Nonstandard Abbreviations and Acronyms
atrial fibrillationleft atriumleft atrium emptying fractionleft atrial reverse remodelingleft atrial strain contractile functionleft atrial strain reservoir functionlong-standing persistent atrial fibrillationleft ventriclesinus rhythmvariance inflation factorR. Khattar and T. Wong contributed equally as joint senior authors.For Sources of Funding and Disclosures, see page 464.Supplemental Material is available at 