From len.marinis at cogentsoftware.net  Tue Jul 12 13:45:31 2005
From: len.marinis at cogentsoftware.net (Len Marinis)
Date: Tue, 12 Jul 2005 10:45:31 -0700 (PDT)
Subject: [Physionet-users] WQRS
Message-ID: <20050712174531.33444.qmail@web32906.mail.mud.yahoo.com>

Hello,

I'm wondering if any sort of write up exists which describes the reasoning
& methodology used by the WQRS application. I am following the source code
just fine but find myself a bit baffled as to how the constant parameters
were chosen and such?

I am currently working on a system which would benefit greatly from
automated identification of QRS wave characteristics. If anyone can
suggest a better starting point to learn how such processing has been done
in the past, I'm all ears.

Thanks for any help,
-Len


From george at mit.edu  Tue Jul 12 16:05:44 2005
From: george at mit.edu (George Moody)
Date: Tue, 12 Jul 2005 16:05:44 -0400
Subject: [Physionet-users] WQRS
In-Reply-To: <20050712174531.33444.qmail@web32906.mail.mud.yahoo.com>
References: <20050712174531.33444.qmail@web32906.mail.mud.yahoo.com>
Message-ID: <42D42298.5060009@mit.edu>

Len Marinis wrote:
 > Hello,
 >
 > I'm wondering if any sort of write up exists which describes the reasoning
 > & methodology used by the WQRS application.

See this paper about WQRS:
    W. Zong, G.B. Moody, D. Jiang. "A robust open-source algorithm to detect
    onset and duration of QRS complexes," Computers in Cardiology 30:737-740
    (2003);  http://ecg.mit.edu/george/publications/qrs-cinc-2003.pdf


From lipse_huang at 163.com  Fri Jul 15 06:59:54 2005
From: lipse_huang at 163.com (=?gb2312?B?bGlwc2VfaHVhbmc=?=)
Date: Fri, 15 Jul 2005 18:59:54 +0800 (CST)
Subject: [Physionet-users] ecg baseline shift
Message-ID: <42D7972A.000010.24165@m142.163.com>

Hi,everybody:
  Is there any program implementation about cancelling the ecg baseline shift in physionet.I found the high filters didn't work well.
thanks
zhongchao

From mickael.pruvost at u-picardie.fr  Mon Jul 25 11:57:05 2005
From: mickael.pruvost at u-picardie.fr (Mickael Pruvost)
Date: Mon, 25 Jul 2005 17:57:05 +0200
Subject: [Physionet-users] Contribution
Message-ID: <EBEOLMBBKOIKBFACNFBHCEMKGBAA.mickael.pruvost@u-picardie.fr>

Hi,

I'm working on physionet files and it took me too much time to download and
install physionet toolkits for the conversion to matlab format. So i created
matlab scripts wich convert '.dat' files to recover directly signals based
on the work of Tratnig and Rheinberger.

These are 2 scripts for ECG databases (MIT-BIH Normal Sinus Rhythm Database
and Post-Ictal Heart Rate Oscillations in Partial Epilepsy) and one script
for multi-parameter database (MIT-BIH Polysomnographic Database) They can be
modified easily to fit other databases.

There is just a memory problem still to resolve for Polysomnographic
database when there are more than 4 signals and a long recording duration
but probably linked to memory.

I think this could be useful for matlab users who want to use their own
algorithm on the database.

I have already send a mail for contributions but didn't receive any reply.

PRUVOST Mickael
Research Group on Multimodal Analysis of Cerebral Function (GRAMFC)
http://www.u-picardie.fr/labo/GRAMFC
Faculty of Medicine, Amiens, France.