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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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Alterations in Blood Pressure01:30

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Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart...
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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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Special considerations while measuring blood pressure01:28

Special considerations while measuring blood pressure

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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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Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
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Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation01:21

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Clinical manifestationsPeripheral Arterial Disease (PAD) manifests through a range of symptoms, from the characteristic intermittent claudication to atypical presentations and severe complications in advanced stages. Intermittent claudication, a hallmark symptom of PAD, presents as exercise-induced muscle pain that typically resolves within minutes of rest. This pain is reproducible and stems from inadequate blood flow, leading to the accumulation of lactic acid produced during anaerobic...
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Related Experiment Video

Updated: Aug 29, 2025

Multi-Modal Home Sleep Monitoring in Older Adults
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Classifying nocturnal blood pressure patterns using photoplethysmogram features.

Eoin Finnegan, Shaun Davidson, Mirae Harford

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |September 10, 2022
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    Summary
    This summary is machine-generated.

    Photoplethysmogram (PPG) features show circadian rhythms, offering a non-disruptive way to assess blood pressure (BP) patterns. This could improve cardiovascular event risk assessment without sleep disturbance.

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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Physiology
    • Medical Informatics

    Background:

    • Circadian rhythms in blood pressure (BP) are linked to cardiovascular event risk.
    • Current BP monitoring methods can disrupt sleep and daily activities.
    • Photoplethysmogram (PPG) signals offer a non-invasive, unobtrusive alternative for BP assessment.

    Purpose of the Study:

    • To investigate circadian rhythms in PPG features.
    • To evaluate PPG features for classifying nocturnal BP patterns.
    • To assess the potential of PPG as a surrogate for BP rhythm monitoring.

    Main Methods:

    • Analysis of 742 patients from the MIMIC-III database.
    • Evaluation of 19 PPG features for circadian rhythm detection.
    • Comparison of PPG feature circadian rhythms with heart rate (HR) and systolic blood pressure (SBP) rhythms.

    Main Results:

    • Several PPG features demonstrated clear circadian rhythms.
    • Five PPG features showed stronger correlation with SBP circadian rhythms than HR.
    • A combined metric of PPG features significantly improved BP phenotype classification accuracy.

    Conclusions:

    • PPG features exhibit robust circadian rhythms.
    • PPG-derived metrics show promise for assessing individual circadian BP patterns.
    • This approach may offer a non-disruptive method for cardiovascular risk assessment.