hemianesthesia
Pronunciation: HEM-ee-an-es-THEE-zee-ah
Loss of sensation on one side of the body, typically resulting from brain injury affecting the contralateral sensory pathways.
Full Definition
Hemianesthesia is a neurological condition characterized by complete or partial loss of sensation (touch, pain, temperature, vibration, and proprioception) on one side of the body. This condition typically results from damage to the contralateral thalamus, sensory cortex, or sensory pathways in the brain, commonly following stroke, traumatic brain injury, or other neurological lesions. The sensory loss usually affects the face, arm, and leg on the same side and can significantly impact functional activities, safety awareness, and rehabilitation outcomes. Patients may be unaware of the affected side, leading to increased risk of injury. Assessment involves systematic sensory testing using various modalities, and rehabilitation focuses on compensation strategies, safety education, and sensory re-education techniques. The condition may improve over time with appropriate intervention and neuroplasticity-based approaches.
Usage
Usage note: Distinguish from hemianopia (visual field loss) and hemiparesis (motor weakness); specify affected sensory modalities.
In Context
- "The patient demonstrated complete hemianesthesia on the right side, requiring comprehensive safety education and compensatory strategies." — Occupational therapy evaluation