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

Area of Science:

• Cardiology
• Cardiovascular Imaging
• Pharmacology

Background:

• Impaired left atrial (LA) mechanical function is a known complication of hypertension.
• The impact of different antihypertensive drug classes on LA function remains largely unknown.
• LA dysfunction contributes to atrial arrhythmias, stroke, and heart failure.

Purpose of the Study:

• To investigate the association between antihypertensive medication use and LA mechanical function in hypertensive patients.
• To determine if specific antihypertensive drug classes differentially affect LA function.

Main Methods:

• Cardiac MRI with feature-tracking was used to assess LA strain in 212 hypertensive subjects.
• Multivariable regression models were employed to analyze associations, adjusting for relevant clinical and demographic factors.
• LA function was evaluated based on reservoir, conduit, and booster pump capacities.

Main Results:

• Beta-blocker use was significantly associated with impaired LA reservoir function (lower total longitudinal strain and expansion index).
• Conduit function was also impaired in beta-blocker users (lower positive strain and early diastolic strain rate).
• Booster pump function was reduced, indicated by lower late-diastolic strain/strain rate and active LA emptying fraction.

Conclusions:

• Beta-blocker therapy is linked to impaired left atrial mechanical function in hypertension.
• This association may contribute to the increased risk of atrial fibrillation and stroke observed with beta-blockers in recent studies.
• Other antihypertensive agents did not show a significant association with impaired LA function.