Association between left ventricular mechanics and heart rate variability in untreated hypertensive patients

Area of Science:

• Cardiology
• Cardiovascular Physiology
• Medical Imaging

Background:

• Hypertension is a major risk factor for cardiovascular disease.
• Left ventricular (LV) mechanics and heart rate variability (HRV) are crucial indicators of cardiac health.
• The relationship between LV mechanics and HRV in untreated hypertensive patients requires further investigation.

Purpose of the Study:

• To investigate left ventricular (LV) mechanics and heart rate variability (HRV) in untreated hypertensive patients.
• To determine the relationship between LV mechanics and HRV in this population.
• To assess the impact of hypertension on cardiac function using advanced echocardiography.

Main Methods:

• Inclusion of 63 untreated hypertensive patients and 45 healthy controls.
• Utilizing 24-hour Holter monitoring for HRV assessment.
• Performing two- and three-dimensional echocardiography for detailed LV mechanics evaluation.

Main Results:

• Hypertensive patients exhibited significantly reduced HRV parameters (time and frequency domains).
• Both 2D (longitudinal, circumferential) and 3D LV strain parameters were significantly decreased in hypertensive patients.
• LV deformation parameters were independently associated with HRV, even after accounting for LV structure and function.

Conclusions:

• Untreated hypertension leads to significant impairments in both LV mechanics and HRV.
• Two- and three-dimensional echocardiographic measures of LV deformation are independently associated with HRV parameters in hypertensive individuals.
• These findings highlight the complex interplay between cardiac mechanics and autonomic function in early hypertension.