HP CHO -9 October 2022: What is the primary purpose of administering potassium chloride infusion to a patient with diabetic ketoacido…

HP CHO -9 October 2022

Medical & Surgical Nursing

Hard

Appeared in: HP CHO -9 October 2022

Explanation

In Diabetic Ketoacidosis (DKA), there is a total body deficit of potassium, but initial serum levels can be normal or high due to acidosis causing an extracellular shift.
Insulin therapy, a cornerstone of DKA treatment, causes potassium to rapidly move from the bloodstream back into the cells.
This intracellular movement leads to a sharp drop in serum potassium (hypokalemia).
The primary purpose of the potassium chloride infusion is to replace the potassium being driven into the cells, thus preventing severe, life-threatening hypokalemia and its complications like cardiac arrhythmias.

Option A: While severe hypokalemia can cause respiratory muscle weakness leading to shallow breathing (hypopnea), this is a potential symptom, not the primary reason for KCl administration. The most immediate life-threatening risk is cardiac arrhythmia.
Option B: Flaccid paralysis is a severe manifestation of hypokalemia. However, the KCl infusion is given to prevent the drop in potassium that leads to such symptoms. The option describes a consequence, whereas the correct answer describes the underlying physiological mechanism being managed.
Option D: Cerebral edema is a serious complication of DKA treatment, but it is primarily related to rapid shifts in fluid and osmolality (especially a rapid drop in blood glucose and serum sodium), not directly to potassium levels.

Clinical Relevance

Nursing practice connection: Knowing Potassium management during treatment of Diabetic Ketoacidosis (DKA) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
A critical nursing responsibility in DKA management is the frequent monitoring of serum electrolytes, especially potassium, before and during insulin infusion.
Never administer insulin to a DKA patient with a potassium level below 3.3 mEq/L without first starting potassium replacement. Doing so can precipitate a fatal cardiac arrhythmia.
Always verify adequate renal function (urine output) before administering potassium to prevent iatrogenic hyperkalemia.

How to Approach the Question

First, identify the core topic: the role of potassium in DKA treatment.
Recall the pathophysiology of DKA: insulin deficiency and acidosis cause potassium to shift out of cells, but total body potassium is low due to diuresis.
Analyze the effect of the primary treatment for DKA, which is insulin. Remember that insulin drives potassium into cells.
Connect these two facts: starting insulin will cause serum potassium to drop suddenly and dangerously.
Evaluate the options. The correct option must describe this process of replacing potassium as it moves intracellularly.
Eliminate options that describe secondary symptoms (paralysis, hypopnea) or unrelated complications (cerebral edema).

Concept Tested & Keywords

Concept Tested: Potassium management during treatment of Diabetic Ketoacidosis (DKA).
Stem keywords: potassium chloride infusion, diabetic ketoacidosis, primary purpose
Lead-in keywords: primary purpose
Negative lead-in flag: false

QZh_ejCM9BD91zD529ngEG

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 568-570

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 546-548

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1330-1332