Letter to the editor regarding "Incidence, severity and detection of blood pressure and heart rate perturbations in postoperative ward patients after noncardiac surgery".

Competing Interests: Declaration of competing interest Professor Greg O'Grady and Professor Ian P. Bissett have ownership interests with The Insides Company Ltd. (Auckland, New Zealand). Professor O'Grady is an executive director, co-founder, and chief scientific officer. Professor Bissett is a co-founder and chief medical officer. Professor O'Grady is also a co-founder and chief executive officer of Alimetry Ltd. (Auckland, New Zealand). The remaining authors have no conflicts of interest to disclose.