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Related Concept Videos

Electrocardiogram01:29

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...
Decreased Body Temperature01:29

Decreased Body Temperature

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 sustained extreme cold exposure, and severe...
Cardiac Action Potential01:30

Cardiac Action Potential

Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...

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Related Experiment Video

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In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model
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Electrocardiographic changes during therapeutic hypothermia.

Pia Lebiedz1, Jan Meiners, Alexander Samol

  • 1Department of Cardiology and Angiology, University Hospital of Muenster, Muenster, Germany. pia.lebiedz@ukmuenster.de

Resuscitation
|November 29, 2011
PubMed
Summary

Mild therapeutic hypothermia (MTH) effectively treats cardiac arrest survivors, showing significant ECG changes like decreased heart rate and prolonged intervals. Despite these changes, MTH can be safely applied with careful monitoring, posing no increased arrhythmia risk.

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Area of Science:

  • Cardiology
  • Critical Care Medicine
  • Emergency Medicine

Background:

  • Mild therapeutic hypothermia (MTH) is a proven treatment for improving outcomes in patients resuscitated from out-of-hospital cardiac arrest.
  • While generally safe, MTH has been associated with potential adverse events, including arrhythmias and bleeding complications.
  • Limited data exists on specific electrocardiographic (ECG) changes and their clinical significance during MTH.

Purpose of the Study:

  • To analyze electrocardiographic changes and associated complications in patients undergoing induced mild therapeutic hypothermia after out-of-hospital cardiac arrest.
  • To evaluate the safety and efficacy of MTH by monitoring heart rate, PR intervals, QTc intervals, and complication rates.

Main Methods:

  • An observational, single-center study included 109 comatose survivors of out-of-hospital cardiac arrest treated with MTH between June 2005 and March 2011.
  • Preclinical course, ECG parameters, arrhythmias, laboratory values, and complication rates were analyzed before, during, and after MTH.
  • Specific attention was given to changes in heart rate, PR, and QTc intervals, as well as bleeding complications and the impact of thrombolysis and PCI.

Main Results:

  • MTH significantly decreased heart rate and prolonged PR and QTc intervals (p<0.01).
  • Two patients developed ventricular fibrillation, both associated with acute myocardial infarction; no significant MTH-related electrolyte or coagulation changes were observed.
  • Major bleeding complications occurred in 3.7% of patients, with a trend towards more bleeding after preclinical thrombolysis (p=0.057), but no increased risk with double platelet inhibition after PCI.

Conclusions:

  • Induced mild therapeutic hypothermia can be safely administered to most out-of-hospital cardiac arrest survivors under strict clinical and laboratory monitoring.
  • Significant electrocardiographic changes, including heart rate reduction and interval prolongation, occur during MTH but do not appear to increase arrhythmia risk.
  • MTH is a valuable therapeutic option when applied cautiously, with careful consideration of potential bleeding risks, especially following thrombolysis.