Cardiac Electrophysiology

Question 1

___ degree block where all atrial impulses reach the ventricle but the PR interval is long

Answer 1

1st degree AV block

Question 2

____ degree block where no impulses are conducted to ventricles, ventricular rate is less than the atrial rate. P wave is not always followed by QRS complex

Answer 2

2nd degree AV block

Question 3

_____ degree block where there is complete dissociation of SA and AV node

Answer 3

3rd degree AV block

Question 4

Hypokalemia is associated with ____ T waves

Answer 4

flat/inverted

With U waves

Question 5

Hyperkalemia is associated with ____ (low, high) P waves and ___ (short, tall) T waves

Answer 5

Low P waves, Tall T waves

Question 6

A prolonged QT interval is associated with ___ electrolyte imbalance

Answer 6

HYPOCalcemia

Question 7

____ node has the slowest conduction velocity

Answer 7

AV node

0.01-0.05 m/sec

Question 8

____ node has the fastest conduction velocity

Answer 8

Purkinje fibers

2-4m/sec

Question 9

SA node AP has an unstable RMP. It contains the following phases ___, ____, ____

Answer 9

4,0,3

Question 10

Digitalis and Digoxin are positive inotropes. They produce changes in ___

Answer 10

contractility

Question 11

Changes in the rate of relaxation is called

Answer 11

lusitropic effect

Question 12

Dromotropes affect the ___ node

Answer 12

AV node