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Related Concept Videos

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...
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Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
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Pulse01:05

Pulse

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The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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Blood Pressure01:24

Blood Pressure

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The movement of blood in a human body, commonly referred to as blood flow, is determined by the volume of blood that traverses a certain section of the bodily system per unit time. It is the rhythmic contraction of the heart's ventricles that primarily instigates this movement. As the ventricles contract, blood is forced into the prominent arteries, which then flow from areas of greater pressure to lower pressure areas. This movement continues into smaller arteries and arterioles and...
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Sites for measruring blood pressure01:21

Sites for measruring blood pressure

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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
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Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
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Relationship Between Pulse Transit Time, PPG Features, and Blood Pressure in Atrial Fibrillation.

Zeng-Ding Liu, Wei-Xiu Qiu, Zi-Xuan Huang

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 3, 2025
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    This study shows that specific pulse transit time and photoplethysmogram features can track blood pressure (BP) fluctuations in atrial fibrillation (AF) patients. These findings are crucial for developing accurate cuffless BP monitoring devices for individuals with AF.

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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Research
    • Medical Signal Processing

    Background:

    • Atrial fibrillation (AF) increases cardiovascular risk, necessitating continuous blood pressure (BP) monitoring.
    • Existing cuffless BP estimation methods often fail in AF due to their design for sinus rhythm (SR).

    Purpose of the Study:

    • To investigate the relationship between pulse transit time (PTT), photoplethysmogram (PPG) features, and BP in AF patients.
    • To develop and evaluate BP estimation models for AF using these physiological signals.

    Main Methods:

    • Collected synchronized ECG, PPG, and invasive BP signals from 43 patients during ablation procedures.
    • Analyzed beat-to-beat variations in PTT, PPG features, and BP.
    • Developed individualized ridge regression models for BP estimation.

    Main Results:

    • AF patients exhibited significantly higher beat-to-beat variability in BP, PTT, and PPG features compared to SR patients.
    • Descending time and area strongly correlated with diastolic BP; PTT and pulse intensity ratio correlated with systolic BP in AF.
    • Ridge regression models showed improved tracking of dynamic BP trends in AF (r=0.748 SBP, r=0.734 DBP).

    Conclusions:

    • Specific PTT and PPG features are effective markers for BP fluctuations in AF.
    • Cuffless BP monitoring models tailored for AF can better capture dynamic BP changes than those for SR.
    • This research provides insights for developing advanced cuffless BP monitoring solutions for AF populations.