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Acute hyperkalemia is associated with which of the
following electrocardiographic changes?
A. QRS widening
B. Prolongation of the ST segment
C. A decrease in the PR interval
D. Prominent U waves
E. T-wave flattening
V-26. All of the following
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a wide QRS, other features are:flat P and peaked T
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The answer is A.Hyperkalemia leads to partial depolarization of cardiac
cells. As a result, there is slowing of the upstroke of the action potential as well as reduced
duration of repolarization. The T wave becomes peaked, the RS complex widens and may
merge with the T wave (giving a sine-wave appearance), and the P wave becomes shallow
or disappears. Prominent U waves are associated with hypokalemia; ST-segment prolongation
is associated with hypocalcemia.
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thnx woody good expalanation.