What is a common symptom.
Asymptomatic (common): especially with first-degree and Mobitz type I blocks
Irregular rhythms (e.g., Mobitz I): palpitations
Describe clinical features of end-organ hypoperfusion.
Clinical features of end-organ hypoperfusion (due to bradycardia) may be present, including: [9]
Fatigue
Exercise intolerance
Dyspnea
Dizziness
Syncope
Describe clinical features of loss of atrioventricular synchony.
Loss of atrioventricular synchrony (e.g., extreme 1° AV block or 3° AV block) :
Feeling of pulsations in the neck or chest
Cannon A waves: physical examination finding seen in AV dissociation (e.g., in third-degree heart block)
Caused by the atria and ventricles contracting simultaneously, which leads to blood being pushed against a closed tricuspid valve
The result is a retrograde pressure wave throughout the venous system that may appear as pulsations in the jugular vein.
Symptoms of heart failure
List clinical features of significant pauses or asystole.
Stokes-Adams attacks
Sudden losses of consciousness that may occur with brief prodromal symptoms, e.g., dizziness, or without any warning, usually lasting a few seconds
Attacks are caused by ventricular asystole, most commonly due to third-degree heart block, especially idiopathic paroxysmal AV block.
Cardiac arrest
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