USMLE/COMLEX - Step 2 - Atrial Fibrillation
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What is the most common arrythmia?
Atrial fibrillation
What is the pathology?
Focal ectopic activity in the atria
How will the patient present?
Palpitations, syncope, fatigue, dizziness, chest pain
Which heart sound will be heard on auscultation?
S3
What is the mechanism by which a third heart sound is present?
Rapid deceleration of blood flowing against a stiff ventricle during diastole
What will an ECG show?
Absent P waves
How is Atrial Fibrillation managed?
Unstable patients: electrical cardioversion
Stable patients: rhythm control