title: Initial clinical experience with a dual chamber rate responsive implantable cardioverter defibrillator.
abstract: The present study reports the first clinical experience with the Photon DR dual chamber rate responsive ICD. Fifty-seven patients (mean age 67.6 +/- 10 years) with a mean LVEF of 0.332 in NYHA Class I (30%), II (51%), or III (19%) met the implant criteria. Tachyarrhythmia diagnoses included VF (21%), VT (49%), or VT/VF (30%). Additional bradycardia pacing diagnoses included AV block (18%), sinus node dysfunction (5%), and sinus bradycardia (11%). All patients were followed on a long-term basis. A device-based direct current fibrillator (DC fibber) successfully induced VF in 96.2% of 243 attempted inductions. Detection times (2.86 +/- 0.47 s) and redetection times (1.29 +/- 0.32 s) compared favorably with historic controls using a morphology detection (MD) clinical data. Defibrillation energy and voltage thresholds were 10.4 +/- 5.5 J (range 3-28) and 421 V +/- 108 (range 230-696), respectively. Ninety-two clinical arrhythmias were recorded. Using a nominal nonindividualized algorithm, the sensitivity for VT detection was 100% and specificity for SVT rejection 81%. There were six patient deaths (2 nonsudden arrhythmic, 2 cardiac, 2 other). In conclusion, early clinical experience with the Photon DR ICD supports its safety, efficacy, and ability to provide advanced dual chamber ICD features.
authors.affiliation: rluceri@mediaone.net
authors.forename: R M
authors.initials: RM
authors.lastname: Luceri
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D001919:Bradycardia / Q000628:therapy*; D017147:Defibrillators, Implantable / Q000009:adverse effects; D004869:Equipment Safety; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D012684:Sensory Thresholds; D015996:Survival Rate; D013617:Tachycardia, Supraventricular / Q000628:therapy*; D017180:Tachycardia, Ventricular / Q000628:therapy*; D014693:Ventricular Fibrillation / Q000628:therapy*