Cardiology>>>>>Electrocardiographic Interpretation
Question 4#

The ECG changes in the figure below:

are suggestive of:

a. Hypercalcemia
b. Hyperkalemia
c. Hypokalemia
d. Hypocalcemia
e. Digitalis toxicity

Correct Answer is C


On this electrocardiogram, there is a sinus rhythm. It is sinus bradycardia. There is a prolongation of the QT interval. In this case, there is ST-segment depression, T-wave flattening, and TU fusion with prominent U waves in the lateral precordial leads. This should suggest hypokalemia. Another possibility is digitalis plus an antiarrhythmic drug’s effects (such as quinidine or procainamide).