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55.

Which of the following are characteristic of ECG in hypokalemia? 1) elongation of PR interval; 2) flattening of P wave; 3) widening of QRS complexes; 4) depression of ST segments; 5) increased amplitude and width of U waves. The correct answer is:

A. 1,3,5
B. 1,2,3
C. 1,3,4,5
D. 2,3,5
E. 2.4

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