Navigation Links
Algorithm for exterior defibrillators that correctly both adult and child arrhythmias
Date:3/21/2011

This press release is available in Spanish.

Ventricular Fibrillation (VF) is a series of intense and disordered contractions of the ventricles (they are located in the lower part of the heart). In 40 % of respiratory arrests suffered outside a hospital, it was shown that the first cardiac rhythm corresponds to VF, and the only manner to combat it is with electric discharges provided by defibrillation. This is why the presence of Automated External Defibrillators (AED) in public places is increasingly common. Telecommunications engineer Unai Irusta has carried out an enhancement-optimisation of these machines, having drawn up an innovative algorithm for them. His PhD thesis, presented at the University of the Basque Country (UPV/EHU), is entitled, New signal processing algorithms for automated external defibrillators.

When an AED is activated, the first thing to be done by it is to examine the heart rhythm (electrocardiogram) of the patient, before applying the first discharge. That is, before anything else, the arrhythmias that can be defibrillated or cannot have to be identified, because the discharges are not useful except in the former. This is precisely where Dr Irusta has carried out his greatest contribution. The arrhythmias of adults and children who suffer these kinds of arrests are not the same, and this researcher has worked on fusing the data from each. With this, he has created an innovative algorithm for AEDs that correctly distinguish the rhythms that can be defibrillated and those that cannot, both with adults and with children.

2,782 records in total

In order to design the algorithm, Dr Irusta started by creating a database of arrhythmias. On the one hand, he gathered and classified 1,090 child arrhythmias; according to the thesis, this is a children's database equal to the most important ones undertaken in the field of AEDs. As regards adults, ha reanalysed an already existing database, to which 928 new records were added. With the sum of both, he completed a database of 2,782 records, of which 1,270 were used for developing the algorithm, and 1,512 for its validation.

With all this, Dr Irusta presented his thesis on the new algorithm made up of four sub-algorithms. These are based on new parameters which were calculated thanks to new records in various zones of the signal, in order to thus detect the arrhythmias; these involve parameters such as time, frequency, inclination and autocorrelation function. The algorithm was verified to have surpassed the minimum laid down by the American Heart Association as regards capacity to detect rhythms which can or cannot be defibrillated, both with adults and with children.

Problems with interference

Dr Irusta also studied the capacity of the new algorithm for identifying data for cardiac arrests recorded by AED electrocardiogram. To deal with the arrest, cardiopulmonary resuscitation (CPR) is employed just up to the moment when an AED can be accessed, given that the impulses on the chest during resuscitation cause interferences in the electrocardiogram. However, in reality it would be more effective to be able to apply the two techniques simultaneously, which is why Dr Irusta has investigated if the new algorithm could read the recording well, even while continuing with CPR.

The new algorithm identified heart rhythms with great precision in those cases in which there are no interferences due to CPR, and surpassing the conditions imposed by the American Heart Association. However, the results were not the ones desired when there was interference from RCP. Dr Irusta has designed a method for obviating the interferences of those recordings which have been contaminated. Thanks to this, it has been possible to precisely identify rhythms which can be defibrillated, but not those which cannot be defibrillated.


'/>"/>

Contact: Amaia Portugal
a.portugal@elhuyar.com
34-943-363-040
Elhuyar Fundazioa
Source:Eurekalert

Related medicine news :

1. More GPU Routines for Technical Research Now Available from Numerical Algorithms Group
2. Active Search Results Announces its New Search Engine Ranking Algorithm
3. Microsoft Excel-based algorithm predicts cancer prognosis
4. Hospices not deactivating defibrillators in patients
5. Widespread Public Defibrillators May Save Lives
6. Public Defibrillators Save Lives
7. As End of Life Nears, What to Do With Implanted Defibrillators?
8. New Software for Defibrillators Lowers Risk of Unnecessary Shocks
9. External Defibrillators Not Much Help in Hospitals
10. University of Colorado in pilot project to map defibrillators
11. Old Defibrillators Safe for Re-use
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/8/2016)... ... December 08, 2016 , ... CURE Media Group, the nation’s leading ... has aligned with Upstage Lung Cancer in efforts to combat lung cancer, announced CURE ... Hennessy, Jr said, “CURE Media Group is honored to team up with Upstage Lung ...
(Date:12/8/2016)... , ... December 08, 2016 ... ... Suite 10.2 version gives development continuity to its innovative Unified Instance Manager ... management capacity. In addition, this new version optimizes the unattended auto-dialing system ...
(Date:12/8/2016)... ... December 08, 2016 , ... Today’s patients are encouraged to ... mind, SIGVARIS has created a new line of anti-embolism stockings to help prevent ... the benefits of graduated compression when transitioning from recovery to early rehabilitation. , ...
(Date:12/8/2016)... ... December 08, 2016 , ... ... from offices headquartered in Jefferson County, is announcing the launch of a charity ... , The number of homeless women and children in Birmingham has grown steadily ...
(Date:12/8/2016)... ... December 08, 2016 , ... Bill Mull Agencies, a Wichita-based ... and around central Kansas, is joining the Youth Horizons organization for a charity ... Headquartered in Wichita, Youth Horizons works to empower area children from unstable, troubled, ...
Breaking Medicine News(10 mins):
(Date:12/8/2016)... A Small Business Innovative Research (SBIR) grant ... (NIH) to Phoenix -based NeuroEM Therapeutics, ... grant will seek to determine an optimal set of ... waves to treat Alzheimer,s Disease. The grant will also ... treat other neurologic disorders such as Parkinson,s Disease and ...
(Date:12/8/2016)... -- Economic growth in the United States will continue in ... in their December 2016 Semiannual Economic Forecast. Expectations are ... in mid-2009, as indicated in the monthly ISM ® ... manufacturing sector is optimistic about growth in 2017, with ... the non-manufacturing sector indicates that 14 of its industries ...
(Date:12/8/2016)... LOS ANGELES , Dec. 8, 2016 /PRNewswire/ ... and manufacturing of dissolution testing and diffusion testing ... has been acquired by Teledyne Instruments, Inc. ("Teledyne"). ... Hanson,s long-proven line of precision testing instruments, as ... while accelerating development of new products and services. ...
Breaking Medicine Technology: