A female client is discharged from the hospital after having an episode of heart failure. She’s prescribed daily oral doses of digoxin (Lanoxin) and furosemide (Lasix). Two days later, she tells her community health nurse that she feels weak and frequently feels her heart "flutter. " What action should the nurse take ？（）

A．Tell the client to rest more often.

B．Tell the client to stop taking the digoxin, and call the physiciarn.

C．Call the physician, report the symptoms, and request to draw a blood sample to determine the client’s potassium level.

D．Tell the client to avoid foods that contain caffeine.

急性心肌梗死最常见的心律失常是

A．心房颤动

B．房室传导阻滞

C．室性期前收缩

D．窦房传导阻滞