G Model

ARTICLE IN PRESS

RESUS 5933 1

Resuscitation xxx (2014) xxx–xxx

Contents lists available at ScienceDirect

Resuscitation journal homepage: www.elsevier.com/locate/resuscitation

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Letter to the Editor

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Reply to Letter: A pilot study examining the role of regional cerebral oxygen saturation monitoring as a marker of return of spontaneous circulation in shockable (VF/VT) and non-shockable (PEA/Asystole) cause of cardiac arrest 3

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Sir, We are grateful for Dr Hachimi-Idrissi’s comments regarding the utility of cerebral oximetry using near infrared spectroscopy (NIRS) as a dynamic marker of the quality of chest compressions and likely surrogate for the quality of coronary artery perfusion during cardiac arrest. Our experience further supports his conclusion that while at the outset of cardiac arrest regional cerebral oxygen saturation levels (rSO2 ) may be low, in cases where return of spontaneous circulation (ROSC) is likely, there is a gradual rise in rSO2 culminating in an observed gradient between rSO2 levels at the outset of resuscitation and rSO2 levels when ROSC is achieved. This observation reinforces the importance that low cerebral oximetry values (