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Pulse rhythm

Pulse rhythm

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 muscle...

Correlation between ECG and Cardiac Cycle

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...

ECG Interpretation of Rhythms

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An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
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Electrocardiogram

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...

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An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
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Related Experiment Video

Updated: May 31, 2026

Semi-automated Optical Heartbeat Analysis of Small Hearts

Semi-automated Optical Heartbeat Analysis of Small Hearts

Published on: September 16, 2009

Statistical coding and decoding of heartbeat intervals.

Fausto Lucena¹, Allan Kardec Barros, José C Príncipe

¹Biological Information Engineering Laboratory, Nagoya University, Nagoya, Aichi, Japan. lucena@ohnishi.nagoya-u.ac.jp

|June 23, 2011

Summary

The heart uses information theory principles to regulate cardiac rhythm, minimizing statistical redundancy to adapt to changing demands. This mechanism mirrors how sensory systems process information for survival.

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Area of Science:

Cardiovascular Physiology
Computational Neuroscience
Information Theory

Background:

The heart's autonomic nervous system (ANS) regulation involves integrating neuroregulatory signals into frequency bands.
Organisms adapt to environmental changes by extracting essential features, but neural circuitry's self-organization for this remains unclear.
Computational perception models suggest neural populations enhance survival-relevant information by minimizing stimulus redundancy.

Purpose of the Study:

To investigate if the cardiac system employs a redundancy reduction strategy for cardiac rhythm regulation.
To understand how neural circuitry self-organizes feature detectors for behaviorally relevant information.
To explore information theory principles in cardiac autonomic regulation.

Main Methods:

Developed a network of neural filters optimized for coding heartbeat intervals.
Learned a population code maximizing information across the neural ensemble.
Analyzed filter tuning properties and compared responses to direct nerve stimulation.

Main Results:

The emergent population code exhibited filter tuning properties explaining autonomic cardiac regulation aspects, including the balance between fast and slow responses.
Model responses quantitatively matched observed heart rate changes during sympathetic and parasympathetic nerve stimulation.
The cardiac system appears to decode autonomic stimuli using information theory principles.

Conclusions:

The heart utilizes a redundancy reduction strategy, akin to sensory systems, to regulate cardiac rhythm.
This adaptive mechanism optimizes cardiac demand regulation and response to environmental unpredictability.
Findings suggest a unified information processing principle across physiological and perceptual systems.