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For the MI to cause the PC would
have been ruled out by the normal LAP without the time relations.
Temporal reasoning makes this hypothesis possible. Since the onset for
high LAP is zero and the max-exist is unspecified, the only causal
constraint is the persistence of PC. Applying the rules as above:
However, this time interval is constrained by the existing time interval
in which high LAP is false. Multiple time intervals for a node have to
have a strict time ordering. By default they are assumed to be abutting
unless there is some reason to infer an additional change in between.
These time intervals are reconciled by adjusting the early begin and
late end times:
- high LAP
then normal LAP
- high LAP
then normal LAP
The result captures the fact that the LAP is now normal but was high
within the last day.
The high LAP needs further explanation, since it is not a primary node.
There are two possible explanations: either the low LVF ended before
now, or the high LAP was corrected by the nitroglycerin.