kk Flashcards
(26 cards)
What does ECG stand for?
Electrocardiogram
True or False: The P wave represents atrial depolarization.
True
What is the normal duration of the PR interval?
0.12 to 0.20 seconds
Fill in the blank: The QRS complex represents __________.
ventricular depolarization
What is the typical duration of a QRS complex?
0.06 to 0.10 seconds
Multiple Choice: Which interval measures the time from the beginning of atrial depolarization to the beginning of ventricular depolarization?
PR interval
What does the ST segment represent?
The period between ventricular depolarization and repolarization
True or False: The T wave represents ventricular repolarization.
True
What is the normal duration of the QT interval?
0.35 to 0.45 seconds
Fill in the blank: An elongated QT interval can increase the risk of __________.
arrhythmias
What is the significance of the R-R interval?
It is used to determine heart rate.
Multiple Choice: Which wave indicates atrial repolarization?
It is not represented on the ECG.
What does the term ‘heart rate’ refer to in ECG interpretation?
The number of beats per minute.
True or False: The isoelectric line represents zero electrical activity.
True
What is the standard paper speed for an ECG machine?
25 mm/sec
Fill in the blank: The __________ interval is measured from the start of one QRS complex to the start of the next.
R-R
What is the purpose of measuring the QTc interval?
To correct the QT interval for heart rate.
Multiple Choice: Which of the following is NOT a component of the ECG waveform?
U wave
What does a prolonged PR interval indicate?
Atrioventricular block
True or False: The U wave is always present in an ECG.
False
What is the relationship between heart rate and the R-R interval?
Inversely proportional
Fill in the blank: The __________ segment is crucial for identifying myocardial ischemia.
ST
What is the effect of tachycardia on the R-R interval?
It shortens the R-R interval.
Multiple Choice: Which wave is typically the tallest on an ECG?
R wave
