Question 13 Which of the following drugs increase the PR interval in an ECG and why? O a. Quinidine because of blocking muscarinic receptors in AV node O b. Propranolol because

of blocking B-receptors in SA node O c. Digoxin because of its indirect cholinergic activity O d. Lidocaine because of blocking sodium channels in nodal tissues Oe. Procainamide because of blocking muscarinic receptors in AV node A Moving to another question will save this response. 0.5 points Save Answer Question 13 of 90 >>>