BCIT CARD 2202 - Final Exam
Which lead is the ground lead? correct answersRight leg
Who wrote a popular eletrocardiography textbook based on Willem
Einthoven's findings? correct answersThomas Lewis
Who demonstrated the first human ECG? correct answersAugustus
Waller
The midpoint of the axis of the unipolar lead, found at the center of the
heart, has what polarity? correct answersZero potential
The 12 lead ECG consists of augmented leads, standard leads and
unipolar leads. correct answers3 3 6
precordial leads correct answersSix EKG leads placed on the anterior chest
to record electrical activity of the heart, mainly the electrical impulses
originating in the ventricles or the heart's anterior wall
Einthoven's Law correct answersLead 1 + Lead 3 = Lead 2
If interference is found on lead II and III, the sensor on which limb is likely
the source of interference? correct answersLeft leg
The following are roles of the cardiology technologist with
respect to electrocardiography? correct answers1)
Recognize and eliminate
artifacts. 2)
Prepare patient for recording
procedure. 3)
Maintain and conduct minor repairs of the
electrocardiograph. 4)
Be knowledgeable in all the various recording
techniques. 5)
Accurately place all leads for recording an
electrocardiogram.
The purpose of the ground lead is to keep the average voltage of the
patient the same as that of the recording instrument. correct answersTrue
The electrocardiogram consists of 12 leads grouped as follows: correct
answers3 standard bi-polar limb leads
3 augmented limb leads
6 unipolar pre-cordial or chest leads
, Standard Limb leads correct answersLeads I, II, II are also known as bi-polar
leads, as each lead uses two of the three active sensors.
Right arm lead correct answersnegative in
lead 1 negative in lead 2
left arm lead correct answerspositive in
lead 1 negative in lead 3
left leg lead correct answerspositive in
lead 2 positive in lead 3
Unipolar Precordial Leads correct answersThe three unipolar limb leads are
designated AVR, AVL and AVF.
Unipolar because each specific lead represents the heart's electrical
forces recorded from that specific limb's electrode.
Hexaxial reference system
chest leads (precordial leads) correct answersV1, V2, V3, V4, V5, V6
record the difference in potential between the chest and the neutral
(zero) reference.
Modern electrocardiograph machines typically: correct answersbased on
digital technology for more accurate and precise information, as well as
faster and easier transmission and storage of data.
Voltage correct answersThe potential energy of a charge due to an
electric field.
Electrically sensitive patient correct answersA patient that has a direct
communication to their heart to the outside.
Electrical current correct answersThe flow of electrons through a
conductor when a difference in electrical potential exists between two
points.
Direct current correct answersThe flow of electrons in one direction.
Alternating current correct answersThe cyclical flow of electrons that
alternate back and forth.
Analog recordings are measured in and of a second
correct answersMillimeters / hundredths
The prong that returns leakage current from an instrument to the building
ground is the: correct answersground prong
Which lead is the ground lead? correct answersRight leg
Who wrote a popular eletrocardiography textbook based on Willem
Einthoven's findings? correct answersThomas Lewis
Who demonstrated the first human ECG? correct answersAugustus
Waller
The midpoint of the axis of the unipolar lead, found at the center of the
heart, has what polarity? correct answersZero potential
The 12 lead ECG consists of augmented leads, standard leads and
unipolar leads. correct answers3 3 6
precordial leads correct answersSix EKG leads placed on the anterior chest
to record electrical activity of the heart, mainly the electrical impulses
originating in the ventricles or the heart's anterior wall
Einthoven's Law correct answersLead 1 + Lead 3 = Lead 2
If interference is found on lead II and III, the sensor on which limb is likely
the source of interference? correct answersLeft leg
The following are roles of the cardiology technologist with
respect to electrocardiography? correct answers1)
Recognize and eliminate
artifacts. 2)
Prepare patient for recording
procedure. 3)
Maintain and conduct minor repairs of the
electrocardiograph. 4)
Be knowledgeable in all the various recording
techniques. 5)
Accurately place all leads for recording an
electrocardiogram.
The purpose of the ground lead is to keep the average voltage of the
patient the same as that of the recording instrument. correct answersTrue
The electrocardiogram consists of 12 leads grouped as follows: correct
answers3 standard bi-polar limb leads
3 augmented limb leads
6 unipolar pre-cordial or chest leads
, Standard Limb leads correct answersLeads I, II, II are also known as bi-polar
leads, as each lead uses two of the three active sensors.
Right arm lead correct answersnegative in
lead 1 negative in lead 2
left arm lead correct answerspositive in
lead 1 negative in lead 3
left leg lead correct answerspositive in
lead 2 positive in lead 3
Unipolar Precordial Leads correct answersThe three unipolar limb leads are
designated AVR, AVL and AVF.
Unipolar because each specific lead represents the heart's electrical
forces recorded from that specific limb's electrode.
Hexaxial reference system
chest leads (precordial leads) correct answersV1, V2, V3, V4, V5, V6
record the difference in potential between the chest and the neutral
(zero) reference.
Modern electrocardiograph machines typically: correct answersbased on
digital technology for more accurate and precise information, as well as
faster and easier transmission and storage of data.
Voltage correct answersThe potential energy of a charge due to an
electric field.
Electrically sensitive patient correct answersA patient that has a direct
communication to their heart to the outside.
Electrical current correct answersThe flow of electrons through a
conductor when a difference in electrical potential exists between two
points.
Direct current correct answersThe flow of electrons in one direction.
Alternating current correct answersThe cyclical flow of electrons that
alternate back and forth.
Analog recordings are measured in and of a second
correct answersMillimeters / hundredths
The prong that returns leakage current from an instrument to the building
ground is the: correct answersground prong
