Question
The following ECG findings are seen in hypokalemia:
| A. |
Increased PR interval with ST depression
|
| B. |
Increased PR interval with peaked T wave
|
| C. |
Prolonged QT interval with T wave inversion
|
| D. |
Decreased QT interval with ST depression
|
Show Answer
|
Correct Answer » C
Explanation
|
|
C. Prolonged QT interval with T wave inversion
ECG Changes in Hypokalemia:
Hypokalemia(low serum potassiumcardiac repolarization.
-
T wave inversion or flattening is an early sign of hypokalemia.
-
Prolonged QT interval (technically due to prolonged QU interval) results from delayed ventricular repolarization.
-
U waves may also appear (best seen in precordial leads), creating a prolonged apparent QT.
-
These findings increase the risk of arrhythmias, especially ventricular ectopy or torsades de pointes.
