A 68-year-old man with a history of end-stage renal disease is brought to the emergency department due to profound generalized weakness. He missed his last two hemodialysis appointments due to transportation issues. His pulse is 55/min and blood pressure is 112/68 mm Hg. An electrocardiogram is obtained and displays peaked T waves along with a widened QRS complex. A basic metabolic panel reveals a serum potassium concentration of 7.8 mEq/L. Arrange the following therapeutic interventions in the correct chronological sequence for managing this patient's acute presentation, starting with the most immediate required step and ending with definitive treatment.
- 1Intravenous calcium gluconate administration
- 2Intravenous regular insulin and dextrose administration
- 3Emergent hemodialysis initiation
Cevap
The correct sequence is: 1) Intravenous calcium gluconate administration, 2) Intravenous regular insulin and dextrose administration, 3) Emergent hemodialysis initiation.
The correct sequence for managing severe hyperkalemia with electrocardiographic changes requires immediate protection against arrhythmias followed by progressive lowering of potassium. Intravenous calcium gluconate is given first to immediately stabilize the cardiac myocyte membrane. Next, intravenous regular insulin (with dextrose) is administered to drive potassium into the intracellular space, which temporarily lowers the serum concentration. Finally, emergent hemodialysis is initiated to definitively clear the excess potassium from the body, as the patient's end-stage renal disease prevents normal renal excretion.
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Anahtar Kavram
The acute management of severe hyperkalemia with electrocardiographic changes follows a strict three-step sequence: immediate cardiac membrane stabilization (calcium), rapid intracellular potassium shifting (insulin/glucose), and definitive total-body potassium removal (hemodialysis or cation exchangers).