BRAINSCAPE1
EKG HOAG Exam with complete
solutions latest version
Normal QSR interval - CORRECT ANSWER-0.04-0.12 seconds
Normal PR interval - CORRECT ANSWER-0.12-0.20 seconds
Normal QT interval - CORRECT ANSWER-0.36-0.44
one small box - CORRECT ANSWER-0.04 seconds
one large box - CORRECT ANSWER-0.20 seconds
Six second tracing method - CORRECT ANSWER-Count number of R waves that
appear within that 6 second period and multiply it by 10
The 300 method - CORRECT ANSWER-use the number 300 divided by the number of
big boxes between R waves
The 1500 method - CORRECT ANSWER-Count number of small squares between two
consecutive R-waves and divide that number by 1500, it is the most accurate method of
obtaining the heart rate but can only be used on regular rhythms.
P wave - CORRECT ANSWER-atrial depolarization (contraction)
QRS wave complex - CORRECT ANSWER-ventricular depolarization
Q wave - CORRECT ANSWER-first negative deflection after P wave
R wave - CORRECT ANSWER-first positive deflection after P wave
S wave - CORRECT ANSWER-first negative deflection after R wave
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T wave - CORRECT ANSWER-ventricular repolarization (relaxation)
ST segment - CORRECT ANSWER-not measured; elevated or depressed
QT interval - CORRECT ANSWER-beginning of QRS complex to end of T wave
cardiac conduction - CORRECT ANSWER-SA node, AV node, Bundle of His, Purkinje
fibers
SA Node damaged or impaired - CORRECT ANSWER-AV node will initiate an electrical
impulse at 40-60bpm
AV Node damaged or impaired - CORRECT ANSWER-Purkinje fibers will initiate
electrical impulse at 20-40 bpm
premature ventricular contraction (PVC) - CORRECT ANSWER-a ventricular
contraction preceding the normal impulse initiated by the SA node (pacemaker)
Ventricular Tachycardia (V-Tach) - CORRECT ANSWER-QRS complexes appear
abnormally wide and bizarre; monomorphic; rate of 110-250bpm; 3 or some consecutive
PVCs are present at rate of > 100bpm;
Rate: Fast
Regularity: Regular
P-waves: Absent
PRI: n/a
QSR: Wide
ventricular fibrillation - CORRECT ANSWER-the rapid, irregular, and useless
contractions of the ventricles; no QRS complexes; no cardiac output; no pulse present
(=DEAD)
Asystole - CORRECT ANSWER-absence of contractions of the heart; P waves may be
present but no QRS
Idioventricular Escape/Agonal - CORRECT ANSWER-Wide, irregular QRS with
prolonged intervals; heart rate slow; no visible P waves
Premature Junctional Contraction - CORRECT ANSWER-Inverted p wave or hidden p
wave
PRI<0.12 or none
Normal QRS
Junctional Rhythm - CORRECT ANSWER-the SA node is nonfunctional, P waves are
absent, and heart is paced by the AV node at 40-60 beats/min
BRAINSCAPE1
EKG HOAG Exam with complete
solutions latest version
Normal QSR interval - CORRECT ANSWER-0.04-0.12 seconds
Normal PR interval - CORRECT ANSWER-0.12-0.20 seconds
Normal QT interval - CORRECT ANSWER-0.36-0.44
one small box - CORRECT ANSWER-0.04 seconds
one large box - CORRECT ANSWER-0.20 seconds
Six second tracing method - CORRECT ANSWER-Count number of R waves that
appear within that 6 second period and multiply it by 10
The 300 method - CORRECT ANSWER-use the number 300 divided by the number of
big boxes between R waves
The 1500 method - CORRECT ANSWER-Count number of small squares between two
consecutive R-waves and divide that number by 1500, it is the most accurate method of
obtaining the heart rate but can only be used on regular rhythms.
P wave - CORRECT ANSWER-atrial depolarization (contraction)
QRS wave complex - CORRECT ANSWER-ventricular depolarization
Q wave - CORRECT ANSWER-first negative deflection after P wave
R wave - CORRECT ANSWER-first positive deflection after P wave
S wave - CORRECT ANSWER-first negative deflection after R wave
BRAINSCAPE1
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T wave - CORRECT ANSWER-ventricular repolarization (relaxation)
ST segment - CORRECT ANSWER-not measured; elevated or depressed
QT interval - CORRECT ANSWER-beginning of QRS complex to end of T wave
cardiac conduction - CORRECT ANSWER-SA node, AV node, Bundle of His, Purkinje
fibers
SA Node damaged or impaired - CORRECT ANSWER-AV node will initiate an electrical
impulse at 40-60bpm
AV Node damaged or impaired - CORRECT ANSWER-Purkinje fibers will initiate
electrical impulse at 20-40 bpm
premature ventricular contraction (PVC) - CORRECT ANSWER-a ventricular
contraction preceding the normal impulse initiated by the SA node (pacemaker)
Ventricular Tachycardia (V-Tach) - CORRECT ANSWER-QRS complexes appear
abnormally wide and bizarre; monomorphic; rate of 110-250bpm; 3 or some consecutive
PVCs are present at rate of > 100bpm;
Rate: Fast
Regularity: Regular
P-waves: Absent
PRI: n/a
QSR: Wide
ventricular fibrillation - CORRECT ANSWER-the rapid, irregular, and useless
contractions of the ventricles; no QRS complexes; no cardiac output; no pulse present
(=DEAD)
Asystole - CORRECT ANSWER-absence of contractions of the heart; P waves may be
present but no QRS
Idioventricular Escape/Agonal - CORRECT ANSWER-Wide, irregular QRS with
prolonged intervals; heart rate slow; no visible P waves
Premature Junctional Contraction - CORRECT ANSWER-Inverted p wave or hidden p
wave
PRI<0.12 or none
Normal QRS
Junctional Rhythm - CORRECT ANSWER-the SA node is nonfunctional, P waves are
absent, and heart is paced by the AV node at 40-60 beats/min
BRAINSCAPE1
