For a client with atrial fibrillation, what should be done regarding the digoxin (Lanoxin) dose if the potassium level is 4.6 mEq/L?

The appropriate action regarding the digoxin dose for a client with atrial fibrillation and a potassium level of 4.6 mEq/L is to administer the dose as prescribed.

Digoxin, a cardiac glycoside, has a narrow therapeutic window and its effectiveness and safety are influenced by potassium levels. In the case of digoxin, potassium levels within the normal range (typically 3.5 to 5.0 mEq/L) indicate that the risk of toxicity is lower, particularly at this level of 4.6 mEq/L. Adequate potassium levels help maintain cardiac function and prevent arrhythmias when digoxin is administered.

If a patient's potassium level were to be abnormally high or low, it might necessitate holding the dose or adjusting it, due to the increased risk of digoxin toxicity or decreased efficacy. However, within the normal range, continuing with the prescribed dose is appropriate and safe, thus allowing for optimal management of atrial fibrillation in this patient.