Cardiology MCQ – Stroke risk in non valvar AF – Answer
Stroke risk in chronic non valvar atrial fibrillation was increased by — fold in Framingham study:
Correct answer: 2. Five fold
In the same study, chronic AF with rheumatic heart disease had 17 fold increase in stroke risk. The study report had a follow up period of 24 years.
Conventionally non valvar AF is defined as AF in the absence of moderate or severe mitral stenosis or prosthetic valve. Milder degrees of mitral stenosis and other valvular lesions are not excluded from ‘non-valvar’ AF!