A nurse is caring for a client who develops the rhythm below. The client is unresponsive, pulseless, and apneic. Which of the following actions should the nurse expect to do first?

A) Sodium 136 mEq/L:
A sodium level of 136 mEq/L is within the normal reference range of 135–145 mEq/L. While clients with heart failure may experience fluid shifts and altered sodium levels, this result does not immediately require reporting to the provider. Sodium at this level is considered normal.

B) Potassium 4.5 mEq/L:
A potassium level of 4.5 mEq/L is within the normal range of 3.5–5.0 mEq/L, making it a safe and appropriate level. There is no immediate concern regarding potassium levels here, so no action is required. This value does not need to be reported to the provider.

C) Calcium 10 mg/dL:
The normal range for calcium is generally between 8.5–10.5 mg/dL. A calcium level of 10 mg/dL is within this normal range, so this finding does not require further action. No reporting is necessary to the provider.

D) Potassium 2.9 mEq/L:
A potassium level of 2.9 mEq/L is below the normal range (3.5–5.0 mEq/L) and is considered hypokalemia. Furosemide is a loop diuretic that can cause potassium depletion by increasing renal excretion of potassium. This is a serious concern because hypokalemia can lead to dangerous cardiac arrhythmias, muscle weakness, and other complications. The nurse should immediately report this low potassium level to the provider so that potassium supplementation or adjustments in diuretic therapy can be made.

A) Jaundice:
Carbidopa-levodopa works by increasing dopamine levels in the brain to help alleviate symptoms of Parkinson's disease, but it is not typically associated with liver dysfunction that would lead to jaundice. If jaundice were to occur, it could indicate liver problems, which would need to be evaluated further, but this is not a typical side effect of Sinemet.

B) Hyperglycemia:
Sinemet primarily affects dopamine levels in the brain and does not have a direct impact on blood sugar regulation. However, long-term use of certain medications, especially corticosteroids or other specific treatments, can affect glucose levels, but carbidopa-levodopa is not typically linked to hyperglycemia.

C) Hypertension:

Carbidopa-levodopa may lead to fluctuations in blood pressure, including lowering blood pressure, especially when the patient is changing positions. However, hypertension is not a typical response to this medication. Instead, patients may experience orthostatic hypotension, which is more common with carbidopa-levodopa.

D) Orthostatic hypotension:
Orthostatic hypotension is a well-recognized and common side effect of carbidopa-levodopa. This occurs because Sinemet affects the autonomic nervous system, which can cause a decrease in blood pressure when moving from a sitting or lying position to standing. Patients on carbidopa-levodopa should be advised to rise slowly to minimize the risk of dizziness or fainting due to orthostatic hypotension.