Objective:to compare the rate of return of spontaneous circulation (ROSC) and death after
cardiac arrest, with and without the use of a metronome during cardiopulmonary
resuscitation (CPR). Method:case-control study nested in a cohort study including 285 adults who experienced
cardiac arrest and received CPR in an emergency service. Data were collected using
In-hospital Utstein Style. The control group (n=60) was selected by matching
patients considering their neurological condition before cardiac arrest, the
immediate cause, initial arrest rhythm, whether epinephrine was used, and the
duration of CPR. The case group (n=51) received conventional CPR guided by a
metronome set at 110 beats/min. Chi-square and likelihood ratio were used to
compare ROSC rates considering p≤0.05. Results:ROSC occurred in 57.7% of the cases, though 92.8% of these patients died in the
following 24 hours. No statistically significant difference was found between
groups in regard to ROSC (p=0.2017) or the occurrence of death (p=0.8112). Conclusion:the outcomes of patients after cardiac arrest with and without the use of a
metronome during CPR were similar and no differences were found between groups in
regard to survival rates and ROSC.