QRS complex

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QRS Complex

The QRS complex is a significant component of the electrocardiogram (ECG or EKG), which represents the electrical depolarization of the ventricles of the heart.

Pronunciation

QRS complex: /ˌkjuː ɑːr ˈɛs ˈkɒmplɛks/

Etymology

The term "QRS complex" is derived from the sequential labeling of the waves in an EKG. The Q wave is the first downward deflection, the R wave is the upward deflection, and the S wave is the second downward deflection.

Definition

The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram. It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the human heart and contraction of the large ventricular muscles.

Related Terms

  • Electrocardiogram: A test that measures the electrical activity of the heartbeat.
  • Ventricles: The two lower chambers of the heart which pump blood out of the heart.
  • Depolarization: The process during the action potential when the neuron's membrane potential becomes more positive.
  • P Wave: The first small wave of the EKG tracing, which represents the depolarization of the atria.
  • T Wave: The portion of the EKG tracing that represents the repolarization of the ventricles.

See Also

External links

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