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During the onset of variant angina pectoris, careful observation of QRS-ST-T morphology of ECG is helpful to identify patients with high-risk arrhythmia, and ECG monitoring should be strengthened.

During the onset of variant angina pectoris, careful observation of QRS-ST-T morphology of ECG is helpful to identify patients with high-risk arrhythmia, and ECG monitoring should be strengthened.

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s 500 px 500 px 0.5
m 1000 px 1000 px 2
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xl 10000 px 10001 px 15

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