Maybe these ECG loggers are near to what David ask? www.innovexpo.itee.uq.edu.au/2003/exhibits/s363025/thesis.pdf www.innovexpo.itee.uq.edu.au/2003/exhibits/s363008/thesis2.pdf regards, Marco ----- Original Message ----- From: "David Euans" To: "Microcontroller discussion list - Public." Sent: Friday, November 06, 2009 5:31 AM Subject: Re: [EE] Heart beat logger > David- > Your friend should ask his/her doctor about ordering a cardiac event > recorder. Basically what happens is that the patient wears a device > which is constantly capturing and saving the last few minutes of an > EKG tracing. He/she pushes a button whenever the abnormal heartbeat > or whatever occurs. After pushing the button the patient is > instructed to call a monitoring service and downloads over the phone > the last 15 or so minutes of heart beats prior to the button push. > Typically, the patient wears the device for 2-4 weeks which is usually > enough to get the needed information. It is usually a very helpful > test. > > For true diagnostic purposes you really need to capture an EKG signal > and save that. An R-R interval recording device may confirm the > presence of an arrhythmia but still leave the exact diagnosis in > question. The absence of any abnormal rhythm during or preceding the > symptoms would lead one away from a cardiac diagnosis. > > Dave > > On Nov 5, 2009, at 3:13 PM, David Duffy (AVD) wrote: > >> Apptech wrote: >>>> Has anyone here built a heart beat logger? I'm wanting to log each >>>> beat, >>>> not the average rate. >>>> >>>> It would be worn by the user while sleeping. Wireless would be >>>> ideal, >>>> but tethered is not out of the question. >>>> >>> >>> For interest - what is the reason? >>> >> >> Hi Russell, >> Someone I know has an ongoing issue (last few years) of an occasional >> feeling of racing heart, accompanied by feeling "odd / shaky" at that >> moment. Almost always while sleeping (it wakes them up), but it has >> occurred while awake a few times. >> >> They have tried wearing a 24 hour heart monitor (on loan from >> hospital), >> but Murphy's Law has always meant that the symptom has never occurred >> when the monitor was present. >> >> In a given month, the effect may happen 0 - 8 times, seemingly with no >> pattern. Various doctors and specialists are yet to figure out what is >> going on. >> >> Since the episodes are fairly brief and hard to capture, there is >> uncertainty on whether the heart is doing weird stuff, or it just >> feels >> that way. >> >> The logger idea was to try to record heart beat data over extended >> periods for review if an episode had occurred. Hopefully this data may >> help doctors get further down the path to a solution. >> David... >> >> -- >> ___________________________________________ >> David Duffy Audio Visual Devices P/L >> Unit 8, 10 Hook St, Capalaba 4157 Australia >> Ph: +61 7 38235717 Fax: +61 7 38234717 >> Our Web Site: www.audiovisualdevices.com.au >> ___________________________________________ >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist