Exam 1 ECGs

Question 1

Two generic ways to stop a tachyarrhythmia?

Answer 1

1) suppress depolarization

2) prolong repolarization

Question 2

Which class of antiarrhythmias is not effective against ventricular tachycardias?

Answer 2

Class IV (Ca channel blockers)

Question 3

For which species will a class I (Na channel blocker) antiarrhythmic help treat supraventricular tachycardias?

Answer 3

horse (will not work for dogs)

Question 4

Name 2 Class Ia antiarrhythmics

Answer 4

Quinidine

Procainamide

Question 5

Name 2 (one oral, one IV) class Ib antiarrhythmics

Answer 5

IV–Lidocaine

PO–Mexiletine

Question 6

Name 2 (one oral, one IV) class II antiarrhythmics

Answer 6

Atenolol (IV)

Esmolol (PO)

Question 7

Name 2 class III antiarrhythmics

Answer 7

Amiodarone (last choice…blocks ALL channels)

Sotalol (also beta-blocker)

Question 8

Name a class IV antiarrhythmic

Answer 8

Diltiazem

Question 9

Name one injectable and 2 oral medications that can be used to treat Vtach

Answer 9

IV–Lidocaine

Oral–Sotalol, Mexiletine

Question 10

Name 1 injectable and 3 oral meds that can be used to treat atrial fibrilation

Answer 10

IV–Diltiazem

Oral– Diltiazem, Sotalol, Digoxin

Question 11

3 ECG changes expected with hyperkalemia?

Answer 11

1) loss of p waves
2) taller T wave
3) increased QRS width

Question 12

Primary cause of left anterior fasicular block?

Answer 12

Left ventricle concentric hypertrophy