Assertion: ablation's risk | /r/HasProperty | high
Facets:
Source sentences:
text: The physician uses electrical mapping, such as electrocardiogram (ECG) recording, and a catheter-localization system somewhat like Global Positioning Systems (GPS), to define areas of the heart that need ablation while safely avoiding areas where risk of complication is high.
text: Indeed, there are often many trigger sites and some are deep inside the veins, and therefore, they are difficult to reach or the risk of trauma to the veins is high.