ADAS1000-4 and ADAS1000-2 configuration for 12 leads

Hello Jefferson,

Thanks for your email.

The ADAS1000-4 has 3 ECG channels.

The ADAS1000-2 companion has 5 ECG channels.

From this you have 8 ECG inputs.

Normally for a 12lead configuration, 9 ECG input channels are used, this is more straightforward.

However, it is possible to realize a 12-lead configuration using 8 ECG channels by doing the following:

• ADAS1000-4 (use in common electrode mode with RA applied to the CM_IN and common mode buffer providing this to the other electrodes and to the slave device.
  •  Apply RA to the Common electrode input
  • Provide RA from common mode amplifier to the ADAS1000-2 device
  • Apply LA, LL, V1 to the 3 ECG inputs
    • Channel 1 = LA-RA (LEAD I)
    • Channel 2 = LL-RA (LEAD II)
    • Channel 3 = V1-RA
• ADAS1000-2
  • Apply V2-V6 to the 5 ECG inputs and with the RA from the Master device applied to CM_IN of this device
  • Use in electrode mode, ECG channels give you V2-RA, V3-RA etc
• Host must derive LEAD III, aVF, aVL, aVR and the Vx leads wrt WCT
  • LEAD II - LEAD I),
  • aVR=-(LEAD I+LEAD II)/2
  • aVL=(LEAD I- LEAD III)/2
  • aVF=(LEAD II +LEAD III)/2
  • Calculate WCT from the LEAD I/II/II to get V2 - WCT

Alternatively if an 8channel configuration with leads derived like this is not suited, then I  would advise choosing the ADAS1000 5-Ch ECG, there you would have 10 ECG channels with give you 9 ECG inputs and 1 spare channel.

Hope this helps!

Catherine.

Thank you so much... I just need to clarify one more thing, how can achieve this "Calculate WCT from the LEAD I/II/II to get V2 - WCT"

I can not find a mathematics equation to get WCT from Limb leads. Can you help with this last doubt?

Thanks in advanced.

Yes, that's it!

Vx-WCT = Vx-RA - (LI+L2)/3

best regards,

Catherine.

I think I solved. 

I have Vx - Ra and I need Vx - WCT or Vx - (RA + LA + LL)/3 so...

Vx - (RA + LA + LL)/3 + (RA - RA)

Vx - RA - (RA + LA + LL)/3 + RA

Vx - RA + (3*RA - RA - LA - LL)/3

Vx - RA + (2*RA - LA - LL)/3

Vx - RA + (- (LA - RA) - (LL - RA))/3

finally...

(Vx - RA) - (L1 + L2)/3 which is equal to Vx - WCT

Dear Catherine, 

Can we test this configuration on the ADAS1000 EVM. If yes, Please let me know the settings to be done.

Thanks