QRS complex
Medical term EKG and Cardiovascular Testing
The EKG waveform showing ventricular depolarization.
Sources
Related terms
- depolarizationThe electrical change in heart or nerve cells that triggers contraction or a signal.
- P waveThe first wave of the EKG cycle, showing atrial depolarization.
- PR intervalThe EKG measurement from the start of the P wave to the start of the QRS complex.
- precordial leadsThe six chest leads, V1 to V6, that view the heart in the horizontal plane.
- Purkinje fibersConduction fibers that spread the impulse through the ventricular walls so the ventricles contract.
- repolarizationThe return of a cell to its resting electrical state after depolarization.
- rhythm stripA printed EKG tracing from one lead, often six seconds long, used to assess heart rhythm.
- SA nodeSinoatrial node: the heart's natural pacemaker in the right atrium, where each normal beat starts.
- sinus bradycardiaA regular rhythm from the SA node at fewer than 60 beats per minute.