lead
Medical term EKG and Cardiovascular Testing
A view of the heart's electrical activity, recorded as the voltage difference between electrodes; the word may also mean the cable.
Sources
Related terms
- electrodeA sensor placed on the skin that picks up the heart's electrical signals for the EKG.
- heart blockAn interruption in the heart's normal electrical conduction pathway, such as an AV block.
- Holter monitorA portable EKG recorder worn during normal activity, usually for 24 to 48 hours (Merck: 24 hours to 14 days).
- isoelectric lineThe flat baseline on an EKG when no electrical activity is recorded.
- 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.
- P waveThe first wave of the EKG cycle, showing atrial depolarization.