Abstract
Cardiac arrhythmias are a very common reason for consultation in emergency departments. The most common symptoms that occur are palpitations, chest pain, dyspnea, symptoms of low cardiac output, and syncope, although they can be diagnosed as an incidental asymptomatic finding. The detailed, systematic analysis of a 12-lead electrocardiogram is one of the fundamental tools for its diagnosis. They are classified as tachyarrhythmias and bradyarrhythmias, each of which has specific management according to the symptoms they produce and if they are accompanied by hemodynamic instability or not. Atrial fibrillation is the arrhythmia that causes the most consultations in the emergency department. When faced with wide QRS tachycardia, ventricular tachycardia should be suspected. Immediate care and treatment are needed to reverse it due to its potential mortality, even if it is associated with hemodynamic stability.
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