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Background  Impaired left atrial ( LA ) mechanical function is present in hypertension and likely contributes to various complications, including atrial arrhythmias, stroke, and heart failure. Various antihypertensive drug classes exert differential effects on central hemodynamics and left ventricular function. However, little is known about their effects on  LA  function.    Methods and Results  We studied 212 subjects with hypertension and without heart failure or atrial fibrillation.  LA  strain was measured from cine steady‐state free‐precession cardiac  MRI  images using feature‐tracking algorithms. In multivariable models adjusted for age, sex, race, body mass index, blood pressure, diabetes mellitus,  LA  volume, left ventricular mass, and left ventricular ejection fraction, beta‐blocker use was associated with a lower total longitudinal strain (standardized β=−0.21;  P =0.008), and lower  LA  expansion index (standardized β=−0.30;  P <0.001), indicating impaired  LA  reservoir function. Beta‐blocker use was also associated with a lower positive strain (standardized β=−0.19;  P =0.012) and early diastolic strain rate (standardized β=0.15;  P =0.039), indicating impaired  LA  conduit function. Finally, beta‐blocker use was associated with a lower (less negative) late‐diastolic strain (standardized β=0.15;  P =0.049), strain rate (standardized β=0.18;  P =0.019), and a lower active  LA  emptying fraction (standardized β=−0.27;  P <0.001), indicating impaired booster pump function. Use of other antihypertensive agents was not associated with  LA  function.    Conclusions  Beta‐blocker use is significantly associated with impaired  LA  function in hypertension. This association could underlie the increased risk of atrial fibrillation and stroke seen with the use of beta‐blockers (as opposed to other antihypertensive agents) demonstrated in recent trials.

Beta‐Blocker Use Is Associated With Impaired Left Atrial Function in Hypertension