A comparison of CPR delivery with various compression-to-ventilation ratios during two-rescuer CPR.

Full Abstract

BACKGROUND: The number of chest compressions required for optimal generation of coronary perfusion pressure remains unknown although studies examining compression-to-ventilation ratios higher than 15:2 (C:V) in animals have reported higher C:V to be superior for return of spontaneous circulation and neurologic outcome. We examined human performance of two-rescuer CPR using various C:V. METHODS: Thirty six EMT-Basic students in their final week of training performed two-rescuer CPR using C:V of 15:2, 30:2, 40:2, 50:2, and 60:2 on a recording resuscitation manikin. Compression and ventilation variables were recorded by computer while the number of pauses for ventilations and the hands-off time (time not spent performing chest compressions) were abstracted by hand. Data were analyzed by ANOVA and significant differences from the standard treatment of C:V = 15:2 were assessed by Tukey's HSD post hoc test. FINDINGS: The number of compressions delivered per minute increased with increasing C:V while the hands-off time and pauses for ventilations decreased. All comparisons were significantly different from C:V = 15:2 (P < 0.001). The ventilation numbers decreased with increasing C:V although mean minute volume exceeded 1l for all C:V. INTERPRETATION: A 15:2 compression-to-ventilation ratio when performed during two-rescuer CPR results in 26s of hands off time each minute while only delivering 60 compressions. Alternative C:V ratios of 30:2, 40:2, 50:2, and 60:2 all exceed the AHA recommended 80 compressions/min while still delivering a minute volume in excess of 1l.

Author information

Author/s: Hostler, David (D); Guimond, Guy (G); Callaway, Clifton (C);

Affiliation: University of Pittsburgh, Department of Emergency Medicine and the Affiliated Emergency Medicine Residency, 230 McKee Place, Suite 500, Pittsburgh, PA 15213, USA. hostlerdp(-atsign-)upmc.edu

Journal and publication information

Publication Type: Comparative Study; Journal Article

Journal: Resuscitation (Resuscitation), published in Ireland. (Language: eng)

Reference: 2005-Jun; vol 65 (issue 3) : pp 325-8

Dates: Created 2005/05/27; Completed 2005/09/29; Revised 2009/08/25;

PMID: 15919570, status: MEDLINE (last retrieval date: 8/25/2009, IMS Date: )

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