A client with a stable blood pressure and no symptoms has the following ECG characteristics: atrial rate, 74 beats/minute and regular; ventricular rate, 62 beats/minute and irregular; P wave, normal...

A client with a stable blood pressure and no symptoms has the following ECG characteristics: atrial rate, 74 beats/minute and regular; ventricular rate, 62 beats/minute and irregular; P wave, normal contour; PR interval, lengthens progressively until a P wave is not conducted; QRS complex, normal contour. What would be the appropriate treatment for this rhythm?

a. Epinephrine, 1 mg IV push

b. Isoproterenol, IV continuous drip

c. Immediate insertion of a temporary pacemaker

d. Careful observation for signs of further heart block