• Resuscitation · Jan 2014

    Optimal loop duration during the provision of in-hospital advanced life support (ALS) to patients with an initial non-shockable rhythm.

    • Trond Nordseth, Dana Peres Edelson, Daniel Bergum, Theresa Mariero Olasveengen, Trygve Eftestøl, Rune Wiseth, Jan Terje Kvaløy, Benjamin S Abella, and Eirik Skogvoll.
    • Department of Circulation and Medical Imaging, Faculty of Medicine, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway; The Norwegian Air Ambulance Foundation, NO-1441 Drøbak, Norway; St. Olav University Hospital, NO-7006 Trondheim, Norway. Electronic address: trond.nordseth@ntnu.no.
    • Resuscitation. 2014 Jan 1;85(1):75-81.

    BackgroundIn advanced life support (ALS), time-cycled "loops" of chest compressions form the basis of action. However, the provider must compromise between interrupting compressions and detecting a change in cardiac rhythm. An "optimal" loop duration would best balance these choices. The current international CPR guidelines recommend 2-min loop durations. The aim of this study was to investigate the "optimal" loop duration in patients with initial asystole or pulseless electrical activity (PEA).Materials And MethodsDetailed defibrillator recordings from 249 in-hospital cardiac arrests at the University of Chicago Medicine (Chicago, IL) and St. Olav University Hospital (Trondheim, Norway) were analysed. The clinical states of asystole, PEA, ventricular fibrillation/-tachycardia (VF/VT) and return of spontaneous circulation (ROSC) were annotated along the time axis. PEA and asystole were combined as a single state for the analysis of state development. The probability of staying in PEA/asystole over time was estimated non-parametrically. In addition, to distinguish between initial and secondary PEA/asystole, the latter was defined by the transition from VF/VT or ROSC.ResultsAmong patients with initial PEA (n=179), 25% and 50% of patients had left PEA/asystole after 4 and 9 min of ALS efforts, respectively. The corresponding time points for patients with initial asystole (n=70) were 7.3 and 13.3 min, respectively. The probability of transition from secondary PEA/asystole to ROSC or VF/VT varied between 10% and 20% in each 2-4 min interval.ConclusionThe "optimal" first loop duration may be 4 min in initial PEA and 6-8 min in initial asystole. If secondary PEA/asystole is encountered, 2-min loop duration seems appropriate.Copyright © 2013 Elsevier Ireland Ltd. All rights reserved.

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