What does the P wave represent in an ECG?
The P wave corresponds to atrial depolarization, indicating the start of the electrical activity in the heart.
What is the normal duration of the PR interval?
A normal PR interval ranges from 0.12 to 0.20 seconds, representing the time from atrial to ventricular depolarization.
Which lead configuration is most commonly used in continuous monitoring?
Lead II is typically used in continuous ECG monitoring due to its ability to clearly show the P wave.
Which artifact can be caused by patient movement?
Somatic tremor or muscle artifact is caused by voluntary or involuntary patient movement.
Which part of the ECG corresponds to ventricular depolarization?
The QRS complex reflects the rapid depolarization of the ventricles.
What is indicated by a prolonged QT interval?
A prolonged QT interval can indicate a risk of dangerous arrhythmias such as Torsades de Pointes.
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Which ECG change is seen in hyperkalemia?
Peaked T waves are a common sign of elevated potassium levels in the blood.
Which action is most important when preparing a patient for a 12-lead ECG?
Proper skin preparation helps ensure good electrode contact and reduces artifacts.
Which condition shows ST elevation on an ECG?
ST elevation is a hallmark sign of myocardial infarction or injury.