n. camera
misc. compartments
背景-胎儿房室传导阻滞罕见，但具有极高的病死率。
Background - Fetal atrioventricular (AV) block is an uncommon lesion with significant mortality.
他们可以产生“球阀”效应，引起房室瓣口间歇性关闭。
They can produce a "ball valve" effect by intermittently occluding the atrioventricular valve orifice.
以往的起搏器通常只有一根导线接入心脏四个房室中的一个。
Pacemakers used to have but a single lead, going to one of the heart’s four chambers.
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