The diagnostic value of three common primitive reflexes.

Area of Science:

• Neurology
• Clinical Neuroscience

Background:

• Primitive reflexes, such as the snout, palmomental, and corneomandibular reflexes, are typically absent in healthy adults.
• Their persistence or reappearance can indicate neurological impairment.

Purpose of the Study:

• To investigate the diagnostic value of eliciting snout, palmomental, and corneomandibular reflexes in patients with brain damage.
• To determine if combinations of these reflexes are more effective than individual reflexes in identifying neurological deficits.

Main Methods:

• Systematic elicitation of snout, palmomental, and corneomandibular reflexes.
• Study included 50 young patients with prolonged traumatic coma, 50 elderly hemiplegics post-cerebrovascular accident, and 100 age-matched healthy controls.

Main Results:

• No single reflex was significantly more frequent in brain-damaged patients compared to controls.
• Combinations of two or three reflexes demonstrated diagnostic value in differentiating between damaged and healthy individuals.
• The combination of all three reflexes was absent in all normal controls but present in 13% of brain-damaged subjects.

Conclusions:

• Individual primitive reflexes have limited diagnostic value for brain damage.
• Combinations of snout, palmomental, and corneomandibular reflexes, particularly the presence of all three, show potential as a diagnostic indicator for neurological impairment.