CMAC EKG Exam with Complete
Solutions
How many electrodes does a 12-lead EKG use? - ANS-10
What is the difference between an echocardiogram and an electrocardiogram? - ANS-
The electrocardiogram is used to record electrical impulses to read the heart's rhythm
and the echocardiogram is used to produce ultrasound images of the heart.
Which of the following is the part of the ECG wave that represents ventricular
contraction? - ANS-QRS complex
Placement at the fourth intercostal space to the left of the sternum is known as which of
the following? - ANS-V2
Atrial depolarization is represented by which of the following? - ANS-ST segment
Each large block of five small squares represents how many seconds on ECG paper. -
ANS-0.2 seconds
Which of the following waves can be found on an electrocardiogram tracing? - ANS-P
Which of the following medical conditions is an EKG meant to diagnose? - ANS-
Heartbeat irregularity
Ventricular depolarization is represented by which of the following? - ANS-QRS
complex
What percentage of recorded EKGs are performed with incorrect placement of the
leads? - ANS-4 percent
Cardiac cells in a resting, negatively charged state are known as which of the following?
- ANS-Polarization
Atrial arrhythmias include which of the following? - ANS-PVC
The ECG wave that represents atrial contraction is which of the following? - ANS-P
wave
What can excessive hair where electrodes are applied cause? - ANS-Wandering
baselines
, Which of the following reflects the electrical impulse of the heart emanating from the
atria? - ANS-P wave
What is an alternative to shaving a patient's chest in order to perform an EKG? - ANS-
Cover the EKG leads with damp gauze.
What can happen if the right and left limb EKG leads are reversed? - ANS-A negative P
and QRS wave coming out of lead I
Which of the following information must be included on an ECG? - ANS-Patient's height
Which of the following is true about a myocardial bridge diagnosed through an EKG? -
ANS-artery is enveloped by a heart muscle.
Which of the following statements is correct regarding an ECG tracing artifact? - ANS-
An interrupted baseline is caused by a patient with a neurological condition.
Which of the following information would be included on an ECG report? - ANS-Patient's
primary language
What part of the heart is known as the pacemaker of the heart? - ANS-The SA node
Which of the following in an EKG may occur if the V1 and V2 electrodes are in a more
superior location? - ANS-Mimic an anterior MI
What leads are considered ( left ) Lateral leads? - ANS-I,aVL
In which leads would you see a positive P wave? - ANS-I,II,aVL,aVF,V4- V6
What is the normal length in PR interval in both seconds and mm? - ANS-0.12 to 0.20
seconds (3-5 mm)
What wave represents ventricular repolarization? - ANS-T wave
What does the Parasympathetic system do to the heart and what receptors are
associated with it? - ANS-Dilation of arteries (cholinergic)
An R-R interval represents what on the EKG? - ANS-One complete cycle
____________ is an irregular rhythm produced by pacemaker activity wandering from
SA node? - ANS-Wandering Pacemaker
What would you typically see on an EKG if a patient had a Bundle Branch Block (BBB)?
- ANS-Wide QRS
Solutions
How many electrodes does a 12-lead EKG use? - ANS-10
What is the difference between an echocardiogram and an electrocardiogram? - ANS-
The electrocardiogram is used to record electrical impulses to read the heart's rhythm
and the echocardiogram is used to produce ultrasound images of the heart.
Which of the following is the part of the ECG wave that represents ventricular
contraction? - ANS-QRS complex
Placement at the fourth intercostal space to the left of the sternum is known as which of
the following? - ANS-V2
Atrial depolarization is represented by which of the following? - ANS-ST segment
Each large block of five small squares represents how many seconds on ECG paper. -
ANS-0.2 seconds
Which of the following waves can be found on an electrocardiogram tracing? - ANS-P
Which of the following medical conditions is an EKG meant to diagnose? - ANS-
Heartbeat irregularity
Ventricular depolarization is represented by which of the following? - ANS-QRS
complex
What percentage of recorded EKGs are performed with incorrect placement of the
leads? - ANS-4 percent
Cardiac cells in a resting, negatively charged state are known as which of the following?
- ANS-Polarization
Atrial arrhythmias include which of the following? - ANS-PVC
The ECG wave that represents atrial contraction is which of the following? - ANS-P
wave
What can excessive hair where electrodes are applied cause? - ANS-Wandering
baselines
, Which of the following reflects the electrical impulse of the heart emanating from the
atria? - ANS-P wave
What is an alternative to shaving a patient's chest in order to perform an EKG? - ANS-
Cover the EKG leads with damp gauze.
What can happen if the right and left limb EKG leads are reversed? - ANS-A negative P
and QRS wave coming out of lead I
Which of the following information must be included on an ECG? - ANS-Patient's height
Which of the following is true about a myocardial bridge diagnosed through an EKG? -
ANS-artery is enveloped by a heart muscle.
Which of the following statements is correct regarding an ECG tracing artifact? - ANS-
An interrupted baseline is caused by a patient with a neurological condition.
Which of the following information would be included on an ECG report? - ANS-Patient's
primary language
What part of the heart is known as the pacemaker of the heart? - ANS-The SA node
Which of the following in an EKG may occur if the V1 and V2 electrodes are in a more
superior location? - ANS-Mimic an anterior MI
What leads are considered ( left ) Lateral leads? - ANS-I,aVL
In which leads would you see a positive P wave? - ANS-I,II,aVL,aVF,V4- V6
What is the normal length in PR interval in both seconds and mm? - ANS-0.12 to 0.20
seconds (3-5 mm)
What wave represents ventricular repolarization? - ANS-T wave
What does the Parasympathetic system do to the heart and what receptors are
associated with it? - ANS-Dilation of arteries (cholinergic)
An R-R interval represents what on the EKG? - ANS-One complete cycle
____________ is an irregular rhythm produced by pacemaker activity wandering from
SA node? - ANS-Wandering Pacemaker
What would you typically see on an EKG if a patient had a Bundle Branch Block (BBB)?
- ANS-Wide QRS
