I think he want to keep the 30HP but just disable the near death sound.
Well, I know painVisionTriggerHealth determines the pain vision. like the red/bloody heartbeat screen. default is "0.55", so you can disable it by setting it to 0.01 or whatever. I used this in my mods to prevent dark vision to be interrupted when hurt.
I don't believe it disables the sound tho.
Some things to try:
bg_shock_sound "1" (probably only for stun and shockgrenades tho)
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