NCLEX RN Quiz # 1005

NCLEX Examination.

Practice Question # 1005.

 

nclex quiz.

 

When serum potassium levels are dangerously elevated, it may be necessary to administer IV calcium gluconate. Within minutes after administration, calcium antagonizes the action of hyperkalemia on the heart. Infusion of calcium does not reduce the serum potassium concentration but immediately antagonizes the adverse cardiac conduction abnormalities. Calcium chloride and calcium gluconate are not interchangeable: calcium gluconate contains 4.5 mEq of calcium and calcium chloride contains 13.6 mEq of calcium; therefore, caution must be used.

 

Monitoring the blood pressure is essential to detect hypotension, which may result from the rapid IV administration of calcium gluconate. The ECG should be continuously monitored during administration; the appearance of bradycardia is an indication to stop the infusion. The myocardial protective effects of calcium are transient, lasting about 30 minutes. Extra caution is required if the patient has been “digitalized” (received accelerated dosages of a digitalis-based cardiac glycoside to reach a desired serum digitalis level rapidly) because parenteral administration of calcium sensitizes the heart to digitalis and may precipitate digitalis toxicity.

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