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Abstract Objective To study the ECG diagnosis of myocardial infarction in pacemaker implanted patients.Methods In our study, 24 pacemakerimplanted patients complicating myocardial infarction were selected from those treated in our hospital from October 2012 to October 2015. Two ECG diagnosis clinicians were arranged to analyze the ECGs of complicated myocardial infarction at different stages in patients implanted with different types of pacemakers. Results After implantation of pacemaker, the ECG characteristics of myocardial infarction at each stage will not be concealed when patients own ventricular beats were conducted downward. In the appearance of ventricular pacing, parts of T wave changes and Q waves in ST segment at myocardial infarction stage were concealed while parts were difficult to be distinguished. It was mainly decided by a variety of factors including the types of implanted pacemakers, pacing mode, sites of myocardial infarction, locations of implanted electrode and the stage of myocardial infarction, etc. Conclusion There are some special characteristics in ECGs of pacemakerimplanted patients complicated with myocardial infarction. To improve the accuracy of ECG diagnosis, it is required to combine diagnosis with clinical circumstances closely, monitor ECG changes dynamically and switch pacing mode when necessary.
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