How to avoid determining P wave in PVC beat ?

Hello

Please help..me.

i am use the code to detect p wave on ECG Signal.

%%%P Peak detection

a=Rloc(i,j)-90:Rloc(i,j)-10;

m=max(y1(a));

b=find(y1(a)==m);

b=b(1);

b=a(b);

Ploc(i,j)=round(b);

Pamp(i,j)=round(m);

when pvc beat in signal the p wave you take location , how can be avoid that please? and thanks.

Answer 1

[Star Strider]

There is no true P-deflection preceding a PVC.

That is essentially the definition of a Premature Ventricular Contraction or Premature Ventricular Complex (PVC), in which the ventricular contraction is initiated by the Prukinje fibers rather than the SA node. That a P-deflection appears just prior to the following ectopic deflection does not mean that the P-deflection initiated the ectopic contraction. Here, it appears simply to be a chance occurrence. The PVC has an associated compensatory pause following it, in which the A-V node is depolarised and suppressed. See Braunwald's Heart Disease, Single Volume, 12th Edition for a thorough discussion.

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[mona shabaan]

Thanks for the answer.

I know there is no p wave before pvc beat but she takes value and amplitude, i am try avoid it.

[Star Strider]

My pleasure.

There can be a P-wave before a PVC. The P-wave does not cause the subsequent ventricular contraction. The timing of the two is simply coincidence.

[mona shabaan]

thank you.

[Star Strider]

My pleasure!