A client is brought to the emergency department suspected of overdosing on imipramine (Tofranil). Which is the nurse's priority assessment?

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Imipramine is a tricyclic antidepressant that can cause significant cardiac toxicity. The nurse's priority assessment should be to monitor the client's cardiac function, including vital signs, heart rate, rhythm, and ECG. The client may develop ECG changes, such as prolongation of the QRS interval, which can progress to ventricular arrhythmias and cardiac arrest.

A Client Is Brought to the Emergency Department Suspected of Overdosing