The main characteristic of postural orthostatic tachycardia syndrome (POTS) is tachycardia
when standing, without a drop in blood pressure. Patients describe lightheadedness and …

Syncope is a highly prevalent clinical condition characterized by a rapid, complete, and brief
loss of consciousness, followed by full recovery caused by cerebral hypoperfusion. This …

Background Many COVID-19 patients are left with symptoms several months after resolution
of the acute illness; this syndrome is known as post-acute sequalae of COVID-19 (PASC) …

Ultra-short-term (UST) heart rate variability (HRV) metrics have increasingly been proposed
as surrogates for short-term HRV metrics. However, the concurrent validity, within-day …

Orthostatic hypotension (OH) is highly prevalent in older adults and associated with
dizziness, falls, lower physical and cognitive function, cardiovascular disease, and mortality …

Abnormalities in orthostatic blood pressure changes upon active standing are associated
with morbidity, mortality, and reduced quality of life. However, over the last decade, several …

Purpose Sarcopenia and delayed orthostatic blood pressure (BP) recovery are two
disorders increasingly associated with adverse clinical outcomes in older adults. There may …

Spectral analysis of heart rate variability (HRV) is widely used as a non‐invasive method to
assess the cardiovascular autonomic function. Of the two main frequency components of …

Previous research suggested that exposure to long‐lasting or repeated laboratory stressors
may lead to rearrangement of cardiovascular control, with a shift of regulation mechanisms …

Patient positioning is one of the milestones of neurological surgery, which significantly
affects the surgical outcome and requires a multidisciplinary approach. Several positions are …