Accuracy of the ambulatory ECG monitoring system CardioData Mk 4 in detecting exercise-induced myocardial ischaemia

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Abstract
The accuracy of ST-segment analysis in a direct-recording ambulatory ECG monitoring (AEGG) system (CardioData Mk. 4 with recorder CardioData PR3) was compared with that obtained in a standard ECG recorder. Twenty two patients with coronary heart disease and a positive exercise test were submitted to a second bicycle exercise test with concomitant AECG monitoring. Application of a junction box made it possible to record the two bipolar AECG leads simultaneously on both standard ECG (leads ECG 1 and 2) and AECG (leads AECG 1 and 2). The authors determined the time of the beginning, end and maximum and the magnitude of the ST segment depression in bipolar leads AECG 1 and 2, and ECG 1 and 2. AECG monitoring was just as accurate as standard ECG: time intervals between the different leads showed good alignment. The degree of maximum ST-segment depression in ECG 1 (mean+or-SD:0.22+or-0.11 mV) was identical to that in AECG 1 (0.22+or-0.13 mV). Maximum extent of ST-segment depression was lower in ECG 2 and AECG 2 but also comparable (ECG 2:0.13+or-0.14 mV, AECG 2:0.15+or-0.17 mV). Thus, ST-segment depressions found with a standard ECG recorder can also be reliably detected with a direct recording AECG monitoring system.