![]() ResultsĪcross all cases, participants from all groups responded faster and made fewer errors when blood pressure and heart rate observations were graphed separately, especially when a track-and-trigger system was present. Participants (tested between January–May 2011) judged whether observations were physiologically normal or abnormal. For each design, eight cases contained normal data and eight contained an abnormal systolic blood pressure or heart rate observation (half of which yielded a Seagull Sign on overlapping plots). ![]() The designs represented a crossing of the graph format and alerting system variables. Over 64 experimental trials, ‘Seagull-trained’ nurses and novices randomly assigned to receive ‘Seagull training’ or remain untrained, viewed sequences of blood pressure and heart rate observations recorded on four different chart design extracts. overlapping) and alerting system (integrated colour-based track-and-trigger system present vs. DesignĪ 3 × 2 × 2 mixed-design experiment, with three independent variables: participant group, graph format (separate vs. One justification is the use of a visual cue called the ‘Seagull Sign’ to detect physiological abnormalities. Many health professionals prefer blood pressure and heart rate graphs to overlap. To investigate whether overlapping blood pressure and heart rate graphs improve chart-users' ability to recognize derangements in these vital signs on hospital observation charts.
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