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Related Concept Videos

Dysrhythmias II: Classification of Tachyarrhythmias01:28

Dysrhythmias II: Classification of Tachyarrhythmias

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Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...
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Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...
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Electrocardiogram01:29

Electrocardiogram

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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...
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Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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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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Related Experiment Video

Updated: Mar 27, 2026

Dual-Dye Optical Mapping of Hearts from RyR2R2474S Knock-In Mice of Catecholaminergic Polymorphic Ventricular Tachycardia
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Method for classifying cardiac arrhythmias using photoplethysmography.

Luisa F Polania, Lalit K Mestha, David T Huang

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 7, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Wearable photoplethysmography (PPG) offers a low-cost, noninvasive method for detecting cardiac arrhythmias like ventricular premature contractions (VPCs) and ventricular tachycardia (VT). This technology shows promise for ambulatory monitoring and early intervention in heart disease patients.

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    Area of Science:

    • Biomedical Engineering
    • Cardiology
    • Wearable Technology

    Background:

    • Wearable technologies are advancing clinical applications, driven by mobile computing and miniature devices.
    • Photoplethysmography (PPG) is ideal for wearable sensing due to its low cost, noninvasive nature, and lack of wet electrodes.
    • PPG signals contain vital information on pulsating blood variations linked to cardiac electrical activity.

    Purpose of the Study:

    • To investigate the potential of ambulatory photoplethysmography (PPG) monitoring for arrhythmia detection and classification.
    • To develop and present a method for classifying ventricular premature contraction (VPC) and ventricular tachycardia (VT) against normal sinus rhythm (NSR) and supraventricular premature contraction (SVPC).

    Main Methods:

    • Utilized photoplethysmography (PPG) signals recorded from patients undergoing arrhythmia ablation therapy.
    • Developed a classification method to distinguish between NSR, SVPC, VPC, and VT based on PPG data.
    • Focused on ambulatory monitoring capabilities of PPG.

    Main Results:

    • The study presents a method for classifying specific cardiac arrhythmias using PPG signals.
    • Demonstrated the potential of PPG for differentiating between normal rhythms and concerning arrhythmias like VPCs and VT.

    Conclusions:

    • Ambulatory PPG monitoring can be effectively employed for the detection and classification of cardiac arrhythmias.
    • Accurate measurement of VPC frequency and early VT detection are crucial for managing cardiac disease and preventing adverse events like sudden cardiac death.