A3型题患者女，48岁。确诊甲亢，放射性核素<img border="0" alt="" src="http://img.weimei168.com/uploads/upimg/20221202/11545052_0.gif">I治疗1周后突发高热、心慌。体格检查：T40℃，心率160次/分，心房颤动，呼吸急促，大汗淋漓，烦躁不安。实验室检查：血WBC↑，N↑，FT<img border="0" alt="" src="http://img.weimei168.com/uploads/upimg/20221202/11545052_0_1.gif">↑，FT<img border="0" alt="" src="http://img.weimei168.com/uploads/upimg/20221202/11545052_0_2.gif">↑，TSH↓。对其进行药物治疗时应首选