Background Prolonged preshock pauses are associated with negative effects on patient outcomes and survival. A greater understanding of these pauses may help to improve the quality of advanced life support (ALS) and clinical outcomes. Objective The objective of this study was to identify the pauses that occur during ALS situations in high-fidelity simulation scenarios and the frequency and duration of these pauses. Methods One hundred forty-two nursing students participated in this cross-sectional study, involving high-fidelity simulation scenario of cardiorespiratory arrest in a simulated hospital room. Pauses were assessed using an observation checklist. Results Students performed the scenario in an average time of 8.32 (standard deviation = 1.13) minutes. Pauses between chest compressions were longer than recommended (mean = 0.36, standard deviation = 1.14). A strong positive correlation was found between the identification of the arrhythmia and the initiation of countershock (rs = 0.613, p Conclusions Nursing students generally performed ALS within the time limits recommended by resuscitation guidelines. Early identification of shockable rhythms may lead to early nurse-initiated defibrillation. Strategies to speed up the identification of arrhythmias should be put in place to minimise preshock pauses and improve ALS outcomes.