A study into the feasibility of using HRV variables to guide treatment in patients with paroxystic sympathetic hyperactivity in a neurointensive step-down unit

Observational study on passive leg raising and the autonomic nervous system

“…The ECG was recorded for HRV analysis in the spectral aspect. This is often applied when associations between ANS activity and clinical conditions are evaluated, for example, as a prognostic index for metabolic syndrome, heart failure, and neuroprognostication (Henden et al, 2014; Honoré et al, 2019; Vistisen et al, 2014). The reflection of the ANS subdivisions in the powers of LF, HF, and the LF/HF ratio is straightforward (with reservations noted above) and generally available in digital signal analysis applying fast Fourier transformation (FFT).…”