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[Variability of heart rate in hypertensive patients: clinical and physiopathological implications]
G Mancia1, M Di Rienzo, G Parati
1Istituto di Medicina Interna I, Ospedale S. Gerardo di Monza e Università degli Studi di Milano.
Insights
Heart rate variability (HRV) in essential hypertension shows a circadian pattern. Spectral analysis reveals frequency-specific fluctuations, similar to normotensive individuals, highlighting the role of baroreflexes in modulating HRV.
Area of Science:
- Cardiovascular Physiology
- Hypertension Research
- Autonomic Nervous System Function
Background:
- Essential hypertension is characterized by elevated blood pressure.
- Heart rate variability (HRV) reflects autonomic nervous system activity.
- Previous studies explored HRV in hypertensive patients using ambulatory monitoring.
Purpose of the Study:
- To investigate heart rate variability patterns in essential hypertension.
- To analyze circadian rhythms and frequency-specific heart rate fluctuations.
- To examine the role of arterial baroreflexes in modulating HRV.
Main Methods:
- Utilized 24-hour ambulatory blood pressure and heart rate monitoring.
- Employed spectral analysis to assess heart rate fluctuations at various frequencies.
- Investigated baroreflex sensitivity using time and frequency domain analysis of spontaneous fluctuations.
Main Results:
- Confirmed a distinct circadian pattern in heart rate fluctuations for hypertensive individuals.
- Spectral analysis indicated that frequency-specific HRV components in mild to moderate hypertensives are comparable to normotensive subjects.
- Demonstrated the significant role of arterial baroreflexes in modulating HRV.
Conclusions:
- Circadian heart rate variability patterns are present in essential hypertension.
- Specific frequency-domain HRV measures may not significantly differ between mild/moderate hypertensives and normotensives.
- Dynamic monitoring of baroreflex sensitivity in daily life is feasible and crucial for understanding hypertension.
Abstract:
Heart rate variability has been investigated in essential hypertension by studies combining 24-hour ambulatory blood pressure and heart rate monitoring techniques. These studies have shown a clear circadian pattern of heart rate fluctuations. By means of spectral analysis it has also been possible to describe the changes over the 24 hours of specific heart rate fluctuations occurring at various frequencies, which, at least in mild to moderate hypertensives, are not different from those of normotensive subjects. Laboratory studies have also shown the important role exerted by arterial baroreflexes in modulating heart rate variability. Finally, recent methods have been developed to dynamically monitor changes in baroreflex sensitivity in daily life conditions through the time domain or frequency domain analysis of spontaneous blood pressure and heart rate fluctuations.