|
HyperK+ - woodywoodpecker
|
12-07-2008, 10:19 AM
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
12-07-2008, 10:29 AM
a wide QRS, other features are:flat P and peaked T
12-07-2008, 12:00 PM
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. |
| « Next Oldest | Next Newest » |
