Basic Cardiac Rhythm Interpretation – Questions With
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Terms in this set (36)
P Wave 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 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.
If > 0.20 seconds a conduction delay called an AV heart block
is present.
, QRS complex 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 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 Ventricular Repolarization
Upstroke = absolute refractory period
Downstroke = relative refractory period
QT Interval 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.
R-R Interval Represents rate of ventricular depolarization (therefore heart
rate).
Evaluate: regularity
Reviewed Solutions
Save
Students also studied
Chapter 29- Chest and Abdominal Tr... Chapter 21 Test Ch. 22 Study Guide
348 terms 24 terms 32 terms
anaphylacticshock Preview kenanderson2017 Preview Kendall_Dinning
Terms in this set (36)
P Wave 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 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.
If > 0.20 seconds a conduction delay called an AV heart block
is present.
, QRS complex 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 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 Ventricular Repolarization
Upstroke = absolute refractory period
Downstroke = relative refractory period
QT Interval 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.
R-R Interval Represents rate of ventricular depolarization (therefore heart
rate).
Evaluate: regularity
