Key result
Beat-to-beat left ventricular performance in atrial fibrillation shows no dependence on afterload.
Beat to beat left ventricular performance in spontaneous atrial fibrillation is independent of afterload.
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May support load-independent LV metrics in spontaneous AF; leaves open prospective validation before clinical adoption.
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Mark I. M. Noble (2000) studied this question. Beat-to-beat left ventricular performance in spontaneous atrial fibrillation does not depend on afterload.
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