Final answer:
Elective electrical cardioversion is the procedure used to treat a client with an atrial dysrhythmia. It involves delivering a controlled electric shock to restore normal sinus rhythm.
Step-by-step explanation:
For a client diagnosed with an atrial dysrhythmia, the procedure commonly used to treat this condition is Elective electrical cardioversion. This procedure involves delivering a controlled electric shock to the heart to restore normal sinus rhythm. It is typically performed under sedation or anesthesia, and the patient's heart rhythm is closely monitored throughout the process. Chemical cardioversion, on the other hand, involves the use of medications to restore normal rhythm.