Arrhythmias, Cardiac

The grounding supports several etiologic categories rather than a single cause. Arrhythmias may be associated with inherited cardiovascular disease, including genetic arrhythmic disorders and genetic dilated cardiomyopathy, and they may also be chemically induced. In acute COVID-19 cardiovascular syndrome, ventricular arrhythmias can occur in the setting of myocardial injury, with suspected causes including myocarditis, microvascular injury, systemic cytokine-mediated injury, stress-related cardiomyopathy, or possible direct viral replication in cardiomyocytes and pericytes.

The literature describes arrhythmogenesis as arising from abnormalities in cardiac electrophysiology across scales from ion channels to the whole organ. Mechanistically, arrhythmias reflect disturbed impulse generation or conduction and can be influenced by changes in heart rate, hemodynamics, stroke volume, exercise, and consensus-related electrophysiologic behavior. In some settings, such as acute COVID-19 cardiovascular syndrome, arrhythmias accompany cardiomyopathy and hemodynamic instability.

Inherited cardiovascular disease is a risk context for arrhythmic disorders, and genetic dilated cardiomyopathy is specifically linked with increased risk of arrhythmias and sudden cardiac death. The grounding also supports fetal and neonatal periods as vulnerable settings because immature myocardium can make bradyarrhythmias and tachyarrhythmias more hemodynamically significant. Acute COVID-19 hospitalization is another context in which ventricular arrhythmias have been reported.

Management is described at the modality and drug-class level rather than as a single uniform regimen. The grounding supports cardiac pacing and lead devices for conduction diseases, pharmacological antiarrhythmic treatment in fetal and neonatal arrhythmias, and broader electrophysiology-based management informed by diagnosis, classification, and genetic testing in inherited cardiovascular disease. In acute COVID-19 cardiovascular syndrome, management is framed around supportive and cardiovascular care for arrhythmias and hemodynamic instability.