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27 February 2019 : Case report  USA

Malignant Middle Cerebral Artery Infarction Due to Hyponatremia Following Traumatic Brain Injury: A Case Report

Unusual clinical course, Mistake in diagnosis, Unusual or unexpected effect of treatment, Diagnostic / therapeutic accidents, Educational Purpose (only if useful for a systematic review or synthesis)

Chompunut Asavaaree1ABCDEFG, Jenny Mao2ABCDEFG, Amanpreet Kaur2ABCDEFG, Saksith Smithason3ABCDEFG*

DOI: 10.12659/AJCR.913872

Am J Case Rep 2019; 20:258-262

Abstract

BACKGROUND: Development of syndrome of inappropriate antidiuretic hormone secretion or cerebral salt wasting has been commonly noted in post-traumatic brain injury, and this condition may lead to hyponatremia resulting in cerebral edema and possible cerebral herniation. However, the predominant topographic pattern of edema from hyponatremia has not been well documented. Unlike numerous reports on hyponatremia and vasospasm following aneurysmal subarachnoid hemorrhage, the data for traumatic brain injury patient are still limited. We report on a rare patient with malignant middle cerebral artery infarction as a result of hyponatremia following traumatic brain injury.

CASE REPORT: A 60-year-old Native American male with significant past medical history of alcoholism, hypertension, and hemorrhagic stroke presented to the emergency department by emergency medical service after he was struck by a vehicle in a hit-and-run incident. The patient sustained multiple abrasions, and he had elevated alcohol levels. His initial Glasgow Coma Score (GCS) was 14 with a confused conversation (V4). Computer tomography (CT) of the head showed 5 mm thickness acute subdural and subarachnoid hemorrhage of right frontal, temporal, and parietal areas, with 3 mm midline shift at the level of foramen of Monro. Traumatic brain injury conservative treatment was initiated as well as alcoholic withdrawal protocols in the intensive care unit. Patient initially improved neurologically despite low sodium levels. He recouped to fully conscious, with a GCS score of 15, at 24 hours after admission. On day 9, he was found unresponsive with a head CT showed malignant right middle cerebral artery infarction, resulted in 15 mm subfalcine herniation. The patient passed away 48 hours later, as patient’s family declined further intervention.

CONCLUSIONS: The management and prevention of post-traumatic vasospasm may be complicated even in asymptomatic and neurologically intact patients. Close neurological monitoring and prevention protocols are important in activating appropriate management.

Keywords: Brain Injuries, Hyponatremia, Subarachnoid Hemorrhage, Traumatic, Vasospasm, Intracranial, Brain Injuries, Traumatic, Fatal Outcome, Infarction, Middle Cerebral Artery

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American Journal of Case Reports eISSN: 1941-5923
American Journal of Case Reports eISSN: 1941-5923