Cardiology 101 - ECG
Basics Solved
Questions with Clear
Explanations Included
What is an ECG? - answer A graphic representation of the electrical
activity in the heart's conduction system over time.
The ECG is not a representation of mechanical activity in the heart
Electrodes are placed on the patient to evaluate the electrical
activity of the heart
ECG Anatomy - answer P-Wave: Atrial depolarization- atria
contraction
PR Interval: under the wave, the time from the start of the p-wave
to the start of the QRS
PR Segment: end of the P-wave to the beginning of the QRS
QRS Complex: Ventricular depolarization - ventricular contraction
QT Interval: beginning of the QRS to the end of the T-wave
ST Segment: The end of the S to the beginning of the T
T-Wave: Ventricular Repolarization
Wave - answer Positive or negative deflection
ex: P, Q, R, S, T
, Interval - answer The time between two specific ECG events
ex: PR, QRS, AT, RR
Segment - answer The length between two specific points on an ECG
that are supposed to be at the baseline amplitude
ex: PR, ST segments
Complex - answer The combination of multiple waves grouped
together
J Point - answer Where the QRS complex ends and the ST segment
begins
What is the average duration of the P complex - answer 100 ms
What is the average duration of the PR Interval - answer 120-200 ms
What is the average duration of the QRS Complex? - answer 80-100
ms
What is the average duration of the T complex? - answer 150 ms
What is the average duration of the QT Interval? - answer 380 ms
P- Wave - answer Represents atrial depolarization. The P- wave
occurs when the SA node makes an action potential that depolarizes
the atria.
An ECG representation of a P-wave - answer The ECG represents a
normal sinus rhythm (NSR). Each P-wave should be followed by a
Basics Solved
Questions with Clear
Explanations Included
What is an ECG? - answer A graphic representation of the electrical
activity in the heart's conduction system over time.
The ECG is not a representation of mechanical activity in the heart
Electrodes are placed on the patient to evaluate the electrical
activity of the heart
ECG Anatomy - answer P-Wave: Atrial depolarization- atria
contraction
PR Interval: under the wave, the time from the start of the p-wave
to the start of the QRS
PR Segment: end of the P-wave to the beginning of the QRS
QRS Complex: Ventricular depolarization - ventricular contraction
QT Interval: beginning of the QRS to the end of the T-wave
ST Segment: The end of the S to the beginning of the T
T-Wave: Ventricular Repolarization
Wave - answer Positive or negative deflection
ex: P, Q, R, S, T
, Interval - answer The time between two specific ECG events
ex: PR, QRS, AT, RR
Segment - answer The length between two specific points on an ECG
that are supposed to be at the baseline amplitude
ex: PR, ST segments
Complex - answer The combination of multiple waves grouped
together
J Point - answer Where the QRS complex ends and the ST segment
begins
What is the average duration of the P complex - answer 100 ms
What is the average duration of the PR Interval - answer 120-200 ms
What is the average duration of the QRS Complex? - answer 80-100
ms
What is the average duration of the T complex? - answer 150 ms
What is the average duration of the QT Interval? - answer 380 ms
P- Wave - answer Represents atrial depolarization. The P- wave
occurs when the SA node makes an action potential that depolarizes
the atria.
An ECG representation of a P-wave - answer The ECG represents a
normal sinus rhythm (NSR). Each P-wave should be followed by a
