This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Medicine
[{'content': 'ECG change suggestive of hypokalemia is: \nSelect and explain. \nA. Absent P wave, B. Delta wave, C. U wave, D. Global ST elevation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: c (U wave)Ref: Harrison, 17th ed. pg. 282Hypokalemia is associated with ST depression, prolonged PR interval, flattened or Inverted T waves,Prominent U waves and rarely S - A block.Hypokalaemia Hyperkalaemia- ST depression- Increased T wave amplitude- Flattened or inverted- Peaked T wavesT wave- Prominent U wave- Prolonged PR interval- Prolonged P-R interval- Prolonged QRS duration- Rarely S-A block- AV conduction delay- Loss of P waves- Sine wave pattern- Ventricular fibrillation or asystoleSome more ECG patterns:Delta wave - WPW syndrome Osborn waves -Hypothermia (Camel hump sign) Epsilon waves -ARVD (Arrythmogenic RV dysplasia) QT prolongation -Hypocalcaemia Short QT -Hypercalcaemia', 'role': 'assistant'}]