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Help- problem with Q wave in ECG design

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Hi, i am doing the school project of ECG design now.

and the signal i obtained from scope is shown below

3102EE.jpg

it seems that the output signal shows P Q R S and T wave; however, there is something wrong about Q wave. related material says that a health man should have a S wave deeper than Q wave( i m in good condition now~~)

Can someone tell me what's wrong inside my schematic? how to improve that?

Here is the schematic:
7-31-2011 7-34-31 AM.jpg

the bode plot simulated by cadence is shown below (green)
modified FR.png

Thank you^_^
 

You have used high impedance feedback and twin T notch filtering using low slewrate op amps uA741 .
The input bias current in these are high .and compensation current reqts. are larger which loads the filters .
Pl go for high slew rate OPA like TL084 which have FET input stages and very high slew rates
 

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