This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Integrated QBank, Subject name: Unknown
You are posted as an EMO on duty. You receive a call at 11:30 PM, regarding an unconscious patient who arrives in an ambulance after 15 minutes. On assessment, you barely feel the radial pulse. No evidence of trauma noted. SBP is 58 mm Hg. You note the following finding while ECG is carried out. Patient had the following USG film . Which electrolyte abnormality is likely to cause the above clinical scenario? 
Select and explain. 
A. Hypokalemia, B. Hyperkalemia, C. Hypocalcemia, D. Hypercalcemia
B: Hyperkalemia
Answer: B: Hyperkalemia 
Explanation: The patient has sinusoidal ventricular rhythm, which is due to electrolyte abnormality in above case. The patient has USG repo suggestive of CKD due to raised coical echogenicity. AV fistula in forearm is suggestive that patient undergoes dialysis but may have missed and landed up in hyperkalemia. As a pa of management, defibrillation and control of hyperkalemia is priority while emergency hemodialysis is being readied.