Heart 1999;81:94-96 ( January )
Case report
Inappropriate shocks delivered by implantable cardiac
defibrillators during oversensing of activity of diaphagmatic muscle
Cardiology B
Department, Hospital Trousseau, 37044 Tours, France
Correspondence to: Dr Babuty.
Accepted for publication 24 June 1998
Two cases are reported (both men, one 72 and one 54 years
old) of inappropriate shocks delivered by an implantable cardiac defibrillator (ICD) device, which oversensed the myopotentials induced
by deep breathing and Valsalva manoeuvre. No damage to leads was
associated with the oversensing of myopotentials. The mechanism of the
inappropriate shocks was determined using real time electrograms.
Modification of the duration of ventricular detection and decrease in
sensitivity made it possible to avoid the oversensing of myopotentials
and to deliver ICD treatment.
© 1999 by Heart
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