患者,男性,30岁,半年来阴囊局限性浸润肥厚,阴囊皱褶加深,有渗液,皲裂,结痂。伴有唇炎,舌炎,口角炎,面部有皮炎表现。给予激素外用制剂半月余,效果不显著。正确的诊断是() ["慢性阴囊湿疹","脂溢性皮炎","白塞综合征","特应性皮炎","维生素B2缺乏症"]
患儿3岁,患法洛四联症,拟行矫治术,术前心功能Ⅲ级。术前预防该患儿发绀性缺氧危象,不正确的是() ["A.普萘洛尔能防止漏斗部痉挛","B.普萘洛尔治疗后诱导更平稳","C.普萘洛尔治疗后,诱导时易引起心脏停搏","D.普萘洛尔应在术前24小时停药","E.手术室后发生危象,可给美托洛尔0.5~1mg"]
女性,50岁,患急性化脓性胆管炎,面色苍白,肢体湿冷,脉搏114次/分,血压11/9.33kPa(86/70mmHg),经大量快速输液后血压和脉搏无改善,测中心静脉压2.06kPa(21cmH2)。pH7.30。应采取的有效措施是()。 ["A.继续快速补液","用血管收缩剂","给强心药","纠正酸中毒","加大抗生素用量"]
利多卡因用于局部浸润麻醉时的常用浓度是()。 ["0.25%~0.75%","0.5%~1.0%","0.75%~1.25%","1.5%","2.0%"]
患儿3岁,患法洛四联症,拟行矫治术,术前心功能Ⅲ级。哪种麻醉诱导方法不妥() ["A.氯胺酮静脉麻醉","吸入七氟烷诱导","硫喷妥钠静脉麻醉","咪达唑仑静脉诱导","吸入恩氟烷诱导"]
简述正畸治疗过程中减少牙根吸收的措施。