Assertion: pacemaker's activity | /r/HasProperty | monitored
Facets:
Source sentences:
text: A single chamber pacemaker with the lead placed in the right ventricle is used when the atrial activity does not need to be monitored but the rate of the ventricular activity needs to be managed, as in the case of chronic atrial fibrillation where the atrial activity cannot be controlled by pacing as atrial fibrillation is a rapid rhythm that overrides sinus rate.