ECG: The precordial/chest leads V1,...,V6

Demonstration of how to record the precordial/chest leads of the standard ECG. The chest leads are so called "unipolar" leads where the negative input of the instrumentation amplifier is connected to all limbs via resistors which creates a "virtual" electrode which lies in the centre of the body. The positive electrode is then placed at six precisely defined positions on the chest called V1,...,V6.
Presenter: Vasso Georgiadou
biosignals.berndporr.me.uk

[@veeraganimanideep8903]

Thank u

[@rodrigoloza4263]

excuse, do you know how to read the analog signal with a microcontroller? I know it sounds fool but i can't get a good signal in my microcontroller. By the way, i am using an Arduino.

[@tommyjerry7544]

Hi, i like this video, I have a question, why is the virtual electrode pointing out of the chest? For my understanding, all the three componenten for the virtual electrodes are within the body plane, so the synthesize of them should also be within the plane. isnt it?

[@badapplez71]

anybody noticing her eyebrows while talking ?

[@anubis9812]

i had to re watch it again and try to not notice them.

[@hajaraks3165]

Why the resistance are connected in unipolar but not in bipolar

[@nishankcn4479]

Can someone explain how exactly the virtual lead is formed? Thanks!

[@BPMbiosignals]

just take the leads from right arm, left arm and left foot and connect them all together using 3 5K resistors. That goes then into the neg input of the amp. So it calculates the average potential between the limbs.

[@GeroG3N]

Why, instead of creating a virtual lead, can't we just place a real electrode in the center of the chest?

[@BPMbiosignals]

It'd be inside of the body so a bit tricky.