Why are so many critical care nurses unable to recognize ventricular tachycardia in the 12-lead electrocardiogram?

We submitted the 12-lead electrocardiogram of an easily recognized ventricular tachycardia to more than 2500 critical care nurses for diagnosis. Seventy-eight percent of these failed to diagnose ventricular tachycardia, opting for supraventricular tachycardia with ventricular aberration. It was clear that only 0.5% of 2500 experienced nurses knew the three clues available for diagnosing ventricular tachycardia.