Normal ECG Flashcards
The P wave represents?
It is positive in what leads?
1) Atrial depolarization
2) I, II, V4-V6, aVF
The PR interval is the span of time from what locations?
What is the range of time?
1) SA Node to ventricular muscle fiber
2) 0.12 to .20 seconds
The QRS complex represents?
What is the duration?
1) Ventricular depolarization
2) 0.05 to 0.10 seconds
ST segments are normally?
ST depressions are usually a sign of?
ST elevations are usually a sign of?
1) Isoelectric
2) Subendocardial ischemia
3) Subepicardial ischemia
The T wave represents?
It is positive in what leads?
1) Ventricular repolarization
2) I, II, V3-V6
The QT duration is the length of?
Ventricular systole
What might elongated PR segment signify?
What might elongated QRS signify?
1) AV block
2) Bundle branch block
What are the best leads for reading p-waves?
II and V1
What HR is considered tachycardia?
Bradycardia?
1) Greater than 100 bpm
2) Less than 60 bpm
What can no P waves be a sign of?
Atrial fibrillation, atrial flutter, junctional tachycardia
An inverted or tall T wave may indicate?
Peaked T wave may indicate?
1) Ischemia
2) Hyperkalemia
What is the duration of a QT interval?
Less than 0.45
