题目详情骨显像检查时，患者的一些注意事项目的：注射骨显像剂后应鼓励患者饮水500—1000ml以加速______________的清除。检查前应嘱患者排空膀胱，对排尿困难者给予导尿______________。对于伴发剧烈疼痛的骨转移患者以及年老体弱者应适当增加注射剂量，以缩短检查时间；对于因疼痛而不能平卧或出现强迫体位的患者，必要时给予镇痛剂，______________。检查前应除去患者衣物上的金属物品如硬币、金属夹，钥匙，项链等，并详细询问病史，______________。 请帮忙给出正确答案和分析，谢谢！
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