Assertion: pacemaker's lead | /r/HasProperty | needed
Facets:
value: for is called “biventricular
type: OTHER
Source sentences:
text: If only one lead is needed, it is placed inside the lower-right chamber (the right ventricle).
text: If two leads are needed, the other is placed in the upper-right chamber (the right atrium).
text: If a third lead is needed for what is called “biventricular pacing” for heart failure, the procedure may take up to three hours.