Longest ECG ever measured non-invasively

December 5, 2013, Karlsruhe Institute of Technology
Compact and easy to apply: The sensor belt reliably monitors cardiac activity and other parameters for a long period of time. Credit: KIT

Patients suffering from cardiac diseases may rapidly become emergencies. Then, seconds decide about life and death. However, many cardiac diseases are announced several months before. Symptoms are simply overlooked. A long-term ECG may help. A sensor belt developed at KIT for the first time allows to document cardiac activity of a patient over a long term all around the clock for up to six months. The sensor belt is now presented by the researchers at the Medica trade fair in Düsseldorf.

"The sensor belt also detects very rare cardiac events and, hence, helps find an appropriate therapy," Wilhelm Stork of Karlsruhe Institute of Technology explains. By means of the device, a number of parameters, such as cardiac and breathing frequency, activity, and conductivity can be measured continuously over a very long term and an electrocardiogram (ECG) is recorded. "Then, the doctor has all the data he needs to help the patient so early that no emergency develops."

Karlsruhe Institute of Technology, the Karlsruhe Municipal Hospital, and the University Hospital of Tübingen tested long-term usability of the sensor belt. About 50 test persons took part and wore the belt for some days up to some weeks and for about two weeks on the average. Before, the patients had suffered from an acute cardiac insufficiency. In the post-treatment phase, the sensor belt was applied for continuous monitoring. One test person was even monitored for a continuous period of six months.

The sensor belt contains four novel dry electrodes. As a result, irritation of the skin is prevented. Wearing comfort is ensured for months and very reliable measurement data are collected. The patient can easily apply the belt on his own. "The belt resembles known pulse monitors for joggers and also looks similar. However, it records far more data," Malte Kirst, one of the developers at KIT, says. Measurement electronics has about the weight and size of a small mobile phone. Over a period of a week, more than 1 gigabyte of data are acquired. Then, the memory card is read out and the accumulator is recharged. "Due to the special design and data evaluation, a usable ECG is recorded for about 99% of the time even when single electrodes fail as a result of body movement, for instance," Kirst says. He generated parts of the analysis software at the Research Center for Information Technology (FZI) before he came to KIT.

Conventional mobile ECG measurement devices require conductive pastes. The self-adhesive electrodes are attached precisely to the skin by medical staff. Often, skin irritations occur after some days or the paste dries out. As a rule, data are recorded for 24 hours, sometimes for seven days. In case of high-risk patients, the measurement devices used for monitoring may also be implanted by an operation. The new sensor belt combines the advantages of both systems and has no drawbacks. It might be an easy help for more patients.

Chronic is one of the most frequent cardiovascular diseases, the persons affected in Europe totaling about 10 million. More than 40% of the patients die within five years upon diagnosis. The disease causes billions of healthcare costs due to the intensive treatment of emergencies and subsequent long stays at hospitals. Hence, it is highly beneficial for both patients and the healthcare system to diagnose starting cardiac failure (decompensation) at an early point of time and to initiate treatment. By means of continuous monitoring with e.g. the sensor belt, decompensation can be predicted and measures can be taken in due time.

The sensor may also be applied for the diagnosis of atrial fibrillation and so-called syncopes, i.e. spontaneous losses of consciousness. About 400,000 patients in Germany are affected. "Reliable, long-term ECGs are required in order to identify or exclude the heart as the cause," Stork says. A team of four is presently working on turning the sensor belt prototype into a medical product for this application. Under the Exist programme of the Federal Ministry of Economics, the development work is funded with EUR 500,000.

Explore further: AHA: Case vignette weighs pre-sport cardiac screening

Related Stories

AHA: Case vignette weighs pre-sport cardiac screening

November 20, 2013
(HealthDay)—Two questions relating to cardiac screening for high school students before participation in competitive sports are discussed in a case vignette published online Nov. 19 in the New England Journal of Medicine ...

Belt to prevent and rehabilitate lower back pain launched

April 23, 2013
FIK, Tecnalia and BTS launch a belt to prevent lower back pain problems and provide rehabilitation at home and at work. The Lumbia device can be used for patient´s assessment, and for therapy during postural reeducation.

Heart surgery mortality rates significantly reduced

November 25, 2013
Fifty years have passed since the first heart operation was carried out with a heart-lung machine at the MedUni Vienna in the Vienna General Hospital. Since then cardiac surgery has developed at an astonishing rate – to ...

Recommended for you

A nanoparticle inhalant for treating heart disease

January 18, 2018
A team of researchers from Italy and Germany has developed a nanoparticle inhalant for treating people suffering from heart disease. In their paper published in the journal Science Translational Medicine, the group describes ...

Starting periods before age of 12 linked to heightened risk of heart disease and stroke

January 15, 2018
Starting periods early—before the age of 12—is linked to a heightened risk of heart disease and stroke in later life, suggests an analysis of data from the UK Biobank study, published online in the journal Heart.

'Decorated' stem cells could offer targeted heart repair

January 10, 2018
Although cardiac stem cell therapy is a promising treatment for heart attack patients, directing the cells to the site of an injury - and getting them to stay there - remains challenging. In a new pilot study using an animal ...

Two simple tests could help to pinpoint cause of stroke

January 10, 2018
Detecting the cause of the deadliest form of stroke could be improved by a simple blood test added alongside a routine brain scan, research suggests.

Exercise is good for the heart, high blood pressure is bad—researchers find out why

January 10, 2018
When the heart is put under stress during exercise, it is considered healthy. Yet stress due to high blood pressure is bad for the heart. Why? And is this always the case? Researchers of the German Centre for Cardiovascular ...

Heart-muscle patches made with human cells improve heart attack recovery

January 10, 2018
Large, human cardiac-muscle patches created in the lab have been tested, for the first time, on large animals in a heart attack model. This clinically relevant approach showed that the patches significantly improved recovery ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.