ECG Quiz UPDATED Exam Questions and
CORRECT Answers
p - CORRECT ANSWER - The ___ wave represents atrial depolarization
PR - CORRECT ANSWER - The ___ interval measures the time it takes for the impulse
to depolarize the atria, travel to the AV node, and dwell there briefly before entering the bundle
of His
0.12-0.20 - CORRECT ANSWER - The normal PR interval is _______ seconds, or three
to five small boxes wide
QRS - CORRECT ANSWER - The ____ complex represents ventricular depolarization.
Atrial repolarization also occurs simultaneously to ventricular depolarization, but because of the
larger muscle mass of the ventricles, visualization of atrial repolarization is obscured by the QRS
complex
0.06-0.10 - CORRECT ANSWER - The normal width of the QRS complex is ______
second, or 1.5 to 2.5 small boxes
t - CORRECT ANSWER - The ___ wave represents ventricular repolarization
1. 0.47
2. 0.48 - CORRECT ANSWER - The QT interval (1) in males and (2) in females.
sinus arrest - CORRECT ANSWER - Failure of the SA node to generate an impulse
sinus exit block - CORRECT ANSWER - The impulse from the SA node is blocked and
does not exit from the SA node
, depolarization - CORRECT ANSWER - The end result of sinus arrest or exit block is that
no atrial or ventricular ______ occurs for one heartbeat or more
junctional escape or ventricular escape beats - CORRECT ANSWER - If the pause of a
sinus arrest lasts long enough, the AV node or ventricular backup pacemaker may fire, resulting
in escape beats known as ___________
- CORRECT ANSWER - ________ also results in a pause, but the P wave following the
pause in rhythm is on time or regular because the sinus node does not resent
rate: usually between 60 and 100 but a pause can result in HR less than 60.
regularity: irregular during the period of the pause but regular when sinus rhythm resumes -
CORRECT ANSWER - Sinus Exit Block:
Rate:
Regularity:
premature atrial contractions - CORRECT ANSWER - A single ectopic beat arising from
the atrial tissue, not the sinus node. The P wave has a different shape than the sinus P wave
because it arises from a different area in the atria
non compensatory - CORRECT ANSWER - The pause of a PAC is _______, which
means that when measuring the P-P intervals for atrial regularity, the P wave following the pause
does not occur on time
nonconducted - CORRECT ANSWER - ______ PACs are beats that create an early P
wave but are not followed by a QRS complex
rate: matches underlying rhythm
regularity: PAC interrupts it for a single beat and followed by a noncompensatory pause
interval: PR interval is usually shorter - CORRECT ANSWER - PACs:
rate:
CORRECT Answers
p - CORRECT ANSWER - The ___ wave represents atrial depolarization
PR - CORRECT ANSWER - The ___ interval measures the time it takes for the impulse
to depolarize the atria, travel to the AV node, and dwell there briefly before entering the bundle
of His
0.12-0.20 - CORRECT ANSWER - The normal PR interval is _______ seconds, or three
to five small boxes wide
QRS - CORRECT ANSWER - The ____ complex represents ventricular depolarization.
Atrial repolarization also occurs simultaneously to ventricular depolarization, but because of the
larger muscle mass of the ventricles, visualization of atrial repolarization is obscured by the QRS
complex
0.06-0.10 - CORRECT ANSWER - The normal width of the QRS complex is ______
second, or 1.5 to 2.5 small boxes
t - CORRECT ANSWER - The ___ wave represents ventricular repolarization
1. 0.47
2. 0.48 - CORRECT ANSWER - The QT interval (1) in males and (2) in females.
sinus arrest - CORRECT ANSWER - Failure of the SA node to generate an impulse
sinus exit block - CORRECT ANSWER - The impulse from the SA node is blocked and
does not exit from the SA node
, depolarization - CORRECT ANSWER - The end result of sinus arrest or exit block is that
no atrial or ventricular ______ occurs for one heartbeat or more
junctional escape or ventricular escape beats - CORRECT ANSWER - If the pause of a
sinus arrest lasts long enough, the AV node or ventricular backup pacemaker may fire, resulting
in escape beats known as ___________
- CORRECT ANSWER - ________ also results in a pause, but the P wave following the
pause in rhythm is on time or regular because the sinus node does not resent
rate: usually between 60 and 100 but a pause can result in HR less than 60.
regularity: irregular during the period of the pause but regular when sinus rhythm resumes -
CORRECT ANSWER - Sinus Exit Block:
Rate:
Regularity:
premature atrial contractions - CORRECT ANSWER - A single ectopic beat arising from
the atrial tissue, not the sinus node. The P wave has a different shape than the sinus P wave
because it arises from a different area in the atria
non compensatory - CORRECT ANSWER - The pause of a PAC is _______, which
means that when measuring the P-P intervals for atrial regularity, the P wave following the pause
does not occur on time
nonconducted - CORRECT ANSWER - ______ PACs are beats that create an early P
wave but are not followed by a QRS complex
rate: matches underlying rhythm
regularity: PAC interrupts it for a single beat and followed by a noncompensatory pause
interval: PR interval is usually shorter - CORRECT ANSWER - PACs:
rate:
