cardiac apex-obtaining ECG Question
and answers correctly solved
2026/2027
What is an ECG? - correct answer electrocardiogram is a recording of the hearts electrical activity from
various angles or leads, and on various sized paper
what does normal ECG waveform look like? - correct answer in waveform, development, the speed at
which the electrical waveform moves across the myocardium during atrial and ventricular contraction
(depolarization) and relaxation (repolarization) determines the type and size of the deflection recorded
on an ECG.
What are some wave types? - correct answer P wave, QRS, and T wave
What is P wave? - correct answer represents atrial depolarization as electrical impulses conduct through
the atria in ring-like waves from the SA node. appears on ECG as smaller, rounded deflection.
- represents electrical depolarization of the atria normal P waves do not exceed 2.5mm in amplitude and
are usually wide.
What is QRS wave? - correct answer represents the centricular depolarization as conduction reaches
the larger ventricular pathway through the bundle branches and purkinje fibers. appears on ECG as
rapid, large spike deflection, the stimulation atrial repolarization waveform is buries in the QRS and not
seen.
What is T wave? - correct answer represents the ventricular repolarization or relaxation. appears of ECG
as larger, rounded deflection.
Voltage is _________, time is ________ - correct answer voltage is vertical, time is horizontal
, why is the size is ECG paper so important? - correct answer to understand the ECG heart rate, intervals,
waveforms, and other specifics of the cardiac cycle.
How is voltage measured? - correct answer vertically in millimeters (mm). the small square is 1mm, and
the large square is 5mm of voltage
How is time measured? - correct answer time is recorded horizontally in seconds. the small square is
0.04 seconds and the large is 0.2 seconds of time.
How do you remember the height or voltage component of the ECG tracing in graph paper? - correct
answer consider each small block as a one story house, if you stack 5 houses on top of one another, it
wouls be the size of a 5 story apartment (or one large block)
how do you remember the time or width component of the ECG tracing in graph paper? - correct
answer consider each small block a car, 5 cars would take up as much as a semi truck
what is deflection? - correct answer as depolarization moves across the myocardium, the electrical
impulse is detected by electrodes placed on the skin.
what is a positively deflected waveform? - correct answer when a wave of electrical activity moves
toward a positive electrode and produces a positive deflection on the ECG tracing
what is a negatively deflected waveform? - correct answer when a wave of electrical activity moves
away from a positive electrode producing a negative deflection on the ECG tracing.
what is a biphasic waveform? - correct answer when a wave of electrical activity moves at right angles
(perpendicular) to a positive electrode and produces a biphasic waveform, one that is equally positive
and negative.
and answers correctly solved
2026/2027
What is an ECG? - correct answer electrocardiogram is a recording of the hearts electrical activity from
various angles or leads, and on various sized paper
what does normal ECG waveform look like? - correct answer in waveform, development, the speed at
which the electrical waveform moves across the myocardium during atrial and ventricular contraction
(depolarization) and relaxation (repolarization) determines the type and size of the deflection recorded
on an ECG.
What are some wave types? - correct answer P wave, QRS, and T wave
What is P wave? - correct answer represents atrial depolarization as electrical impulses conduct through
the atria in ring-like waves from the SA node. appears on ECG as smaller, rounded deflection.
- represents electrical depolarization of the atria normal P waves do not exceed 2.5mm in amplitude and
are usually wide.
What is QRS wave? - correct answer represents the centricular depolarization as conduction reaches
the larger ventricular pathway through the bundle branches and purkinje fibers. appears on ECG as
rapid, large spike deflection, the stimulation atrial repolarization waveform is buries in the QRS and not
seen.
What is T wave? - correct answer represents the ventricular repolarization or relaxation. appears of ECG
as larger, rounded deflection.
Voltage is _________, time is ________ - correct answer voltage is vertical, time is horizontal
, why is the size is ECG paper so important? - correct answer to understand the ECG heart rate, intervals,
waveforms, and other specifics of the cardiac cycle.
How is voltage measured? - correct answer vertically in millimeters (mm). the small square is 1mm, and
the large square is 5mm of voltage
How is time measured? - correct answer time is recorded horizontally in seconds. the small square is
0.04 seconds and the large is 0.2 seconds of time.
How do you remember the height or voltage component of the ECG tracing in graph paper? - correct
answer consider each small block as a one story house, if you stack 5 houses on top of one another, it
wouls be the size of a 5 story apartment (or one large block)
how do you remember the time or width component of the ECG tracing in graph paper? - correct
answer consider each small block a car, 5 cars would take up as much as a semi truck
what is deflection? - correct answer as depolarization moves across the myocardium, the electrical
impulse is detected by electrodes placed on the skin.
what is a positively deflected waveform? - correct answer when a wave of electrical activity moves
toward a positive electrode and produces a positive deflection on the ECG tracing
what is a negatively deflected waveform? - correct answer when a wave of electrical activity moves
away from a positive electrode producing a negative deflection on the ECG tracing.
what is a biphasic waveform? - correct answer when a wave of electrical activity moves at right angles
(perpendicular) to a positive electrode and produces a biphasic waveform, one that is equally positive
and negative.
