In the normal electrocardiogram, the PR interval represents
Atrial depolarization
Ventricular depolarization
Atrial activation of the onset of ventricular activity
“electrical systole” of the ventricles
The Correct Answer is C
In the normal electrocardiogram, the PR interval represents
The PR interval represents the time from the onset of atrial activation to the onset of ventricular activity. During this time, the electrical impulse travels through the atria, the atrioventricular (AV) node, and the bundle of His before entering the ventricles and initiating ventricular depolarization. Option A is incorrect because the atrial depolarization is represented by the P wave. Option B is incorrect because the ventricular depolarization is represented by the QRS complex. Option D is incorrect because there is no such term as “electrical systole” of the ventricles in ECG interpretation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Tachycardia refers to a heart rate that is faster than the normal range, which is typically considered to be between 60 and 100 beats per minute in adults. A heart rate of 110 beats per minute is above the normal range and is considered tachycardia.
Correct Answer is B
Explanation
Varicose veins occur when the valves within the veins, which normally prevent the backflow of blood, become damaged or weakened, allowing blood to pool and the veins to become enlarged and twisted. This can occur due to a variety of factors, including age, pregnancy, obesity, genetics, and prolonged periods of standing or sitting. An increase in hydrostatic pressure can contribute to the development of varicose veins, but it is not the primary cause.
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