirect methods
Abstract:
In order to evaluate the differences between the blood pressure values obtained by direct intraarterial (DM) and indirect sphygmomanometer (IM) measurements, both systems were employed in 30 patients during their immediate postoperative period (24 hours) at our Intensive Care Unite after open heart surgery. The total number of determinations was 355. The statistical study of data lead us to the following conclusions: 1. There are significant differences between arterial pressure values obtained by DM and IM falling within an acceptable range of error for clinical purposes 2. Both methods of measurement, direct and indirect, are highly influenced by technical details that have to be carefully standardised if suitable research values are to be obtained.
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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.
Measurement of Blood Pressure

