A.  Which rhythm may be preceded by an inverted P9 wave?

a. Atrial flutter

b. Junctional escape rhythm

c. Atrial tachycardia

d. Idioventricular rhythm

B. Match the following types of PJCs with the correct description.

C. In junctional escape rhythm, the pacemaker site is in the

a. SA node.

b. atrial and internodal conduction pathways.

c. AV junction.

d. bundle of His.

D. Accelerated junctional rhythm

a. is regularly irregular.

b. has upright P9 waves in all leads.

c. has normal P9R intervals.

d. has normal QRS complexes.