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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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Introduction Cardiac Emergencies01:30

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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)...
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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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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...
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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...
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An Electrical Storm Is Coming!: Ventricular Storm Case Study.

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A patient with myocardial infarction and rapid atrial fibrillation experienced ventricular tachycardia storm despite using an external defibrillator vest. This case highlights complex cardiac emergencies and team management strategies for emergency providers.

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Area of Science:

  • Cardiology
  • Emergency Medicine
  • Electrophysiology

Background:

  • A 65-year-old male presented with epigastric and chest pain, diagnosed with ST-elevation myocardial infarction (STEMI) and rapid atrial fibrillation (AFib).
  • Initial treatment included STEMI management and AFib control, followed by transfer for percutaneous coronary intervention.

Observation:

  • Two weeks post-PCI, the patient presented with a LifeVest external defibrillator, having received over 10 shocks.
  • The patient developed ventricular tachycardia (VT) storm requiring multiple cardioversions, resuscitation, and intubation.

Findings:

  • The case details the patient's journey through STEMI, AFib, and subsequent VT storm.
  • It describes the utilization of the LifeVest external defibrillator in managing life-threatening arrhythmias.
  • The patient ultimately required transfer for electrophysiology studies and internal cardiac defibrillator implantation.

Implications:

  • This case underscores the importance of a multidisciplinary team approach in managing complex cardiac conditions.
  • It offers insights into decision-making processes for emergency providers dealing with rare and critical events.
  • Strategies for improving emergency care in complex and rare cardiac presentations are discussed.