Skip to main content


Swipe om te navigeren naar een ander artikel

24-09-2018 | Original Article | Uitgave 12/2018 Open Access

Netherlands Heart Journal 12/2018

Device updates successfully reduce T‑wave oversensing and inappropriate shocks in subcutaneous ICD patients

Netherlands Heart Journal > Uitgave 12/2018
R. Larbig, L. J. Motloch, M. Bettin, A. Fischer, N. Bode, G. Frommeyer, A. Loeher, J. Koebe, F. Reinke, L. Eckardt
Belangrijke opmerkingen
The Authors R. Larbig and L. J. Motloch contributed equally to the manuscript.



To analyse the impact of device and software updates on the prevention of T‑wave oversensing (TWOS) and inappropriate shocks (IS) in subcutaneous ICD (S-ICD) patients.


TWOS is a feared complication after implantation. It may lead to harmful IS. To date, specific strategies to reduce these events are lacking.


In this retrospective single-centre trial we analysed 146 S‑ICD patients who were implanted between 2010 and 2016. In all eligible consecutive patients (n = 139), follow-up of at least 6 weeks was studied. The incidence of TWOS/IS was analysed in patients receiving a 2nd generation S‑ICD (Emblem-S-ICD) between 2014 and 2016 (Emblem). Their outcome was compared with a control group (SQ) treated with the SQ1010 device between 2010 and 2014, who were followed up for a maximum of 2 years. Furthermore, to test if the software update SMR8 reduces inappropriate shocks in the SQ1010-S-ICD population, the incidence of TWOS/IS was evaluated before and after update installation.


Basic characteristics and indications for S‑ICD implantation were similar in both groups. However, the cumulative incidence of TWOS/IS was significantly decreased in Emblem vs. SQ (SQ: 15.4%, n = 14/91 vs. Emblem 4.2%, n = 2/48; p = 0.049). Furthermore, with regards to the SQ population we also observed a trend towards a significant reduction of TWOS/IS after installation of the software update SMR8 in 2014 (before update: 13.4%, n = 11/82 vs. after update: 4.6%, 3/65, p = 0.07).


2nd generation devices but probably also the SMR8 software update reduce the incidence of TWOS/IS in S‑ICD patients.

Onze productaanbevelingen

Netherlands Heart Journal

Het Netherlands Heart Journal wordt uitgegeven in samenwerking met de Nederlandse Vereniging voor Cardiologie en de Nederlandse Hartstichting. Het tijdschrift is Engelstalig en wordt gratis beschikbaa ...

Over dit artikel

Andere artikelen Uitgave 12/2018

Netherlands Heart Journal 12/2018 Naar de uitgave

Rhythm Puzzle – Answer

Worth one’s salt