EFFECT OF 35 YEARS BETA-ADRENERGIC BLOCKADE THERAPY ON AUTONOMIC CARDIOVASCULAR MODULATION. A CASE STUDY

Abstract

The influence of long duration β-blockade on autonomic and cardiovascular function remains not completely understood. The aim of this study was to evaluate the effect of long duration β-adrenergic blockade treatment for hypertension control, on autonomic cardiovascular control in a 78 year old male patient in relation to population findings.

Heart rate variability was determined in the frequency domain (Total power, low frequency power and high frequency power), during baseline (supine and standing) and during 24 hour Holter recording. Results were compared with heart rate and heart rate variability data obtained from a normal healthy male population as a function of age.

Circadian rhythm remained present. Heart rate during daytime was lower compared to the population group. None of the heart rate variability parameters were different from the normal population age group.

Our results show that after 35 years of β-blockade treatment, autonomic modulation of cardiac function remains within normal limits for that age group. Blood pressure remained at the higher limits (120-150/60-80 mmHg), but under control.

Keywords:

• hypertension control
• autonomic cardiac control
• heart rate variability
• power spectral analysis
• β-adrenergic receptor blockade
• aging