Right MCA Stroke Diagnosis and Management

Core Neurological Deficits

A right middle cerebral artery stroke produces left-sided motor and sensory deficits, left-sided neglect, abnormal visual-spatial ability, right monocular blindness, and right homonymous hemianopsia, according to the American Heart Association 1, 2
Left-sided hemiplegia or hemiparesis is the hallmark finding, affecting the face, arm, and leg contralaterally to the lesion, as stated by the American Stroke Association 3, 1
Left-sided paresthesia or sensory loss involving the entire left hemibody is a common finding, as reported by the American Heart Association 1, 2
The motor deficit is typically severe from onset in space-occupying MCA infarctions, according to the International Journal of Stroke 3
Right homonymous hemianopsia, a visual field loss affecting the right visual field in both eyes, is a characteristic finding, as stated by the American Heart Association 1, 2
Right eye monocular blindness may occur if the internal carotid artery is also involved, as reported by the American Heart Association 1, 2
Left-sided neglect is characteristic of right hemisphere strokes and represents inattention to the left side of space, according to the American Heart Association 1, 2
Abnormal visual-spatial ability distinguishes right from left MCA strokes, as stated by the American Heart Association 1, 2

Progressive headaches indicate developing cerebral edema, as reported by the International Journal of Stroke 3
Nausea and vomiting are both initial symptoms and predictors of malignant edema, according to the International Journal of Stroke 3
Impairment of consciousness progressing from alert to obtunded to comatose is a sign of clinical deterioration, as stated by the International Journal of Stroke 3
Ipsilateral pyramidal signs, such as right-sided weakness, suggest transtentorial herniation, according to the International Journal of Stroke 3
Pupillary dilation, typically ipsilateral, then bilateral, is a critical sign of herniation, as reported by the International Journal of Stroke 3

NIHSS ≥15 for right MCA strokes is a predictor of malignant course, as stated by the International Journal of Stroke 3
Nausea and vomiting at presentation are associated with a higher risk of malignant course, according to the International Journal of Stroke 3
History of hypertension or heart failure is a risk factor for malignant course, as reported by the American College of Cardiology 5
Elevated white blood cell count is a predictor of malignant course, according to the American College of Cardiology 5

The right MCA stroke is often underestimated in severity because neglect and visual-spatial deficits are more subtle than aphasia, leading to delayed recognition of malignant infarction, as stated by the International Journal of Stroke 3
Deterioration occurs rapidly between 12-72 hours post-stroke, with brain edema responsible for approximately one-third of clinical worsening cases, according to the International Journal of Stroke 3, 5