Which of the following findings would be indicative reasons to abort an exercise stress test?
a. Ventricular axis of +90 c. Inverted U wave
b. Increase in blood pressure d. ST segment depression or elevation
D
Signs that can alert the nurse to stop the test include ST segment elevation equal to or greater than 1.0 mm (one small box) or ST depression equal to or greater than 2.0 mm (2 small boxes). Blood pressure is expected to rise during exercise, but a systolic blood pressure greater than 250 mm Hg or a diastolic blood pressure greater than 115 mm Hg is considered high enough to stop the test. Parameters for ventricular axis in degrees are ?2-30° to +90°. Left-axis deviation is present if the axis falls between ?2-30° and ?2-90°.
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