Navigation Links
Several methods for enhancing the functioning of defibrillators in cases of heart attack

This release is available in Spanish.

The PhD, defended by engineer Sofa Ruiz de Gauna Gutirrez at the University of the Basque Country (UPV/EHU) puts forward various methods for the elimination of interference caused by compressions and ventilations of cardiopulmonary resuscitation in the context of cardiac defibrillation.

A heart attack, also known as myocardial infarction or coronary thrombosis, is the most dramatic manifestation of cardiovascular illness, the main cause of death in developed countries.

In more than 40% of heart attacks patients can have two types of cardiac arrhythmias: ventricular or tachycardial ventricular fibrillation without pulse. The optimum treatment in these cases is the immediate initiation of cardiopulmonary resuscitation (CPR) to maintain artificial circulation by means of the application of thoracic compressions and ventilations, followed by an electrical discharge on the patients chest (defibrillation) when the cardiac rhythm is defibrillable. There is evidence that the success of the defibrillation is directly related to the immediacy with which the discharge is administered.

The automatic external defibrillator (AED) is a device capable of analysing the electrocardiogram and applying, if necessary, defibrillation. The mechanical activity of the thoracic compressions and ventilations induces interference on the electrocardiogram that compromises the reliability of the AED diagnosis. Consequently, cardiopulmonary resuscitation has to be interrupted during the intervals of automatic analysis, causing the absence of circulation and reducing the probability of success of electrical therapy.

This was the theme of the PhD thesis by Ms Sofa Ruiz de Gauna Gutirrez at the higher technical School of Engineering of the UPV/EHU, a work in which various methods for the elimination of this interference caused by compressions and ventilations of the cardiopulmonary resuscitation itself were proposed. The interference-free electrocardiograph signal enables the defibrillator to correctly diagnose during the CPR procedure, avoiding the interruption of compressions and enabling the administration of the discharge as soon as possible.

The PhD, entitled Eliminacin de la interferencia debida a la resucitacin cardiopulmonar en el contexto de la desfibrilacin cardaca (Elimination of interference due to cardiopulmonary resuscitation in the context of cardiac defibrillation) was led by the Head of the Department of Electronics and Telecommunications, Ms Elisabete Aramendi Ecenarro, and obtained summa cum laude. The PhD was carried out with help from the Osatu S. Coop. company, the Hospital of Cruces, the Hospital Donostia and the University of Stavanger (Norway).

Ms Sofa Ruiz de Gauna Gutirrez is a Telecommunications Engineer from the University of the Basque Country and currently collaborating lecturer with the UPV/EHU.

Elimination of interference

In this work various methods for the elimination of interference caused by compressions and ventilations of the cardiopulmonary resuscitation are put forward. The methods of filtration designed are divided into two groups: those that only analyse the information of the electrocardiogram registered by the AED and those that require additionally a single signal of reference to estimate the interference.

The methods have been evaluated using signals obtained from real resuscitation events undertaken by emergency service crews in various locations. The results for sensitivity and specificity obtained are similar to those of other published methods of greater complexity, and so support the hypothesis that analysis of cardiac rhythm is possible during cardiopulmonary resuscitation. Nevertheless, the elimination of interference in non-defibrillable rhythms presents greater difficulty and has to be investigated further in this regard.

The methods designed can be easily incorporated into current AEDs, with minimum modifications to their configuration. The AED diagnosis would be sufficiently reliable for the recommendation of a discharge during the cardiopulmonary resuscitation procedure, and thus the defibrillation decision can be facilitated. This fact supports the current tendency to administer compressions continuously, without unnecessary interruptions and augmenting, in the last analysis, the probability of defibrillation success.


Contact: Irati Kortabitarte
Elhuyar Fundazioa

Related medicine news :

1. London Luxury Receives Asthma & Allergy Friendly(TM) Certification for Several of Its Bedding Products
2. Derma Sciences Announces Several Clinical Presentations on MEDIHONEY(TM) Wound & Burn Dressings at Upcoming APWCA Conference
3. Merck Pays More Than $400 Million to Settle Federal, State Medicaid Fraud Investigation Sparked by Qui Tam Whistleblower Case Detailing Marketing Schemes for Vioxx(R), Zocor(R), Several Other Drugs
4. Several genes that regulate the disease SLE have been identified
5. Forest Laboratories, Inc. and Merz Pharma GmbH & Co. KgaA File Lawsuits Against Several Companies for Patent Infringement
6. Wyeth Consumer Healthcare Initiates Voluntary Recall and Replacement Program for Several Robitussin Products and Childrens Dimetapp Cold & Chest Congestion
7. Announces Corporate Sponsorships with Several of the Nations Leading Health Charities
8. Governor Rendell Announces CHIP Enrollment Clinics at Several Rite Aid Stores
9. Disgusting videos used to study coping methods
10. Air Methods to Report Fourth Quarter and Fiscal Year 2007 Financial Results on Wednesday, March 12, 2008
11. Cold Spring Harbor Protocols features high-throughput methods for analyzing gene activity
Post Your Comments:
(Date:11/28/2015)... , ... November 28, 2015 , ... Pixel Film Studios ... media panels to choose from, the possibilities are endless. Users have full control over ... the ProPanel: Pulse masking effects, users are sure to get heads to turn. , ...
(Date:11/27/2015)... ... , ... The rapid speed at which Americans are aging ... is needed, especially with Alzheimer’s, dementia and other cognitive conditions becoming more prevalent. ... part of this equation: 80 percent of medical care occurs in the home, ...
(Date:11/27/2015)... ... November 27, 2015 , ... ... edition of USA Today in Atlanta, Dallas, New York, Minneapolis, South Florida, with ... digital component is distributed nationally, through a vast social media strategy and across ...
(Date:11/27/2015)... ... ... A simply groundbreaking television series, "Voices in America", which is hosted by Hollywood legend, ... that are presently affecting Americans. Dedicated to providing the world with a wide variety ... consumers focus on, one episode at a time. , In the latest installment ...
(Date:11/27/2015)... ... , ... Dr. Thomas Dunlap and Dr. Patrick Coleman , ... Emergency Medicine at St., Joseph Health System’s Santa Rosa Memorial Hospital , co-hosted ... similar ways and require time-critical intervention to avoid large area heart damage and progressive ...
Breaking Medicine News(10 mins):
(Date:11/26/2015)... November 26, 2015 ... nieuwe aanpak combineert immunotherapie met Bremachlorin-photodynamische therapie ... ) --> ... (Photo: ) ... Medisch Centrum (LUMC) blijkt ...
(Date:11/26/2015)... 2015 Research and Markets ( ... "2016 Future Horizons and Growth Strategies in the ... Country Segment Forecasts, Competitive Intelligence, Emerging Opportunities" ... --> --> This new 247-page ... therapeutic drug monitoring market, including emerging tests, technologies, ...
(Date:11/26/2015)... --> ... att använda SyMRI för att hitta optimal ... med multipel skleros (MS) eller hjärntumörmetastaser och ... för att kunna använda SyMRI Research Edition ... kan man generera flera konstrastbilder från en ...
Breaking Medicine Technology: