This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
These ECG changes are seen in 
Select and explain. 
A. Hyponatremia, B. Hypernatremia, C. Hypokalemia, D. Hyperkalemia
D: Hyperkalemia
Answer: D: Hyperkalemia 
Explanation: Classically, the electrocardiographic manifestations in hyperkalemia progress from tall peaked T waves (5.5-6.5 mM) to a loss of P waves (6.5-7.5 mM) to a widened QRS complex (7.0-8.0 mM), and, ultimately, a to a sine wave pattern (>8.0 mM). Ref: Harrison 19e pg: 310