Loss of memory for events immediately following a trauma; sometimes in effect for events during and for a long time following the trauma WordNet 3.0 & Open English WordNet

Post-traumatic amnesia is a state of confusion that occurs immediately following a traumatic brain injury in which the injured person is disoriented and unable to remember events that occur after the injury. Wikipedia

In neurology, anterograde amnesia is the inability to create new memories after an event that caused amnesia, leading to a partial or complete inability to recall the recent past, while long-term memories from before the event remain intact. Wikipedia

State of confusion following a traumatic brain injury Wikipedia Disambiguation

Loss of the ability to create new memories after the onset of amnesia Wikidata

medical condition Wikidata

The inability to remember new information from the period beginning the amnesic episode. Wiktionary

Inability to remember new information. Wiktionary (translation)