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Figure 3 Illustration of acute ST-segment changes and spontaneous ST-segment elevation myocardial infarction as recorded by implanted medical device. Tracings were obtained from telemetry from implantable cardiac device to external alerting device. (A) Shows stable normal sinus rhythm without ST-segment shift at baseline 30 h after medical device implant. (B) Heart rate-related (heart rate increase from 119 at baseline to 148 beats/min) ST-segment depression sets off a "see your physician" alert 13 h after copper stent implantation in the left anterior descending coronary artery. (C) ST-segment elevation is noted at 59 h after copper stent implantation, resulting in an "emergency" alert. (D and E) There are more frequent ventricular premature beats, leading to ventricular fibrillation 1 h after the initial ST-segment emergency alert (F). The animal passed away with an agonal rhythm 15 min after the initial ventricular fibrillation (G).
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