Heart rate variability and diastolic heart failure.

Area of Science:

• Cardiology
• Autonomic Nervous System Function

Background:

• Diastolic heart failure (HFpEF) affects up to 40% of congestive heart failure patients.
• While HFpEF has a better prognosis than systolic heart failure, mortality remains higher than in the general population.
• Reduced heart rate variability (HRV), a marker of autonomic dysfunction, is linked to increased mortality in systolic heart failure.

Purpose of the Study:

• To investigate alterations in heart rate variability (HRV) in patients with diastolic heart failure.
• To compare HRV in diastolic heart failure patients with those having systolic heart failure and healthy controls.

Main Methods:

• Twenty-four hour ambulatory Holter recordings were conducted.
• HRV was analyzed using time and frequency domain variables.
• Three groups were studied: diastolic heart failure (n=19), systolic heart failure (n=9), and healthy controls (n=9).

Main Results:

• Both time and frequency domain HRV variables were reduced in both heart failure groups compared to controls.
• Diastolic heart failure patients exhibited relatively higher HRV values than systolic heart failure patients (SDNN, Total power, ULF power, P
• Reduced HRV in diastolic dysfunction suggests a disturbed sympathetic-parasympathetic balance.

Conclusions:

• Patients with diastolic heart failure demonstrate reduced HRV, indicative of autonomic dysfunction.
• The HRV reduction is less profound in diastolic dysfunction compared to systolic dysfunction.
• This relative preservation of autonomic balance may contribute to the better prognosis observed in diastolic heart failure.