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Related Concept Videos

Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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Direct Method
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...
1.1K
Special considerations while measuring blood pressure01:28

Special considerations while measuring blood pressure

779
When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
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.
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Measurement of Blood Pressure01:17

Measurement of Blood Pressure

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Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...
1.0K
Sites for measruring blood pressure01:21

Sites for measruring blood pressure

1.9K
Blood pressure measurement is a fundamental clinical procedure, providing crucial data for assessing cardiovascular health. Among the various sites for this measurement, the brachial and popliteal arteries are predominantly utilized due to their accessibility and the reliability of their readings. This lesson delves into the anatomical significance, methodology, and considerations of measuring blood pressure at these locations.
The Brachial Artery: Primary Site for Blood Pressure Measurement
1.9K
Assessment of blood pressure in brachial artery(two-step method)01:23

Assessment of blood pressure in brachial artery(two-step method)

789
Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
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Assessment of blood pressure in brachial artery(one-step method)01:15

Assessment of blood pressure in brachial artery(one-step method)

653
This procedural guide systematically measures blood pressure using an oscillometric digital sphygmomanometer, emphasizing accuracy, patient safety, and comfort.
Prepare for the Procedure:
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Related Experiment Video

Updated: Jul 29, 2025

Assessing the Accuracy of Fitness Smartwatch Data for Cardiovascular and Physical Activity Monitoring: A Validation Study in Digital Health
05:51

Assessing the Accuracy of Fitness Smartwatch Data for Cardiovascular and Physical Activity Monitoring: A Validation Study in Digital Health

Published on: February 21, 2025

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Cuffless Blood Pressure Measurement Using Smartwatches: A Large-Scale Validation Study.

Zeng-Ding Liu, Ye Li, Yuan-Ting Zhang

    IEEE Journal of Biomedical and Health Informatics
    |May 19, 2023
    PubMed
    Summary
    This summary is machine-generated.

    Smartwatch blood pressure (BP) monitoring shows promise, accurately measuring diastolic BP for all and systolic BP for some individuals with calibration. However, accuracy decreases in diverse, older, or hypertensive populations, limiting cuffless BP measurement utility.

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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Technology
    • Digital Health

    Background:

    • Cuffless blood pressure (BP) monitoring using wearable devices is an emerging field.
    • Accurate BP measurement is crucial for managing hypertension and cardiovascular health.
    • Existing cuffless BP techniques require validation in large, diverse populations.

    Purpose of the Study:

    • To evaluate the performance of smartwatch-based cuffless BP measurement techniques.
    • To compare calibration-based and calibration-free strategies using traditional machine learning (TML) and deep learning (DL) models.
    • To assess the accuracy of these techniques across various demographic and health subgroups.

    Main Methods:

    • 3077 participants (aged 18-75) were enrolled for approximately one month.
    • Simultaneous recording of electrocardiogram, pulse pressure wave, and multiwavelength photoplethysmogram signals via smartwatches.
    • Reference BP measurements obtained via dual-observer auscultation; TML and DL models were developed and evaluated.

    Main Results:

    • The best calibration-based model achieved estimation errors of 2.31 ± 9.57 mmHg for SBP and 1.33 ± 6.43 mmHg for DBP in the overall population.
    • Reduced SBP errors were observed in normotensive (1.97 ± 7.85 mmHg) and younger (0.24 ± 6.61 mmHg) participants.
    • The best calibration-free model showed errors of -0.71 ± 13.04 mmHg for SBP and -0.29 ± 8.78 mmHg for DBP.

    Conclusions:

    • Smartwatches can effectively measure DBP for all and SBP for normotensive/younger individuals with calibration.
    • Performance significantly degrades in heterogeneous populations (older, hypertensive individuals).
    • Cuffless BP measurement without calibration has limited routine application; further research is needed for diverse populations.