What is the first action a nurse should take when assessing a client with suspected digitalis toxicity?

Establishing continuous cardiac monitoring is the first critical action when assessing a client with suspected digitalis toxicity due to the potential for significant cardiac effects associated with this condition. Digitalis toxicity can lead to arrhythmias, bradycardia, or other dangerous heart rate irregularities, which may be life-threatening. By initiating continuous monitoring, the nurse can promptly identify any changes in the client's heart rate or rhythm, allowing for immediate intervention if necessary.

Other actions, while potentially important in the overall management of the patient, do not prioritize the immediate need to monitor cardiac function. Applying a cool compress or prescribing acetaminophen addresses symptoms like fever or discomfort but does not directly address the risk of cardiac complications associated with digitalis toxicity. Obtaining a complete metabolic panel is essential for assessing electrolyte imbalances that can also occur with toxicity, but this can follow the establishment of cardiac monitoring to ensure that the client remains stable throughout the assessment process.