StdTTP is reciprocal in regions with and without ischemic injury. An stdTTP >/=7 seconds (regular range) is strongly correlated with resulting infarct and reflects critical perfusion with a high probability of ischemic tissue injury in acute ischemia, whereas this is unlikely in regions with stdTTP </=3.5 seconds (regular range). An stdTTP of 3.5-7 seconds is equivocal concerning ischemic injury and may indicate a tolerable perfusion condition.
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