Fluency and confidence predict paramedic diagnostic intuition: An experimental study of applied dual-process theory

Introduction. Paramedics care for the sick and injured in a variety of settings and have been observed to form an impression of their patient prior to meeting them based on limited information. We report an experiment using Australian paramedics (n=64) and Australian paramedicine undergraduates (n=44), which considered the processes underlying the formation of an intuitive diagnostic impression. Previous research has signalled roles for objective likelihood of the disease, subjective typicality of the disease, and the ease with which the impression comes to mind (answer fluency) as important in impression formation.Method. Participants completed four brief written clinical vignettes under time pressure and with a concurrent navigation task to simulate conditions faced by paramedics prior to meeting a patient. The vignettes varied the objective likelihood of a diagnosis of Acute Coronary Syndrome (ACS), a condition often encountered by paramedics characterised by ambiguity and a need for accuracy. Diagnostic impression, confidence and subjective typicality of the vignette were self-reported while answer fluency was measured. Results. Likelihood, answer fluency, self-reported typicality and confidence predicted the impression but there was no effect of experience. Students and experienced paramedics had comparable accuracy and performance. Conclusion. The results support a role for answer fluency and confidence in forming that impression. We have shown it is possible to experimentally manipulate various factors associated with paramedic diagnostic impressions. These experimental methods can form the basis for additional studies into paramedic decision making.