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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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.
Cardiopulmonary Resuscitation III: AED Use01:23

Cardiopulmonary Resuscitation III: AED Use

Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
Introduction Cardiac Emergencies01:30

Introduction Cardiac Emergencies

Cardiac emergencies are critical situations involving the heart that require immediate medical intervention to prevent severe complications or death. These emergencies often arise from underlying heart conditions that impair the heart's ability to function correctly.Types of Cardiac EmergenciesThe most common types of cardiac emergencies include Acute Coronary Syndrome (ACS), myocardial infarction (MI), cardiac arrest, and heart failure.Acute Coronary Syndrome (ACS)Acute Coronary Syndrome (ACS)...
Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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...
Cardiopulmonary Resuscitation IV: Pharmacological Management01:25

Cardiopulmonary Resuscitation IV: Pharmacological Management

Pharmacologic intervention is crucial in treating cardiac arrest patients during ACLS or Advanced Cardiovascular Life Support. The ACLS algorithms guide the administration of specific drugs based on the patient's cardiac arrest rhythm, which includes pulseless ventricular tachycardia (VT), ventricular fibrillation (VF), asystole, and pulseless electrical activity (PEA).EpinephrineIndication: Epinephrine is the first-line drug for all cardiac arrest rhythms.Mechanism of Action: Epinephrine...
Pulse rhythm01:30

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...

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Association Between Geomagnetic Activity and Unsuccessful Out-of-Hospital Cardiac Arrest.

Jone Vencloviene1,2, Asta Krikscionaitiene3, Linas Darginavicius3

  • 1Institute of Cardiology Lithuanian University of Health Sciences Kaunas Lithuania.

Geohealth
|June 25, 2026
PubMed
Summary

Geomagnetic activity may impact out-of-hospital cardiac arrest (OHCA) survival. Lower return of spontaneous circulation (ROSC) occurred during geomagnetic storms, especially without a shockable rhythm, but higher activity improved ROSC with a shockable rhythm.

Keywords:
Kp indicesemergency medical servicesgeomagnetic activitygeomagnetic stormsout‐of‐hospital cardiac arrestresuscitation

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Area of Science:

  • Cardiology
  • Environmental Health
  • Emergency Medicine

Background:

  • Out-of-hospital cardiac arrest (OHCA) has a low survival rate (<10%).
  • Geomagnetic activity (GMA) is known to disrupt circadian rhythms.
  • Potential impact of GMA on OHCA patient outcomes requires investigation.

Purpose of the Study:

  • To analyze the association between geomagnetic activity (GMA) and the risk of absence of return of spontaneous circulation (ROSC) in OHCA patients.
  • To investigate the modifying role of shockable rhythm (SHR) on this association.
  • To adjust for potential confounders in the analysis.

Main Methods:

  • Retrospective analysis of 1,507 Emergency Medical Services (EMS) patient records from Kaunas, Lithuania (2016-2021).
  • Multivariate logistic regression to assess the relationship between GMA and absence of ROSC.
  • Analysis stratified by shockable rhythm (SHR) status and geomagnetic storm (GS) periods.

Main Results:

  • Lower ROSC rates were observed in patients without SHR during and after geomagnetic storms (GS).
  • Higher GMA levels and GS periods were associated with a higher probability of ROSC in patients with SHR.
  • The effect of GMA on ROSC was modified by SHR, particularly in males and those with cardiac causes.

Conclusions:

  • Geomagnetic activity may influence OHCA resuscitation outcomes, with different effects depending on SHR.
  • The interaction between GMA, SHR, and patient characteristics (sex, cardiac cause) warrants further research.
  • Understanding environmental factors like GMA could inform strategies for improving OHCA survival.