男,74岁,因劳累后气短、心悸1周入院。查体:颊部紫红色,口唇发绀,心尖部闻及舒张期杂音。若明确诊断,最佳检查是()。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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