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Abstract Objective To investigate the diagnostic value of 12 lead ambulatory electrocardiogram(AECG) for silent myocardial ischemia(SMI).Methods AECGs of 316 patients diagnosed with coronary heart disease were analyzed retrospectively. Results① The detection rate of STsegment depression by AECG was higher than that of electrocardiogram(ECG), and the difference was statistically significant (P<0.05).② The duration of STsegment depression in SMI was the longest during 06:0012:00, and the difference was statistically significant (P<0.05).③ The attack of SMI was fast frequencydependent, and comparing with the slow frequencydependent SMI, the difference was statistically significant (P<0.05). Conclusion Twelve lead AECG could be used to confirm the frequency, duration and evolution law of silent myocardial ischemia and provides an important basis for clinical diagnosis and prognostic observation of the disease.
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