title: Accuracy of rhythm classification using a data log system in implantable cardioverter defibrillators.
abstract: Because the presence or absence of symptoms alone may be insufficient to correctly diagnose the rhythm for which implantable cardioverter defibrillator therapy is delivered, we hypothesized that the addition of data log information available in Telectronics ATP 4210 may improve the accuracy of rhythm classification. With this system the recorded ventricular electrogram cycle length is reported on a beat-to-beat basis immediately before, during, and after the tachyarrhythmia is detected. Using this information recorded from the data log in 32 separate tachyarrhythmia episodes in 20 patients, we compared the sensitivity, specificity, and predictive accuracy of rhythm classification on the basis of symptoms alone, data log alone, and data log combined with symptoms. While classification based on symptoms alone is highly specific (10/10 episodes), it is insensitive and has an overall predictive accuracy of 53%. By contrast, data log is sensitive (90%) and specific (91%) with better predictive accuracy (94%) than symptoms alone (P = 0.002). The addition of symptoms to information on beat-to-beat cycle length from data log resulted in a slight increase in predictive accuracy.
authors.affiliation: Department of Medicine, New England Medical Center Hospitals, Tufts University School of Medicine, Boston, Massachusetts.
authors.forename: P J
authors.initials: PJ
authors.lastname: Wang
authors.forename: N
authors.initials: N
authors.lastname: Mandalakas
authors.forename: C
authors.initials: C
authors.lastname: Clyne
authors.forename: L
authors.initials: L
authors.lastname: Butts
authors.forename: C
authors.initials: C
authors.lastname: Colburn
authors.forename: H
authors.initials: H
authors.lastname: Rastegar
authors.forename: N A
authors.initials: NA
authors.lastname: Estes
mesh_terms: D003625:Data Collection; D004554:Electric Countershock / Q000295:instrumentation*; D004562:Electrocardiography / Q000379:methods*; D004867:Equipment Design; D006801:Humans; D011237:Predictive Value of Tests; D019736:Prostheses and Implants; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013610:Tachycardia / Q000175:diagnosis* / Q000453:epidemiology / Q000628:therapy*; D014693:Ventricular Fibrillation / Q000175:diagnosis* / Q000453:epidemiology / Q000628:therapy*