Maintenance Spo2 sensor
Spo2 Sensors Difference exist
How often SpO2 reposition?
How to test Spo2 sensor?
What's normal Spo2?
GE Spo2 probe-differ module
What's Spo2?
How to choose Spo2 sensor?
Digital&Analog spo2 sensor
Why 10 Lead EKG Called 12 lead
What's ECG?
ECG Color coding
Guide to put Electrode
Maintenance patient monitor
Maintenance patient monitor
Attention when use ECG Cable
How does Spo2 sensor work?
Skip to repair Spo2
Knowlege of NIBP Cuff
Principle Of Measuring ETCO2
ETCO2 Monitored Indications

Why 10 Lead EKG Called 12 lead 

Why is it called a 12 lead ECG, if it only has 10 leads?
For ECG recording, 10 electrodes are used but at each level voltage difference between two electrode points is measured and the combination the two points is termed lead. Read on for further clarification....

The term "lead" in electrocardiography causes much confusion because it is used to refer to two different things. In accordance with common parlance the word lead may be used to refer to the electrical cable attaching the electrodes to the ECG recorder. As such it may be acceptable to refer to the "left arm lead" as the electrode (and its cable) that should be attached at or near the left arm. There are usually ten of these electrodes in a standard "12-lead" ECG.

Alternatively (and some would say properly, in the context of electrocardiography) the word lead may refer to the tracing of the voltage difference between two of the electrodes and is what is actually produced by the ECG recorder. Each will have a specific name. For example "Lead I" (lead one) is the voltage between the right arm electrode and the left arm electrode, whereas "Lead II" (lead two) is the voltage between the right arm and the left leg.

In all combinations, right leg electrode does not come into play because the right leg RL electrode provides a reference potential (neutral (N) or ground.


Home  |  Product Catalog  |  Spo2/ECG/EKG spare part  |  News  |  How to buy  |  Tech Forum  |  Cata Download  |  Contact Us  |  Sitemap  |  Mobile Version
  English     简体版     繁體版
Powered by DIYTrade.com
Home Product Catalog Spo2/ECG/EKG spare part News How to buy Tech Forum Cata Download Contact Us
HomeContact UsSitemap