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Related Concept Videos

Myocarditis III: Medical Management01:14

Myocarditis III: Medical Management

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Myocarditis: Comprehensive Medical ManagementMyocarditis, the heart muscle inflammation, requires a comprehensive medical management strategy that addresses the underlying cause, provides supportive care, manages symptoms, and reduces cardiac workload.Infections and Autoimmune CausesAdminister appropriate antimicrobial therapy when an infectious agent causes myocarditis. For instance, penicillin treats infections caused by Group A Streptococcus. In cases where autoimmune processes are...
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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...
377
Myocarditis I: Introduction01:21

Myocarditis I: Introduction

287
Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
287
Cardiomyopathy V: Interprofessional Care01:29

Cardiomyopathy V: Interprofessional Care

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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
253
Myocarditis IV: Nursing Management01:22

Myocarditis IV: Nursing Management

165
Myocarditis is an inflammatory condition of the myocardium requiring meticulous nursing management for optimal patient outcomes. Effective management begins with a thorough assessment of the patient's medical history, paying close attention to past infections, autoimmune disorders, travel history, and exposure to toxins or drugs. Recent viral infections and systemic diseases are particularly relevant due to their potential role in triggering myocarditis.Physical Examination and MonitoringThe...
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Myocarditis II: Clinical Features and Diagnostic Tests01:27

Myocarditis II: Clinical Features and Diagnostic Tests

199
Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...
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Related Experiment Video

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Programmed Electrical Stimulation in Mice
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Programmed ventricular stimulation in patients with active vs previous arrhythmic myocarditis.

Giovanni Peretto1, Simone Sala1, Cristina Basso2

  • 1Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Hospital and Vita-Salute University, Milan, Italy.

Journal of Cardiovascular Electrophysiology
|January 31, 2020
PubMed
Summary

Programmed ventricular stimulation (PVS) helps stratify arrhythmic risk in nonactive myocarditis patients. However, risk stratification remains complex for active myocarditis patients with ventricular arrhythmias.

Keywords:
electrophysiological studymyocarditisprogrammed ventricular stimulationsudden cardiac deathventricular arrhythmias

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Myocardial Diseases

Background:

  • Myocarditis poses a significant risk for ventricular arrhythmias (VA).
  • Programmed ventricular stimulation (PVS) is a diagnostic tool, but its role in myocarditis risk stratification is not well-established.
  • Current risk stratification for myocarditis patients with VA is complex and multifactorial.

Purpose of the Study:

  • To investigate the role of PVS in assessing arrhythmic risk in adult patients with myocarditis and VA.
  • To compare the effectiveness of PVS in active versus nonactive myocarditis.
  • To identify independent predictors of major VA in myocarditis patients.

Main Methods:

  • A single-center prospective study included 96 adult patients hospitalized with myocarditis and VA.
  • Patients were categorized into active (A) and nonactive (NA) myocarditis based on endomyocardial biopsy and cardiac MRI.
  • All patients underwent PVS; malignant VA episodes were assessed during follow-up (54 months).

Main Results:

  • PVS positivity was associated with future malignant VA (MVA) primarily in the nonactive myocarditis group (negative predictive value 90.0%).
  • In active myocarditis, PVS showed minimal predictive value for MVA (positive predictive value 43.8%).
  • Independent predictors of major VA included arrhythmic onset, fibrosis on biopsy, and positive PVS.

Conclusions:

  • PVS is a valuable tool for ruling out future MVA in nonactive myocarditis patients.
  • PVS has limited utility in predicting MVA in active myocarditis patients.
  • Comprehensive risk stratification incorporating clinical, imaging, and electrophysiological data is crucial for managing VA in myocarditis.