Autonomic nervous system activity in idiopathic dilated cardiomyopathy and in hypertrophic cardiomyopathy

Cardiac autonomic modulation and incidence of late potentials in essential hypertension: role of age, sex, ventricular mass and remodeling

“…Similarly to what Ajiki et al 54 found, in the present study patients with concentric left ventricular hypertrophy showed a higher LF/HF ratio at night-time, suggesting increased sympathetic activity and/or parasympathetic attenuation at night. The pathophysiological correlate of such a sympatho-vagal imbalance is unknown.…”

Add-On Therapy with a Nighttime Dose of Doxazosin in Patients with Uncontrolled Hypertension: Effects on Autonomic Modulation of the Cardiovascular System

“…There is no doubt that autonomic dysregulation plays an important role in the development of various complications and events in the cardiovascular system (1,2). Heart rate variability (HRV) has emerged as a practical, noninvasive tool to investigate parasympathetic tone and sympathetic-parasympathetic balance (3,4).…”

Avaliação da função autonômica na cardiomiopatia hipertrófica

“…Contrarily to what was observed by a number of studies already cited that have analyzed HRV through the use of 24 hours Holter [16][17][18][19][30][31][32] , no signifi cant compromising of the autonomic function was observed in HCM patients. In the present paper, the most observed differences were those in the last stage of autonomic evaluation, with parasympathetic activity predominating, while as previously referred to in this paper, that arm of the autonomic response was compromised.…”

“…Those using 24-hour Holter for HRV analysis found sympathetic prevailing over parasympathetic activity. Such changes were found to be correlated to the presence of symptoms, ventricular arrhythmia, and left ventricle outfl ow tract obstruction (LVO) [15][16][17][18][19] .…”

“…Opinions are controversial in that area, too, with some authors in defense of the relevance of such for autonomic modulation 22,26 and other opposing that assumption 16 . The fact is that even those who did fi nd the correlation of such data (particularly septal thickness) with autonomic function disorders did not report uniform results.…”