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Algorithms to reanimate the heart
Date:10/2/2007

a cardiorespiratory arrest. To draw up this database, researchers needed data on hundreds of normal heartbeats and life-threatening ones and for this they had the help of hospitals and doctors registering the heartbeats of children.

Once the database was drawn up, reliable algorithms suitable for children were designed, i.e. digitalised signals or the electrocardiograms registered by the computers were processed and a number of parameters analysed such as, for example, the frequency of the electrical signals, their morphology, their spectrum and the most significant time/frequency parameters. Depending on all these parameters, the researchers carry out a classification of the signals, thus enabling a decision to be made if there is a life-threatening heart rate.

The obstacle of time

As mentioned before, time makes the difference between life and death in many of these cases. Often, a massage is sufficient to reanimate the heart and recover a normal heartbeat. Sometimes, however, a massage is insufficient and this is when time may be lost. In fact, when a massage is given, an electrocardiogram signal cannot be analysed nor can an electric discharge be applied. So, until a study of the electric signals is carried out and a check made to see if an electro-treatment will save a patient from almost certain death, seconds and minutes will have passed; seconds and minutes that make a difference between life and death The UPV-EHU engineers have looked at the option of unifying the automatic defibrillator analysis and the massage. The problem is that the signal received by the AED from the skin is distorted by the movement due to the massage, and so the result of the diagnosis is not very reliable. The UPV-EHU researchers have undertaken research on specific methods which avoid these distorsions and obtain a more reliable diagnosis.

They apply specific methods in order to distinguish the clean signal without distorsions. For example, th
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Contact: Irati Kortabitarte
iratik@elhuyar.com
34-943-363-040
Elhuyar Fundazioa
Source:Eurekalert

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