Interpretation of electrocardiograms by doctors

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Abstract
An illustration of a standard electrocardiogram (8 cm × 3 cm) was presented on a single sheet of A4 paper. One hundred and fifty eight doctors of diverse specialty and seniority (table) were asked to mark the PR and QT intervals with arrows. These intervals are defined in a standard way internationally and are discussed in various text books.*RF 1-5* If a candidate was able successfully to mark the PR interval and to state what time interval the smallest square on an electrocardiogram represents when recording at standard speed (25 mm/s), he or she was deemed capable of defining PR duration. The answers were unprompted and anonymous; respondents were supervised to ensure neither consultation with colleagues nor reference to written texts. They were asked not to mention the existence of the survey to colleagues. All answers were collected in a single morning.

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