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Related Concept Videos

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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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Decreased Body Temperature01:29

Decreased Body Temperature

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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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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...
523
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

877
Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model
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In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model

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[Hypothermia-induced ECG changes: characteristic, but not specific].

G Michels1, S Ney2, F Hoffmann2

  • 1Klinik III für Innere Medizin, Herzzentrum der Universität zu Köln, Kerpener Str. 62, 50937 Köln, Köln, Deutschland. guido.michels@uk-koeln.de.

Medizinische Klinik, Intensivmedizin Und Notfallmedizin
|November 16, 2017
PubMed
Summary
This summary is machine-generated.

Hypothermia can cause J-waves, also known as Osborn waves, in 20-40% of patients undergoing therapeutic hypothermia after cardiac arrest. While characteristic, these waves require cautious electrocardiographic interpretation due to other hypothermia effects.

Keywords:
ArrhythmiaCardiopulmonary resuscitationHypothermiaJ-wave syndromeVentricular fibrillation

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Area of Science:

  • Cardiology
  • Critical Care Medicine
  • Electrophysiology

Background:

  • Hypothermia is frequently used in targeted temperature management after cardiopulmonary resuscitation.
  • Electrocardiographic (ECG) changes are common during hypothermia.
  • J-waves, or Osborn waves, are a notable ECG finding associated with hypothermia.

Purpose of the Study:

  • To describe the occurrence and significance of J-waves during therapeutic hypothermia.
  • To highlight the diagnostic challenges posed by J-waves in post-cardiac arrest care.

Main Methods:

  • Observational analysis of ECGs from patients undergoing therapeutic hypothermia.
  • Correlation of J-wave presence with hypothermia depth and duration.
  • Review of literature on ECG changes during hypothermia.

Main Results:

  • J-waves were detected in 20-40% of patients treated with therapeutic hypothermia.
  • The presence of J-waves is characteristic but not exclusively indicative of hypothermia.
  • Hypothermia causes various electromechanical changes in the myocardium that can affect ECG interpretation.

Conclusions:

  • J-waves are a common finding in therapeutic hypothermia post-cardiac arrest.
  • ECG interpretation during hypothermia requires careful consideration of all associated cardiac changes.
  • Caution is advised when diagnosing based solely on J-waves in hypothermic patients.