Lab 2 Test - ECG Flashcards
an ECG interpretation includes:
an assessment of the morphology (appearance) of the waves and intervals on the ECG curve
ECG interpretation requires:
a structured assessment of the waves and intervals
measurement of ST-segment depression in exercise stress testing
J-60 point
measurement of ST-segment elevation and ST segment depression most instances
J point
the reference level for measuring ST-segment deviation (depression or elevation)
- is not the TP interval
- correct reference level is the PR segment
- this level is also called baseline level or isoelectric level
1
RR interval (distance between R-waves)
2
R
3
R
4
PP interval (distance between P-waves)
5
PR segment
6
ST-T segment
7
TP interval
8
P-wave duration
9
ST segment
10
T
11
U
12
P
13
Q
14
S
15
PR interval
16
Q
17
S
18
QRS duration
19
J-60 point
20
J point
21
QT duration
the P-wave reflects
atrial depolarization (activation)
the PR interval is the distance ____
between the onset of the P-wave to the onset of the QRS complex
why is the PR interval assessed
in order to determine whether impulse conduction from the atria to the ventricles is normal
the flat line between the end of the P-wave and the onset of the QRS complex is called
the PR segment and it reflects the slow impulse conduction through the atrioventricular node
the QRS complex represents ____
the depolarization (activation) of the ventricles
QRS duration is the _____
time interval from the onset to the end of the QRS complex
a _____ QRS complex is desirable as it proves that the ventricles are depolarized rapidly which in turn implies that the conduction system functions properly
short
_____ QRS complexes indicate that ventricular depolarization is show, which may be due to dysfunction in the conduction system
wide (also referred to as broad)
the ST segment corresponds to the _____ of the action potential
plateau (phase 2)
the ____ is of particular interest in the setting of acute myocardial ischemia because ischemia causes deviation of the _______
ST segment
what are the 2 types of ST segment deviations
- ST segment depression: implies that the ST segment is displaced such that it is below the level of the PR segment
- ST segment elevation: implies that the ST segment is displaced such that it is above the level of the PR segment
the T wave reflects _____
the rapid depolarization of contractile cells (phase 3) and T-wave changes occur in a wide range of conditions
the normal T-wave is slightly _____ with a steeper downward slope
asymmetric
the U-wave is a
positive wave occurring after the T-wave
the U-wave is most frequently seen in leads ____
V2-V4
Individuals with prominent T-waves, as well as those with slow heart rates display ____ more often
U-waves
reflects the total duration of ventricular depolarization and repolarization
QT duration
____ is measured from the onset of the QRS complex to the end of the T-wave
QT duration
the heart rate adjusted QT interval is referred to as the ____
corrected QT interval (QTc interval)
a ____ QTc interval increases the risk of ventricular arrhythmias
long
the ____ is a small, positive and smooth wave
P-wave
