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Abstract Objective Electrocardiogram(ECG) and vectorcardiogram(VCG) were collected by Wilson and Frank dual lead system. The diseases caused by left deviation of ECG axis were timely identified. Methods The symptomatic patients with left deviation of ECG were selected and their ECGs and VCGs were analyzed. Results Five cases were similar in ECG pattern, and all of them showed left axis deviation. But the performance and diagnosis of VCG were different. Conclusion VCG showed better performance in the diagnosis of diseases caused by left deviation of electrocardiogram axis compared to ECG. It should be careful when identify the diseases caused by left deviation of electrocardiogram axis without the help of VCG. We should combine the advantages of both ECG and VCG, to well serve the clinic application and improve the accuracy of diagnosis.
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