A patient has been admitted with a potassium level of 6.8 mEq/L. The nurse would expect which of the following electrocardiogram (ECG) changes as a result of this laboratory value?

Choice A reason:

Administer magnesium sulfate IV. This is correct because magnesium sulfate is the treatment of choice for severe hypomagnesemia. It can rapidly increase the blood level of magnesium and correct the symptoms of deficiency.

Choice B reason:

Monitor the client's blood pressure and heart rate. This is incorrect because monitoring vital signs is not a specific intervention for hypomagnesemia. However, it is important to monitor the client for signs of hypotension and bradycardia, which can occur as adverse effects of magnesium sulfate therapy.

Choice C reason:

Encourage the client to increase intake of green leafy vegetables. This is correct because green leafy vegetables are rich sources of dietary magnesium. Increasing the intake of magnesium-rich foods can help prevent or treat mild hypomagnesemia.

Choice D reason:

Prepare to administer calcium gluconate IV. This is incorrect because calcium gluconate is not indicated for hypomagnesemia. Calcium gluconate is used to treat hypocalcemia, which can occur as a complication of hypomagnesemia. However, calcium gluconate should not be given until the magnesium level is corrected, as low magnesium can impair the response to calcium.

Choice E reason:

Assess the client for Chvostek's sign and Trousseau's sign. This is correct because Chvostek's sign and Trousseau's sign are clinical tests for neuromuscular irritability, which can occur in hypomagnesemia. Chvostek's sign is elicited by tapping the facial nerve in front of the ear and observing for facial twitching. Trousseau's sign is elicited by inflating a blood pressure cuff above the systolic pressure for 3 minutes and observing for carpal spasm.

Choice A reason:

Serum glucose 600 mg/dL. This is an expected finding for a client who has diabetic ketoacidosis (DKA) DKA results from a deficiency of insulin, which leads to hyperglycemia and ketosis. The normal range for serum glucose is 70 to 110 mg/dL.

Choice B reason:

Serum bicarbonate 28 mEq/L. This is not an expected finding for a client who has DKA. A client who has DKA experiences ketosis, which results in ketones in the urine and blood. The nurse should expect a client who has DKA to have an HCO3- less than 15 mEq/L. This decreased value is due to an increased production of ketones, which results in metabolic acidosis. The normal range for serum bicarbonate is 22 to 26 mEq/L.

Choice C reason:

Serum potassium 2.5 mEq/L. This is not an expected finding for a client who has DKA. A client who has DKA experiences osmotic diuresis and subsequent dehydration, which can cause electrolyte imbalances. The nurse should expect a client who has DKA to have elevated serum potassium levels due to the movement of potassium from the intracellular to the extracellular space in response to acidosis. The normal range for serum potassium is 3.5 to 5 mEq/L.

Choice D reason:

Serum sodium 150 mEq/L. This is not an expected finding for a client who has DKA. A client who has DKA experiences osmotic diuresis and subsequent dehydration, which can cause electrolyte imbalances. The nurse should expect a client who has DKA to have decreased serum sodium levels due to the dilutional effect of excess glucose in the blood. The normal range for serum sodium is 136 to 145 mEq/L.