A. Sinus bradycardia a. often occurs naturally. b. is considered abnormal in athletes. c. is often seen in Wolff–Parkinson–White syndrome. d. is caused by increased sympathetic stimulation. B. Characteristics….
Which of the following rhythms has a constant PR interval for all conducted beats?
A. In 2nd-degree AV heart block, type II,
a. the P waves are all the same.
b. a QRS complex follows each P wave.
c. the pacemaker site is in the AV junction.
d. the ventricular rate is less than 40 beats per minute.
B. Which of the following rhythms has a constant PR interval for all conducted
a. 2nd-degree AV heart block, type I
b. 3rd-degree AV heart block
c. 2nd-degree AV heart block, type II
d. All of the above
C. The difference between 2nd-degree AV heart block, type I, and type
II is that
a. in type I, the PR intervals are progressively longer until a QRS complex
is dropped and the cycle starts over again.
b. the ventricular rate in type II is usually greater than 60 beats per minute.
c. in type II, the P waves appear to march right through the QRS complexes.
d. in type II, there appears to be a pattern to the irregularity.
D. An ECG rhythm that has no correlation between P waves and QRS
is known as (LO 16.5)
a. 1st-degree AV heart block.
b. 2nd-degree AV heart block, type II.
c. 2nd-degree AV heart block, type I.
d. 3rd-degree AV heart block.