Giulia Sandrone

TL;DR: The spontaneous beat-to-beat oscillation in R-R interval during control recumbent position, 90° upright tilt, controlled respiration and acute and chronic β-adrenergic receptor blockade was analyzed, indicating that sympathetic nerves to the heart are instrumental in the genesis of low-frequency oscillations in R -R interval.

TL;DR: Data indicate that the sympathetic predominance that is detectable 2 weeks after AMI is followed by recovery of vagal tone and a normalization of sympathovagal interaction, not only during resting conditions, but also in response to a sympathetic stimulus.

TL;DR: Results indicate that beta-blocker administration has important effects on RR interval variability and on its spectral components, and the observed reduction in signs of sympathetic activation and the increase in vagal tone after beta blockade help to explain the beneficial effects of these drugs after myocardial infarction.

TL;DR: The power spectral density (PSD) estimate of heart rate variability is capable of detecting an early alteration in sympatho-vagal balance of cardiac control present in uncomplicated hypertension.

TL;DR: In patients after acute myocardial infarction with a reduced EF, the reduction in HRV is associated with a different distribution of the residual power in the entire frequency range, which suggests a diminished responsiveness of sinus node to neural modulatory inputs.