P wave
Medical term EKG and Cardiovascular Testing
The first wave of the EKG cycle, showing atrial depolarization.
Sources
Related terms
- depolarizationThe electrical change in heart or nerve cells that triggers contraction or a signal.
- leadA view of the heart's electrical activity, recorded as the voltage difference between electrodes; the word…
- limb leadsThe six frontal-plane views of a 12-lead EKG: leads I, II and III and the augmented leads aVR, aVL and aVF.
- murmurAn unusual heart sound heard with a stethoscope, often from a valve or septal defect.
- normal sinus rhythmThe normal heart rhythm, started by the sinus (SA) node at a normal rate.
- 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.
- QRS complexThe EKG waveform showing ventricular depolarization.