Cardioverter Discharges Following Sensing of Electrical Artifact Due to Fluid Penetration in the Connector Port

Hief, C; Podczeck, A.; Frohner, K.; Nürnberg, Michael; Kaltenbrunner, W; Veit, Franz; Steinbach, K.

doi:10.1111/j.1540-8159.1995.tb06747.x

Cited by 8 publications

(1 citation statement)

References 7 publications

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“…There was no lead dysfunction previously reported in either case 14 7 No change in lead impedance was measured and no fracture or dislodgement was observed on chest radiographs. The conditions of occurrence were the same in both patients: a few days after implantation of the device, in a sitting position, during deep breathing, and during the Valsalva manoeuvre.…”

Section: Discussionmentioning

confidence: 78%

Inappropriate shocks delivered by implantable cardiac defibrillators during oversensing of activity of diaphagmatic muscle

Babuty

Fauchier

Cosnay

1999

Heart

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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. (Heart 1999;81:94-96) Keywords: implantable cardiac defibrillator; inappropriate shocks; myopotentials Delivery of inappropriate shocks by implantable cardioverter defibrillators (ICDs) is a common complication.1 2 The mostfrequent cause is the occurrence of supraventricular tachycardia that cannot be diVerentiated by the ICD from ventricular tachycardia. 1 2 Other causes are oversensing of T waves, pacing artefacts from a separate pacemaker, and noise from electronic devices, and lead damage. [1][2][3][4][5][6] We report, for the first time, inappropriate shock by oversensing of diaphragmatic muscular activity in two patients implanted with third and fourth generation ICDs. Case 1A 74 year old man with coronary heart disease and recurrent ventricular fibrillation refractory to amiodarone and blocker treatment received a pectoral ICD (Mini1763; CPI Inc, St Paul, Minnesota, USA) with a bipolar endocardial catheter (Endotak model 0125; CPI Inc) in the right ventricular apex. The intraoperatively sensed R wave amplitude was measured at 8 mV and the pacing threshold was 0.7 V at 0.5 ms pulse width. The ICD was programmed

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Section: Discussionmentioning

confidence: 78%