La. Nair et al., TRANSIENT DATA STREAM DISSOCIATION IN COMPUTERIZED DATA-ACQUISITION SYSTEM MASQUERADING AS A SENSING ABNORMALITY, PACE, 20(10), 1997, pp. 2500-2503
During testing of a CPI model 1715 ICD, an apparent sensing abnormalit
y was noted following shock delivery for VF. Close inspection of the r
ecording prior to the defibrillation attempt revealed that the surface
leads spontaneously lost 848 ms of data while the event marker was un
affected. Computer simulations revealed that an inadequate buffer size
for the amplified (surface ECG) data was the likely source of data lo
ss. It is important to recognize that a discordance between surface le
ads and event marker may represent an abnormality in the data acquisit
ion system and simulate an ICD or lead malfunction.