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. 2018 Apr 20;5:111. doi: 10.3389/fmed.2018.00111

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Copyright © 2018 Colombo, Wu, Catena, Perotti, Fossali, Cioffi, Rech, Castelli and Cicardi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Power spectra of the heart periods during the ICU stay. Day 1, acute phase; Day 2, early recovery; Day 3, full recovery. On the y-axis is the power spectra density (PSD), on the x-axis is the frequency. Dotted lines represent ECG—derived respiratory rate.