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. 2016 Feb 23;4(4):e12716. doi: 10.14814/phy2.12716

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© 2016 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of the American Physiological Society and The Physiological Society.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Representation of the steps performed during the data analysis (HR = 2.7 Hz, SIMV with RR = 1 Hz). (A) Arterial blood pressure with systolic (squares) and diastolic blood pressure (circles). (B) Respiratory signal (CO ₂, solid line), respiratory signal values obtained at the moment that the systolic pressure is reached (squares) and Resp_HR (dashed line). (C) Interpolated PP signal. The squares depict PP at the moment systolic pressure is reached. (D) Interpolated Resp_HR. The squares depict the respiratory value at the moment systolic pressure was reached. (E) Frequency spectrum of the respiratory signal containing: RR (1), 2RR (2), and 3RR (3). (F, G) Frequency spectrum of Resp_HR and PP containing RR (1) and the alias frequencies of 2RR and 3RR (2 and 3, respectively). HR, heart rate; RR, respiratory rate; PP, pulse pressure; Resp_HR, the respiratory values at the moment systolic pressure was reached.