Question 1

Tachycardia in an adult is defined as a heart rate greater then ___ beats per minute,with otherwise normal findings on the ECG.

Accepted Answer

A)   100
B)   125
C)   150
D)   175 A

Question 2

Which of the following is classified as a significant arrhythmia according to the ACC/AHA guidelines?

Accepted Answer

A)   pathologic Q waves
B)   left bundle branch block
C)   high-grade AV block
D)   ST-T wave abnormalities C

Question 3

Which of the following sequences correctly depicts the normal pattern of sequential depolarization of the structures of the heart? 
(1)right and left bundle branches
(2)sinoatrial (SA)node
(3)subendocardial Purkinje network
(4)bundle of His
(5)atrioventricular (AV)node

Accepted Answer

A)   5, 2, 4, 1, 3
B)   2, 5, 4, 1, 3
C)   2, 3, 4, 1, 5
D)   2, 5, 3, 1, 4 B

Question 4

Which of the following is an advantage of implantable cardioverter-defibrillators (ICDs)in contrast to pacemakers?

Accepted Answer

A)   ICDs generally are smaller than pacemakers.
B)   ICDs are capable of providing antitachycardia pacing (ATP)  and ventricular bradycardia pacing, while pacemakers are not capable of providing such pacing.
C)   ICDs have batteries that last much longer than pacemakers.
D)   ICDs do not require antibiotic prophylaxis prior to dental treatment whereas pacemakers do.

Question 5

If a vasoconstrictor in local anesthetic is deemed necessary,patients in the low to intermediate risk category and those taking nonselective beta blockers can safely be given up to ____ cartridge(s)containing 1:100,000 epinephrine.

Accepted Answer

A)   one
B)   two
C)   three
D)   zero-epinephrine is an absolute contraindication

Question 6

Which of the following is the most common type of persistent arrhythmia?

Accepted Answer

A)   sinus arrhythmia
B)   premature atrial complexes
C)   atrial fibrillation
D)   ventricular flutter and fibrillation

Question 7

Which of the following dental devices has produced electromagnetic interference (EMI)with pacemakers and ICDs in studies performed in vitro?

Accepted Answer

A)   battery-operated curing lights
B)   electrical pulp testers and apex locators
C)   handpieces
D)   electric toothbrushes

Question 8

Which of the following is a disorder of repolarization?

Accepted Answer

A)   Mobitz type I (Wenckebach) 
B)   Wolff-Parkinson-White syndrome
C)   long QT syndrome
D)   torsades de pointes

Exam 5: Cardiac Arrhythmias

Tachycardia in an adult is defined as a heart rate greater then ___ beats per minute,with otherwise normal findings on the ECG.

Which of the following is classified as a significant arrhythmia according to the ACC/AHA guidelines?

Which of the following sequences correctly depicts the normal pattern of sequential depolarization of the structures of the heart? (1) right and left bundle branches (2) sinoatrial (SA) node (3) subendocardial Purkinje network (4) bundle of His (5) atrioventricular (AV) node

Which of the following is an advantage of implantable cardioverter-defibrillators (ICDs) in contrast to pacemakers?

If a vasoconstrictor in local anesthetic is deemed necessary,patients in the low to intermediate risk category and those taking nonselective beta blockers can safely be given up to ____ cartridge(s) containing 1:100,000 epinephrine.

Which of the following is the most common type of persistent arrhythmia?

Which of the following dental devices has produced electromagnetic interference (EMI) with pacemakers and ICDs in studies performed in vitro?

Which of the following is a disorder of repolarization?