IndAeMed_F: Re: Postmortem lividity
- From: USM Bish <bish@xxxxxxxxxxx>
- To: indaemed@xxxxxxxxxxxxx
- Date: Mon, 5 Apr 2004 20:49:55 +0530
Thru IndAeMed@xxxxxxxxxxxxx:
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On Sun, Apr 04, 2004 at 05:55:27PM +0530, SS Mishra wrote:
>
[Lots snipped]
>
> I agree it is not hydrostatic lividity. Most likely it occurs
> due to still intact hemoglobin (and its reaction products),
> escaping into tissue spaces from torn capillaries (likely to be
> because of explosive accn, rather than explosive fragmentation
> (as in that case we will get nothing barring mangled tissue
> pieces).
>
Yes, this is it. One of the most fragile capillaries lie under
nail beds which would give way with slightest of trauma,
causing the blood to come under the nailbed. It is this blood
which undergoes subsequent discolouration to produce the
bluish-purple hue.
>
> And Bish Sir, not expected from you. Isn't Physiology
> principles of physics and chemistry applied to the living
> organism? How can physiology function independently of the
> physical and chemical phenomena?
>
In the most fundamental sense, what you say is correct;
perhaps, I have not conveyed it correctly. We have a tendency
to explain everything on a physiological basis; viz. a blue
hand would indicate "cyanosis" and go into things like oxygen
debt and tissue metabolism. Whereas, in this case, it is
different, and should be explained on basic sciences, instead
of going to the next step, where physiological factors would be
at play.
Bish
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