2006-11-30 13:33:16 · 3 answers · asked by jay 1 in Health ➔ Diseases & Conditions ➔ Heart Diseases
Because 12 different leads are made. 9 of them are actuall leads, I,II,III, V1-V6 but AVR, AVF, AVL are calculated by the computer and not ture leads.
each lead represtents a specific area of the heart
2006-11-30 14:17:34 · answer #1 · answered by juno406 4 · 0⤊ 0⤋
A German by the name of Einthoven created the electrocardiogram (ECG) in the late 1800s using 3 electrodes (which record electrical activity) and had therefore 3 'leads'. This was expanded to 6 leads (using the arms and legs 3 leads are recorded unipolor and 3 leads bipolar) and finally to 12 with the addition of 6 'chest' leads. Indeed there are 12 leads and not 10. I have written an article of the history of the ECG if you would like a copy please let me know johnerussomd@jhu.edu
2006-12-01 02:17:20 · answer #2 · answered by john e russo md facm faafp 7 · 0⤊ 0⤋
There are 12 1-3 Avr-avf, V-1-V-3 V-4-v-6
2006-12-01 02:39:53 · answer #3 · answered by Anonymous · 0⤊ 0⤋