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New implantable cardiac monitor with three-lead ECG and active noise detection

Neuer implantierbarer Herzmonitor mit 3‑Kanal-EKG und aktiver Artefakterkennung

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Abstract

Background

A new implantable cardiac monitor (BioMonitor, Biotronik) with a continuous remote monitoring option was prospectively implanted in patients with suspected arrhythmias or for therapy control after atrial fibrillation (AF) ablation. A three-lead ECG detection was intended to make the implantation more independent of the implantation site and the electrical heart axis. Because noise is a frequent problem in implantable cardiac monitors, an active noise detection algorithm was implemented. The aim of the trial was to evaluate the clinical performance of the device.

Methods

The device performance was evaluated in a prospective nonrandomized multicenter study with a follow-up of 12 months. Study endpoints were device-related serious adverse events at 3 months, appropriate QRS detection in direct comparison with synchronized Holter ECG recordings, sensitivity and positive predictive value of arrhythmia detection in comparison with Holter ECG and independent of it, and noise burden during the entire follow-up period.

Results

The implantation was successful in all 152 patients. Two device-related serious adverse events (pocket infections) occurred by 3 months. The mean QRS amplitude of 0.3 ± 0.2 mV at implantation remained stable over 12 months. QRS sensing performance indicated little over- and undersensing in most patients. More than 80 % of the patients had more than 22 h of noise-free monitoring per day.

Conclusion

BioMonitor effectively detects patients with bradycardia, tachycardia, AF, or asystole. Active noise detection seems to reduce the transmission of meaningless data without diminishing the positive predictive value of the device.

Zusammenfassung

Zielsetzung

Ein neu entwickelter implantierbarer Herzmonitor (BioMonitor, Biotronik) mit der Option der kontinuierlichen Fernüberwachung wurde prospektiv bei Patienten mit vermuteten Arrhythmien oder zur Therapiekontrolle nach Vorhofflimmerablation implantiert. Das im Gerät integrierte 3‑Kanal-EKG sollte die Implantation flexibler bezüglich des Implantationsorts und der elektrischen Herzachse machen. Da Artefaktsensing ein häufiges Problem darstellt, wurde in das Gerät ein Algorithmus zur aktiven Artefakterkennung integriert. Ziel der Studie war es, die Funktionalität im klinischen Alltag zu prüfen.

Methoden

Diese multizentrische Studie erfolgte prospektiv nichtrandomisiert mit einem Follow-up von 12 Monaten. Studienendpunkte waren geräteassoziierte schwerwiegende unerwünschte Ereignisse („serious adverse events“, SAE) 3 Monate nach Implantation, korrekte QRS-Detektion im Vergleich zu synchronisierten Langzeit-EKGs, Sensitivität und positiv-prädiktiver Wert der Arrhythmiedetektion im Vergleich zu synchronisierten Langzeit-EKGs und unabhängig davon sowie die Artefaktlast während der gesamten Nachbeobachtungszeit.

Ergebnisse

Die Implantation verlief bei allen 152 Patienten erfolgreich. Es traten 2 geräteassoziierte SAE auf (Tascheninfektionen). Die mittlere QRS-Amplitude von 0,3 ± 0,2 mV bei Implantation blieb über 12 Monate stabil. Bezüglich des QRS-Sensings zeigte sich bei den meisten Patienten ein geringes Over- oder Undersensing. Über 80 % der Patienten wiesen eine artefaktfreie Überwachung von mindestens 22 h pro Tag auf.

Schlussfolgerungen

Der BioMonitor detektiert Bradykardien, Tachykardien inklusive Vorhofflimmern und Asystolien effektiv. Die aktive Artefakterkennung reduziert dabei die Übertragung nutzloser Daten, ohne den positiv-prädiktiven Wert der Arrhythmieerkennung zu verringern.

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Acknowledgements

The authors thank Frank Kleinjung for biostatistical support, Jürgen Schrader and Dejan Danilovic for editorial assistance, and last but not least Gundala Hermann for the project management of the whole study.

Funding

This work was supported by Biotronik SE & Co. KG, Berlin, Germany.

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Correspondence to J. Lauschke MD.

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Conflict of interest

J. Lauschke received speaker honoraria and consulting fees from Biotronik. M. Busch received speaker honoraria, consulting fees, and research grants from Biotronik. H. Nägele received research grants and speaker honoraria from Biotronik. D. Bänsch received speaker honoraria, consulting fees, and research grants from Biotronik. R. Schneider received consulting fees from Biotronik. W. Haverkamp, A. Bulava, D. Andresen, C. Israel, and G. Hindricks declare that they have no competing interest. Biotronik was involved in the study design, data collection and the analysis of the data.

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Lauschke, J., Busch, M., Haverkamp, W. et al. New implantable cardiac monitor with three-lead ECG and active noise detection. Herz 42, 585–592 (2017). https://doi.org/10.1007/s00059-016-4492-7

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  • DOI: https://doi.org/10.1007/s00059-016-4492-7

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