This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart: Electrocardiographic Interpretation Blood Flow Abnormalities, Subject name: Physiology
ECG changes in hyperkalemia are all except - 
Select and explain. 
A. Prolonged PR interval, B. Depressed ST-segment, C. Inverted T wave, D. Wide QRS
C: Inverted T wave
Answer: C: Inverted T wave 
Explanation: Ans. is 'c' i.e., Inverted T wave HypokalemiaHyperkalemiao Prominent U wave (earliest change)o Sine wave configurationo Flattening and inversion of T-waveo Tall, tented T-wave (peaked & narrow)o Prolonged PR-interval, QRS widening (in severe H~) o Prolonged PR-interval, QRS widening and(But PR & QRS constant when K+ +- 3.5 mEq/L)o |HR (Complete heart block or ventricularo Prolonged QT intervalasystole may occur)o Depressed / sagging of ST-segmento Depressed ST-segment