A 28 year old drug user presents to the emergency department with collapse and anuria. His serum K+ 7.5mmol/L. CXR early pulmonary edema. What is the next appropriate management?

The key is B. IV calcium gluconate. [IV calcium gluconate is given to protect the heart from lethal arrhythmia or cardiac arrest from high potassium level and used to buy time while definitive management is being taken. Actually calcium gluconate don’t lower the potassium level that much but protect the heart from arrhythmia].