Impact of different dipping patterns on left atrial function in hypertension

Area of Science:

• Cardiology
• Hypertension Research
• Echocardiography

Background:

• Hypertension is a prevalent cardiovascular risk factor.
• Circadian blood pressure (BP) patterns, such as dipping and nondipping, are associated with target organ damage.
• Left atrial function plays a crucial role in cardiovascular health.

Purpose of the Study:

• To investigate left atrial phasic function in newly diagnosed hypertensive patients.
• To determine the association between circadian blood pressure patterns and left atrial function.

Main Methods:

• 256 untreated hypertensive patients underwent 24-h ambulatory BP monitoring and echocardiography.
• Patients were categorized into dippers, extreme dippers, nondippers, and reverse dippers based on nocturnal BP drop.
• Left atrial reservoir, conduit, and contractile functions were assessed using echocardiographic parameters.

Main Results:

• Nondippers and reverse dippers exhibited lower left atrial emptying fractions compared to dippers and extreme dippers.
• Reverse dippers showed reduced reservoir and contractile atrial strains.
• Nondipping and reverse dipping BP patterns were independently associated with reduced reservoir function.
• Reverse dipping was uniquely associated with reduced conduit and contractile functions, independent of other factors.

Conclusions:

• Nondipping and reverse dipping blood pressure patterns are linked to impaired left atrial phasic function.
• The reverse dipping pattern is an independent predictor of decreased reservoir, conduit, and contractile left atrial function, irrespective of other clinical parameters.