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Related Concept Videos

Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

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Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac...
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Rapidly Varying Flow01:24

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
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Measurement of Blood Pressure01:17

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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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Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface
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Quantifying rapid changes in cardiovascular state with a moving ensemble average.

Matthew Cieslak1, William S Ryan1, Viktoriya Babenko1

  • 1Department of Psychological and Brain Sciences, University of California Santa Barbara, Santa Barbara, California, USA.

Psychophysiology
|October 4, 2017
PubMed
Summary
This summary is machine-generated.

MEAP is an open-source tool for analyzing cardiovascular data like ECG and BP. Its moving ensemble method continuously estimates cardiovascular state, capturing rapid changes during physiological tasks.

Keywords:
analysis/statistical methodsautonomiccardiovascularfMRIheart rateimpedance cardiography

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Area of Science:

  • Biomedical Engineering
  • Cardiovascular Physiology
  • Signal Processing

Background:

  • Multisubject analysis of cardiovascular data (ECG, ICG, BP) requires advanced tools.
  • Traditional ensemble averaging has limitations in capturing dynamic cardiovascular changes.

Purpose of the Study:

  • Introduce MEAP, a novel open-source pipeline for cardiovascular data analysis.
  • Develop and validate a moving ensemble averaging method for continuous cardiovascular index estimation.
  • Demonstrate MEAP's utility in capturing dynamic cardiovascular responses during physiological challenges.

Main Methods:

  • Developed the Moving Ensemble Analysis Pipeline (MEAP) with a novel moving ensemble averaging technique.
  • Implemented signal processing, artifact correction, and cardiovascular-based fMRI analysis features.
  • Validated the B point detection algorithm and assessed MEAP's performance during physical and cognitive tasks.

Main Results:

  • MEAP reliably estimates cardiovascular indices (cardiac output, heart rate variability, etc.) continuously.
  • The moving ensemble method accurately captures rapid cardiovascular changes during the Valsalva maneuver and cold pressor response.
  • Individual cardiovascular measures showed significant variability within cognitive tasks, indicating potential for event-related analysis.

Conclusions:

  • MEAP provides a robust platform for multisubject cardiovascular data analysis.
  • The moving ensemble technique offers superior temporal resolution for cardiovascular monitoring compared to fixed-window methods.
  • MEAP facilitates the study of dynamic cardiovascular changes and their relationship to cognitive and physical states.