This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
Absent P waves with wide QRS complex indicates serum potassium of 
Select and explain. 
A. 5.4 meq/L, B. 6.5 meq/L, C. More than 8 meq/L, D. More than 1O meq/L
C: More than 8 meq/L
Answer: C: More than 8 meq/L 
Explanation: Hyperkalemia Couesy of Dr. Michael McCrea a. Tall hyperacute T wave (earliest ECG finding) b. Prolonged PR interval c. Flattened or absent P wave d. Wide QRS complex that eventually blends with the T wave to assume a "sine wave" appearance e. Hea blocks f. QT interval normal or shoened Ref: guyton and hall textbook of medical physiology 12 edition page number:184,185,186