Browsing by Author "Scherr, D"
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- ItemAutomated and manufacturer independent assessment of the battery status of implanted cardiac pacemakers by electrocardiogram analysis.(2007-02-02) Schreier, G; Hayn, D; Kollmann, A; Scherr, D; Lercher, P; Rotman, B; Klein, WAccording to international standards cardiac pacemakers have to indicate the status of their batteries upon magnet application by specific stimulation patterns The purpose of this study has been to assess whether this concept can be used as a basis for automated and manufacturer independent examination of the depletion level of pacemakers in the framework of a collaborative telemedical pacemaker follow up system A prototype of such a system was developed and tested in a real clinical environment Electrocardiograms ECGs were recorded during magnet application and automatically processed to extract the specific stimulation patterns The results were used to assign each signal a corresponding pacemaker status ok replace or undefined based on the expected behavior of the devices as specified by the manufacturer The outcome of this procedure was compared to the result of an expert examination resulting in a positive predictive value of 100 for the detection of ECGs indicating pacemaker status ok The method can therefore be utilized to quickly safely and manufacturer neutrally classify cases into the categories ok and needs further checking which in a telemedical setting may be used to increase the efficiency of pacemaker follow up procedures in the future
- ItemMobile phone-based surveillance of cardiac patients at home.(2006-07-19) Scherr, D; Zweiker, R; Kollmann, A; Kastner, P; Schreier, G; Fruhwald, F MWe tested the reliability acceptability and feasibility of a home monitoring system for cardiac patients Each participant was equipped with a mobile phone an automatic blood pressure device and a digital weight scale In total 20 patients 14 patients with chronic heart failure six patients with hypertension mean age 50 years standard deviation SD 14 were monitored for 90 days each They were asked to measure their blood pressure pulse and body weight every day and to transfer the data together with the dosage of medication to the telemonitoring server using wireless Internet technology in the mobile phone The physician in charge received email alerts when reported data fell outside pre defined limits The patients compliance with the system was high During a cumulative monitoring period of 1 735 days there were 2 040 data transfer sessions a mean of 102 per patient SD 43 The mean percentage of successful data transfers was 83 SD 22 The stability of the telemonitoring system was 98 meaning that patient data transfer was almost always possible The accessibility of the secure web server for physicians was above 99 The web based home monitoring system was reliable and easy to handle for both patients and health care professionals It may be a useful tool for patients with heart failure as well as hypertensive patients
- ItemNear Field Communication-based telemonitoring with integrated ECG recordings.(2013-04-25) Morak, J; Kumpusch, H; Hayn, D; Leitner, M; Scherr, D; Fruhwald, F M; Schreier, GOBJECTIVES Telemonitoring of vital signs is an established option in treatment of patients with chronic heart failure CHF In order to allow for early detection of atrial fibrillation AF which is highly prevalent in the CHF population telemonitoring programs should include electrocardiogram ECG signals It was therefore the aim to extend our current home monitoring system based on mobile phones and Near Field Communication technology NFC to enable patients acquiring their ECG signals autonomously in an easy to use way METHODS We prototypically developed a sensing device for the concurrent acquisition of blood pressure and ECG signals The design of the device equipped with NFC technology and Bluetooth allowed for intuitive interaction with a mobile phone based patient terminal This ECG monitoring system was evaluated in the course of a clinical pilot trial to assess the system s technical feasibility usability and patient s adherence to twice daily usage RESULTS 21 patients 4f 54 14 years suffering from CHF were included in the study and were asked to transmit two ECG recordings per day via the telemonitoring system autonomously over a monitoring period of seven days One patient dropped out from the study 211 data sets were transmitted over a cumulative monitoring period of 140 days overall adherence rate 82 2 55 and 8 of the transmitted ECG signals were sufficient for ventricular and atrial rhythm assessment respectively CONCLUSIONS Although ECG signal quality has to be improved for better AF detection the developed communication design of joining Bluetooth and NFC technology in our telemonitoring system allows for ambulatory ECG acquisition with high adherence rates and system usability in heart failure patients