You are recording an ECG; a portion of the tracing is shown here. Your patient is pale and tells you that she is a little dizzy. Which of the following is the least likely reason for the tracing? 
Definitions:
Conservative Estimates
Estimates made cautiously to ensure that the actual value is not likely to exceed the estimated value.
Sample Statistics
Statistics calculated from a sample and used to estimate parameters of the total population.
Exclusive Range
A range of values that does not include the upper and lower bounds specified.
Scores
Quantitative measurements or evaluations used to reflect the performance, ability, or other attributes of an individual or entity.
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