Background Power spectral analysis of heart rate variability is used to assess cardiac autonomic
function. The relationship of low frequency (LF) power to cardiac sympathetic tone has …

Supine hypertension occurs commonly in primary chronic autonomic failure. This study
explored whether supine hypertension in this setting is associated with orthostatic hypotension (…

BACKGROUND: Power spectral analysis of heart rate variability (HRV) has been used to
indicate cardiac autonomic function. High-frequency power relates to respiratory sinus …

Patients with Parkinson disease often have orthostatic hypotension. Neurocirculatory
abnormalities underlying orthostatic hypotension might reflect levodopa treatment. Sixty-six …

Background Power spectral analysis of heart rate variability (HRV) has been used to indicate
cardiac autonomic function. High-frequency power relates to respiratory sinus arrhythmia …

Patients with Parkinson's disease (PD) often have manifestations of autonomic failure.
About 40% have neurogenic orthostatic hypotension (NOH), and among PD+NOH patients …

Objectives The causes of paroxysmal hypertension in patients in whom pheochromocytoma
has been excluded (‘pseudopheochromocytoma’) usually remain unclear. Blood pressure …

Background— Chronic orthostatic intolerance (COI) occurs in postural tachycardia syndrome
(POTS) and in some individuals with repeated neurocardiogenic syncope/presyncope (…

BACKGROUND: Diseases characterized by neurogenic orthostatic hypotension (NOH), such
as Parkinson disease (PD) and pure autonomic failure (PAF), are associated with cardiac …

Background: Neurogenic orthostatic hypotension (OH) characterizes pure autonomic failure
(PAF), multiple system atrophy (MSA), and Parkinson disease (PD) with autonomic failure. …