Abstract
A pseudotachycardia was produced by a worn motor in a Holter recorder. This malfunction concealed an extreme bradycardia that was identified by simultaneous telemetry monitoring. Shortly thereafter, two other recorders purchased at the same time developed motor wear. In two of the three cases, motor failure was indicated by recorder noises. The artifactual nature of the pseudotachycardia was identified by the intermittent loss of voltage and compression of the ECG complexes in time that occurred during these intervals. Unrecognized artifacts in Holter monitor recordings may have serious adverse effects on both diagnosis and treatment. Potential causes of pseudoarrhythmia and methods for prevention and identification are reviewed. ( JAMA 1981;245:2427-2428)
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