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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...
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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...
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Dysrhythmia management involves a multifaceted approach, incorporating pharmacological treatments, medical procedures, surgical interventions, lifestyle modifications, and patient education.Pharmacological ManagementAntiarrhythmic Drugs:Class I (Sodium Channel Blockers): This class includes quinidine and procainamide, which reduce the speed of impulse conduction in the heart, stabilize the cardiac membrane, and control arrhythmias. Quinidine and procainamide are Class IA agents that prolong the...
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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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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.
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Updated: Apr 12, 2026

A Rat Model of Ventricular Fibrillation and Resuscitation by Conventional Closed-chest Technique
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Double Sequential Defibrillation for Refractory Ventricular Fibrillation: A Case Report.

Aurora M Lybeck, Hawnwan Philip Moy, David K Tan

    Prehospital Emergency Care
    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Double sequential defibrillation, using two defibrillators simultaneously, successfully restored circulation in a patient with out-of-hospital cardiac arrest after multiple failed attempts. This advanced technique offers a potential new strategy for refractory cardiac arrest cases.

    Keywords:
    cardiac arrestcardiopulmonary arrestcardiopulmonary resuscitationdefibrillationexternalventricular fibrillation

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    Area of Science:

    • Cardiology
    • Emergency Medicine
    • Critical Care Medicine

    Background:

    • Out-of-hospital cardiac arrest (OHCA) presents a significant challenge in emergency medicine.
    • Refractory cardiac arrest, defined as arrest not responding to initial defibrillation attempts, has poor prognoses.

    Observation:

    • A 40-year-old male sustained OHCA after chest trauma during a basketball game.
    • Multiple defibrillation attempts (7) by emergency medical services and in the emergency department were unsuccessful.
    • A novel approach using double sequential defibrillation (DSD) with two defibrillators was employed.

    Findings:

    • The 8th defibrillation attempt, utilizing DSD with pads placed adjacently, successfully achieved return of spontaneous circulation (ROSC).
    • The patient recovered in the intensive care unit and was discharged after 1 month.
    • Follow-up over 1 year later showed good neurological recovery with a Cerebral Performance Category score of 1.

    Implications:

    • Double sequential defibrillation may be a viable rescue strategy for refractory ventricular arrhythmias during cardiac arrest.
    • This case highlights the importance of considering advanced resuscitation techniques when standard protocols fail.
    • Further research is warranted to establish optimal DSD protocols and its efficacy in larger patient cohorts.