普萘洛尔的药理作用是
A．增加冠状动脉血流量
B．降低心肌收缩力
C．加速心脏传导
D．降低呼吸道阻力
E．增加糖原分解
参考答案：B
解析： 本题考查普萘洛尔的药理作用。 普萘洛尔是最早应用于临床的β受体阻断剂。它可以用于治疗高血压、心绞痛、甲亢、心律失常。但由于用药时心脏β受体被阻断，引起心率减慢、传导减慢等心脏抑制，会加重房室传导阻滞。
The friendship between us never fades. Mary Allen was my best friend—like a sister I never had. We did everything together: piano lessons, movies, swimming, horseback riding, and so on. When I was 13, my family moved. Mary and I 36 in touch through letters, and we saw each other on special 37 — like my wedding and Mary’s. Soon we were 38 with children and moving to new homes, and we wrote less. One day a card that I sent came back, 39 “Address Unknown.” I had no idea how to 40 Mary. Over the years, I thought of Mary often. I wanted to 41 stories of my children and then grandchildren. I need to share my 42 when my brother and then my mother died. There was an empty place in my heart that only a friend like Mary could 43 . One day I was reading a newspaper 44 I notice a picture of a young woman who looked a lot like Mary and whose last name was Wagman— Mary’s married name. “There must be thousands of Wagmans,” I thought, 45 I wrote to her anyway. She called as soon as she got my letter. “Mrs. Tobin!” she said excitedly, “Mary Allen Wagman is my mother”. Minutes later I heard a voice that I 46 at once, even after 40 years. We laughed and cried and asked about each other’s 47 . Now the empty place in my heart is filled, and there is one thing that Mary and I know for sure: We won’t lose each other again!
|