Denis Abelson has approached me about constructing something to simultaneously record:
- EKG (1 channel)
- Heart from stethoscope/microphone (1 channel)
- Doppler probe (1 channel)
- A Doppler Cardiometer with Electronic Gate, Transactions of the New York Academy of Sciences 1961. Dennis Abelson and Victor Meyer.
- Ultrasonic Doppler Auscultation of the Heart, JAMA, 1961. Vol 204, No 6
- Determination of Cardiovascular velocities by dopplercardiometry, Cardiovascular Research, 1971, 5, 545-549
- Reciprocal movement of the right and left heart, demonstrated by directional Doppler ultrasound, American Heart Journal, 1973, Vol. 86, No. 5. pp 651-652
- Analysis of the Doppler signals from the fetal heart, Am Journ Obstetric Gynecology, 1972 pp 796-801
The Android ECG device is an excellent example of how this kind of device can work.
- 26 Jun 2014
After meeting Denis it sounds like its not so important to record the microphone channel-- that would be helpful in an E.R. but less so for other cases. He feels the EKG is helpful to show the timing of the heart in relation to what is being heard on the doppler.
My hunch is that the real value here is just in showing people that they can use these cheap baby doppler monitors to listen to their own hearts. Denis can interpret and explain the sounds and a lot of people would benefit if they had a little guidance in interpreting what they can hear. The sounds are very clear. I imagine having one, listening to my heart, and then putting it away for ages until I have some reason to think my heart may be doing something weird.
So I'd lean away from adding EKG. But it would be good to be able to record the sounds very clearly and, for example, send the by email. That would be a way for Denis & me to build a library of examples. I bet there's an audio-in solution for phones to be had, which could use the audio-out from the doppler.
- 07 Jul 2014