A 65-year-old man with end-stage renal disease presents to the emergency department with profound, generalized muscle weakness that began earlier today. He missed his last two scheduled hemodialysis sessions due to transportation issues. His blood pressure is 112/68 mmHg, pulse is 54/min, and respirations are 16/min. An electrocardiogram demonstrates absent P waves, a widened QRS complex, and tall, peaked T waves. A point-of-care basic metabolic panel reveals a serum potassium concentration of 8.2 mEq/L.
Arrange the following pharmacologic interventions in the most appropriate chronological sequence of administration for the acute management of this patient's severe hyperkalemia.
- 1Intravenous calcium gluconate
- 2Intravenous regular insulin and 50% dextrose
- 3Enteral sodium polystyrene sulfonate
Answer
The correct sequence of administration is: 1) Intravenous calcium gluconate, 2) Intravenous regular insulin and 50% dextrose, 3) Enteral sodium polystyrene sulfonate.
The fundamental principle of severe symptomatic hyperkalemia management is a three-step sequence. First, the cardiac membrane must be stabilized to prevent lethal arrhythmias using intravenous calcium. Second, potassium is shifted into cells to rapidly but temporarily lower serum levels using intravenous insulin (with dextrose). Finally, potassium is definitively removed from the body using gastrointestinal cation exchangers, loop diuretics, or hemodialysis.
Step-by-Step Solution
Key Concept
The acute management of severe hyperkalemia follows a strict sequence: stabilize the cardiac membrane (calcium), shift potassium intracellularly (insulin), and eliminate potassium from the body (binders/diuretics/dialysis).
Estimated Time:1m 0s