ECG Lead System Exam 2026 Questions
and Answers
Electrocardiogram (ECG) - Correct answer-Since you can't see the heart beating
we use a ECG to provide a picture that replicates the actual cardiac issue.
Myocardial Infraction (MI) - Correct answer-Heart Attack
-Have abnormal rhythms.
-Death of cardiac muscle due to ischemia
Doe the ECG machine monitor or control the hearts rhythm? - Correct answer-
Only monitors
Straight line when machine is turned on but not connected to the patient - Correct
answer-Isoelectric = no current
It is straight because there is a balanced electrical force field. This Isoelectric line
acts as a starting point for the patterns to be displayed
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,ECG Pattern - Correct answer-Upward Pattern: electricity flowing from the heart
to the electrodes moving to the positive electrode
Downward Pattern: electricity flowing from the heart to the electrodes moving
away from the positive electrode
Where should you put electrodes ? - Correct answer-1. Close to bone
2. Over soft tissue
Where should you NOT put electrodes - Correct answer-1. Thick muscles
2. Skin Folds
3. Bony prominence's
they can cause ECG artifacts that take away from the reading
Leads - Correct answer-recordings of heart activity from several angles around the
heart
(like adjusting the view for your camera)
Lead 1 - Correct answer-right arm (-) to left arm (+)
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, -positive deflection of ECG tracings
-helpful in monitoring atrial rhythms and hemi blocks
Lead 11 - Correct answer-right arm (-) to below the last left palpable rib, below the
midclavicular line(+)
-primary lead
-also positive deflection
-current travels down and to the left following normal condition system of the heart
-info about inferior portion of the heart
-useful for detecting sinus node (SA) and atrial arrhythmias
Lead 111 - Correct answer-left arm (-) left leg (+)
-also positive deflection
-also detects changes associated with an inferior wall myocardial infraction
Modified Chest Lead (MCL1) - Correct answer-Left upper chest (-) to Right Side
of the sternum @ 4th inter coastal space (+) and Ground on the right upper chest
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and Answers
Electrocardiogram (ECG) - Correct answer-Since you can't see the heart beating
we use a ECG to provide a picture that replicates the actual cardiac issue.
Myocardial Infraction (MI) - Correct answer-Heart Attack
-Have abnormal rhythms.
-Death of cardiac muscle due to ischemia
Doe the ECG machine monitor or control the hearts rhythm? - Correct answer-
Only monitors
Straight line when machine is turned on but not connected to the patient - Correct
answer-Isoelectric = no current
It is straight because there is a balanced electrical force field. This Isoelectric line
acts as a starting point for the patterns to be displayed
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,ECG Pattern - Correct answer-Upward Pattern: electricity flowing from the heart
to the electrodes moving to the positive electrode
Downward Pattern: electricity flowing from the heart to the electrodes moving
away from the positive electrode
Where should you put electrodes ? - Correct answer-1. Close to bone
2. Over soft tissue
Where should you NOT put electrodes - Correct answer-1. Thick muscles
2. Skin Folds
3. Bony prominence's
they can cause ECG artifacts that take away from the reading
Leads - Correct answer-recordings of heart activity from several angles around the
heart
(like adjusting the view for your camera)
Lead 1 - Correct answer-right arm (-) to left arm (+)
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, -positive deflection of ECG tracings
-helpful in monitoring atrial rhythms and hemi blocks
Lead 11 - Correct answer-right arm (-) to below the last left palpable rib, below the
midclavicular line(+)
-primary lead
-also positive deflection
-current travels down and to the left following normal condition system of the heart
-info about inferior portion of the heart
-useful for detecting sinus node (SA) and atrial arrhythmias
Lead 111 - Correct answer-left arm (-) left leg (+)
-also positive deflection
-also detects changes associated with an inferior wall myocardial infraction
Modified Chest Lead (MCL1) - Correct answer-Left upper chest (-) to Right Side
of the sternum @ 4th inter coastal space (+) and Ground on the right upper chest
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
