The study was designed to compare the efficacy of controlled simulation mannequin (SM) assisted learning and case study presentation on knowledge and confidence of nurse practitioner (NP) students in managing a cardiac event. Twenty-three volunteer students were randomly assigned to the experimental (simulation) or control (case study presentation) group. All participants were instructed on atrial arrhythmias, were pre- and post-tested on knowledge and confidence, and completed an evaluation of the experience. There were no statistically significant differences in knowledge test scores, although the control group scored significantly higher on post- test confidence (p=.040). Both groups rated their experience as valuable. The simulation and case study presentation had similar outcomes. Additional research is needed to determine the effectiveness of this teaching modality.