Basic Cardiac Rhythm Interpretation with Complete Solutions 100% Correct,
2025
P Wave - (ANSWER)Atrial Depolarization stimulated by the firing of the SA node.
Evaluate: consistent appearance and 1:1 relationship with QRS complex.
If not identical some, or all, may be atrial, but not SA node, in origin.
IF >1 P-wave precedes QRS a heart block may be present.
PR Interval - (ANSWER)Impulse traveling time from the atrium to the ventricles.
Measure from the beginning of the P-wave to the beginning of the QRS complex.
Evaluate: Duration & regularity of interval.
你是想要一篇“眼睛容易阅读的”
中文文章，还是一篇关于“眼睛”
If > 0.20 seconds a conduction delay called an AV heart block is present.
主题的中文文章？
QRS complex - (ANSWER)Ventricular Depolarization
Measure from beginning of Q-wave to end of S-wave where it returns to baseline.
Evaluate: all complexes should look alike in the same lead. Normal Duration < 0.12 seconds.
Widening QRS complex suggests bundle branch block or other conduction delay.
, ST segment - (ANSWER)Represents the completion of ventricular depolarization and the
beginning of ventricular repolarization.
Along isoelectric line between the end of the QRS complex and the beginning of the T-wave.
Depressed with myocardial ischemia. Elevated with myocardial infarction.
T-wave - (ANSWER)Ventricular Repolarization
Upstroke = absolute refractory period
Downstroke = relative refractory period
QT Interval - (ANSWER)Length of time it takes for ventricles to depolarize and depolarize.
Measure from beginning of Q-wave to end of T-wave. Should be less than half of the R-R
interval.
Length > 0.50 seconds is considered dangerously prolonged.
你是想要一篇“眼睛容易阅读的”
中文文章，还是一篇关于“眼睛”
R-R Interval - (ANSWER)Represents rate of ventricular depolarization (therefore heart rate).
主题的中文文章？
Evaluate: regularity
Eight Steps of ECG Interpretation - (ANSWER)1. Measure HR
2. Examine R-R Interval (regular or irregular)
3. Examine the P-wave (same configuration)
4. Measure the PR interval (constant <0.20 sec)
5. Determine if each P-wave is followed by a QRS complex
6. Examine and measure the QRS complex (< 0.12 sec)
7. Examine and measure the QT interval (<1/2 R-R)
8. Diagnose the rhythm
2025
P Wave - (ANSWER)Atrial Depolarization stimulated by the firing of the SA node.
Evaluate: consistent appearance and 1:1 relationship with QRS complex.
If not identical some, or all, may be atrial, but not SA node, in origin.
IF >1 P-wave precedes QRS a heart block may be present.
PR Interval - (ANSWER)Impulse traveling time from the atrium to the ventricles.
Measure from the beginning of the P-wave to the beginning of the QRS complex.
Evaluate: Duration & regularity of interval.
你是想要一篇“眼睛容易阅读的”
中文文章，还是一篇关于“眼睛”
If > 0.20 seconds a conduction delay called an AV heart block is present.
主题的中文文章？
QRS complex - (ANSWER)Ventricular Depolarization
Measure from beginning of Q-wave to end of S-wave where it returns to baseline.
Evaluate: all complexes should look alike in the same lead. Normal Duration < 0.12 seconds.
Widening QRS complex suggests bundle branch block or other conduction delay.
, ST segment - (ANSWER)Represents the completion of ventricular depolarization and the
beginning of ventricular repolarization.
Along isoelectric line between the end of the QRS complex and the beginning of the T-wave.
Depressed with myocardial ischemia. Elevated with myocardial infarction.
T-wave - (ANSWER)Ventricular Repolarization
Upstroke = absolute refractory period
Downstroke = relative refractory period
QT Interval - (ANSWER)Length of time it takes for ventricles to depolarize and depolarize.
Measure from beginning of Q-wave to end of T-wave. Should be less than half of the R-R
interval.
Length > 0.50 seconds is considered dangerously prolonged.
你是想要一篇“眼睛容易阅读的”
中文文章，还是一篇关于“眼睛”
R-R Interval - (ANSWER)Represents rate of ventricular depolarization (therefore heart rate).
主题的中文文章？
Evaluate: regularity
Eight Steps of ECG Interpretation - (ANSWER)1. Measure HR
2. Examine R-R Interval (regular or irregular)
3. Examine the P-wave (same configuration)
4. Measure the PR interval (constant <0.20 sec)
5. Determine if each P-wave is followed by a QRS complex
6. Examine and measure the QRS complex (< 0.12 sec)
7. Examine and measure the QT interval (<1/2 R-R)
8. Diagnose the rhythm
