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European Heart Journal 1988 9(8):906-912;
Copyright © 1988 by the European Society of Cardiology.
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© 1988 The European Society of Cardiology

Tracker—an ambulatory recorder of ST-segment monitoring?

D. TAYLER and D. OAKLEY

Cardiac Department, Northern General Hospital Sheffield, U.K.

Received 27 October 1986; revised 21 January 1988; .

Address for reprints and correspondence: David Tayler, 225 Ringinglow Road, Bents Green, Sheffield s11 7PT, U.K.

Abstract

If ST-segment shifts are markers for ischaemic heart disease, they must be recorded accurately so that reliable diagnoses may be made. It is important to establish whether ST segments are distorted when recorded with ambulatory recorders. The Tracker/Replay II system (Reynolds Medical Ltd) is a machine widely used in Europe, yet little has been published assessing its performance when recording ST segments. We have therefore Europe, yet little has been published assessing its performance when recording ST segments. We have therefore investigated the Tracker/Replay II system using electrocardiograms from patients with ischaemic heart disease and synthesized test signals to see if it could accurately reproduce ST-segment levels. We found that when recording QRS complexes at the upper limit of normal (2mV and 110 ms), significant (0.14mV) artefactual ST-segment changes were produced. The distortion was less for narrower or smaller complexes.

Key Words: Distortion • ST segments • ambulatory recorders • ischaemia.


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