二尖瓣前叶M型曲线,其EF段下降速度正常为A.40~80cm/sB.60~100cm/sC.80~120cm/sD.100~140cm/s...

作者: rantiku 人气: - 评论: 0
问题 二尖瓣前叶M型曲线,其EF段下降速度正常为
选项 A.40~80cm/s B.60~100cm/s C.80~120cm/s D.100~140cm/s E.120~160cm/s
答案 C
解析 :正常人二尖瓣前叶曲线舒张期上升形成E、A两峰,两峰之间有一切迹即F点。当曲线达E峰后,随后迅速下降至F点形成EF段,下降速度80~120cm/s,为心室快速充盈后房室间压力差减小,二尖瓣前叶向后漂移所致。

猜你喜欢

发表评论
更多 网友评论0 条评论)
暂无评论
错误啦!

错误信息

  • 消息: [程序异常] : MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
  • 文件: /twcms/kongphp/cache/cache_redis.class.php
  • 位置: 第 85 行
    <?php echo 'KongPHP, Road to Jane.'; ?>