EKG Basics

Front

What does the QRS complex represent in an electrocardiogram?

Back

The QRS complex represents ventricular depolarization.

Front

Which wave is not normally seen on an electrocardiogram tracing?

Back

The U wave is not normally seen on an electrocardiogram tracing.

Front

What does the T wave represent in an electrocardiogram?

Back

The T wave represents ventricular repolarization.

Front

Where is the sinus node located in the heart?

Back

The sinus node is located in the right atrium.

Front

What is the normal firing rate of the sinoatrial node?

Back

The sinoatrial node normally fires 60 to 100 times per minute.

Front

What is the function of the P wave in an electrocardiogram?

Back

The P wave represents atrial depolarization.

Front

What does an elevated ST segment indicate?

Back

An elevated ST segment may indicate myocardial infarction or ischemia.

Front

What is the significance of the U wave in an electrocardiogram?

Back

The U wave is thought to represent repolarization of the Purkinje fibers, but its significance is not well understood.

Front

What is the role of the AV node in the cardiac conduction system?

Back

The AV node acts as a gatekeeper, slowing down the electrical signal before it enters the ventricles.

Front

What does a prolonged QT interval indicate?

Back

A prolonged QT interval can indicate an increased risk of arrhythmias.