Facial changes after stroke
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Facial Paralysis and Asymmetry After Stroke
Facial paralysis, also known as facial paresis or central facial paresis (CFP), is a common result of stroke. It often leads to visible facial asymmetry, especially between the two sides of the face, and can significantly affect daily activities such as chewing, swallowing, and speaking 479. The paralysis is usually more pronounced in the lower face, and patients may experience sagging or weakness, particularly at the corner of the mouth 136. In some cases, weakness of eye closure (WEC) can also occur, which is associated with more severe facial paralysis and predicts a worse long-term outcome .
Changes in Facial Movement and Muscle Function
After a stroke, patients typically show reduced facial muscle strength and movement. This includes impaired ability to smile, reduced lip force, and difficulty with facial expressions 1367. Studies using functional scales and video analysis have shown that targeted therapies, such as orofacial therapy and mirror therapy, can improve facial muscle ability and movement over time 16. Improvements are often measured by the distance between the corner of the mouth and the earlobe during rest and smiling, as well as by specific muscle activation patterns 13.
Blood Flow and Facial Skin Changes
Stroke can also affect facial skin blood flow, particularly on the side of the face impacted by paralysis. Research using laser speckle contrast imaging has shown that interventions like peripheral magnetic stimulation (PMS) can increase blood flow in specific facial regions, which may support recovery and improve facial function .
Impact on Quality of Life and Mental Health
Facial changes after stroke are not just physical—they also have a strong impact on mental health and quality of life. Patients with facial paresis often experience reduced oral health-related quality of life (OHRQoL) due to difficulties with eating, speaking, and social interactions 37. There is a close correlation between improvements in facial movement and better mental health, including reduced depression . Rehabilitation that focuses on facial muscles can help improve both physical function and emotional well-being 137.
Cognitive and Emotional Facial Recognition Impairments
Stroke can impair the ability to recognize facial emotions, especially if the insula region of the brain is affected. Patients may have difficulty identifying emotions like fear, anger, and happiness in others' faces, which can further impact social interactions . Additionally, those with post-stroke depression may show early deficits in face perception and recognition, as measured by neuroelectrophysiological tests .
Advances in Detection and Monitoring
New technologies, such as deep learning models and facial image analysis, are being developed to detect and monitor facial weakness after stroke. These tools can help identify subtle facial asymmetries and track recovery progress, making rehabilitation more targeted and effective 49.
Conclusion
Facial changes after stroke are common and can include paralysis, asymmetry, reduced muscle strength, and impaired facial expression. These changes affect not only physical function but also mental health and quality of life. Rehabilitation therapies focused on facial muscles, as well as new technological tools for detection and monitoring, are showing promise in improving outcomes for stroke survivors 1234+6 MORE.
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Most relevant research papers on this topic
The Facial Skin Blood Flow Change of Stroke Patients with Facial Paralysis after Peripheral Magnetic Stimulation: A Pilot Study
Peripheral magnetic stimulation (PMS) can potentially increase facial skin blood flow in stroke patients with facial paralysis.
Weakness of Eye Closure with Central Facial Paralysis after Unilateral Hemispheric Stroke Predicts a Worse Outcome.
Weakness of eye closure (WEC) in unilateral stroke patients predicts a worse functional outcome at 180 days, with severe central facial paralysis and right hemispheric stroke as potential predictors.
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