患者,女性,62岁。心前区剧烈疼痛2h入院。患者恶心、呕吐、烦躁,大汗淋漓,经休息和含服硝酸甘油后疼痛未见缓解。患者病情尚不稳定,提示可能发生室颤的心律失常是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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