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Symptoms and Signs – Differential Diagnosis of Absence of Doll's Eye Sign [Negative oculocephalic reflex]
Rapid and gentle rotation of the patient's head from side to side is used to identify the lack of the doll's eye sign, which is an indication of brain stem dysfunction. The gaze remains stationary in the middle position, rather than the typical reaction of shifting laterally towards the side opposite to the direction of head rotation. Refer to the Section on Testing for Absent Doll's Eye Sign.
An absence of the doll's eye sign suggests damage to the midbrain or pons, specifically affecting cranial nerves III and VI. It commonly coexists with coma resulting from damage to the cerebellum and brain stem. The reliability of this sign is often questionable in a cognizant patient due to their ability to deliberately regulate eye movements. One essential requirement for diagnosing brain death is the absence of the doll's eye indication.
Abnormal doll's eye sign refers to a progressively developing version of the absent doll's eye sign. Impairment of conjugate eye movement results in lateral movement of one eye while the other eye remains stationary or moves in the opposite direction. An atypical doll's eye sign often occurs in conjunction with metabolic coma or elevated intracranial pressure (ICP). Concomitant impairment of the brain stem can either be reversed or advance to a more severe coma without the doll's eye indication.
Histories and Physical Assessment
Following the identification of a missing doll's eye sign, conduct a neurological assessment. Initial assessment of the patient's awareness state should be conducted using the Glasgow Coma Scale. Make note of the decerebrate or decorticate posture. Anatomically assess the pupils for dimensions, uniformity, and sensitivity to illumination. Screen for indications of elevated intracranial pressure (ICP) such as elevated blood pressure, rising pulse pressure, and bradycardia.
Guidelines for Examination
Assessing for the Absence of Doll's Eye Sign
When the patient is laying supine, assess her oculocephalic reflex by holding her upper eyelids open and rapidly (but delicately) rotating her head from one side to the other, observing eye movements with each rotation.
Where there is no doll's eye symbol, the eyes remain stationary in the middle position.
Medical etiology
Brain stem infarction
Brain stem infarction results in the absence of the doll's eye sign in patient with coma. In addition, it induces paralysis of the limbs, palsy of the cranial nerves (resulting in facial weakness, diplopia, blindness or visual field impairments, and nystagmus), bilateral ataxia of the cerebellum, varying degrees of sensory loss, a positive Babinski's reaction, decerebrate posture, and muscle flaccidity.
Brain stem tumor
Doll's eye sign absence is a characteristic feature of coma in brain stem tumors. The presence of this indication may be preceded by hemiparesis, nystagmus, extraocular nerve palsies, facial pain or sensory loss, facial paralysis, a reduced corneal reflex, tinnitus, hearing loss, difficulty swallowing, excessive salivation, vertigo, dizziness, lack of coordination, and vomiting.
Cerebral midbrain infarction
Other symptoms that may accompany the absence of doll's eye sign include coma, Weber's syndrome (characterized by oculomotor palsy with contralateral hemiplegia), contralateral ataxic tremor, nystagmus, and pupillary abnormalities.
Pontine hemorrhage
Pontine hemorrhage, a life-threatening condition, presents with the rapid development of absent doll's eye sign and coma within minutes. Additional foreboding indicators, such as total paralysis, decerebrate posture, a positive Babinski's reflex, and small, reactive pupils, might quickly advance to eventual death.
Posterior fossa hematoma
A subdural hematoma located at the posterior fossa usually results in the absence of the doll's eye sign and ultimately leads to coma. The aforementioned signs may be preceded by distinctive indications and symptoms, including headache, vomiting, somnolence, cognitive impairment, asymmetrical pupils, difficulty swallowing, palsy of the cranial nerves, cervical rigidity, and cerebellar ataxia.
Other Causes
Pharmaceuticals. Barbiturates elicit profound depression of the central nervous system, leading to coma and the absence of the doll's eye sign.
Points of Special Consideration
Do not try to evoke doll's eye sign in a comatose patient with suspected cervical spine injury; doing so risks injury to the spinal cord. Alternatively, assess the oculovestibular reaction using the cold caloric test. Ordinarily, the introduction of cold water into the ear induces a gradual movement of the eyelids towards the affected ear. The confirmation of an absent doll's eye indication may also be achieved by cold caloric testing.
Proceed with the ongoing surveillance of vital signs and neurological condition in the patient exhibiting an absent doll's eye sign.
Therapeutic Counseling for Patients
Elucidate to the patient's family the fundamental etiology of the patient's ailment, and foster inquiries upon possible therapeutic alternatives.
Guidelines for Pediatric Populations
Typically, the doll's eye sign rarely appears during the first 10 days after birth and may be inconsistent until the child reaches the age of 2. Following that, this sign consistently suggests the functioning of the brain stem.
An absence of the doll's eye sign in children may occur alongside coma caused by a head injury, near drowning or suffocation, or brain stem astrocytoma.
Rapid and gentle rotation of the patient's head from side to side is used to identify the lack of the doll's eye sign, which is an indication of brain stem dysfunction. The gaze remains stationary in the middle position, rather than the typical reaction of shifting laterally towards the side opposite to the direction of head rotation. Refer to the Section on Testing for Absent Doll's Eye Sign.
An absence of the doll's eye sign suggests damage to the midbrain or pons, specifically affecting cranial nerves III and VI. It commonly coexists with coma resulting from damage to the cerebellum and brain stem. The reliability of this sign is often questionable in a cognizant patient due to their ability to deliberately regulate eye movements. One essential requirement for diagnosing brain death is the absence of the doll's eye indication.
Abnormal doll's eye sign refers to a progressively developing version of the absent doll's eye sign. Impairment of conjugate eye movement results in lateral movement of one eye while the other eye remains stationary or moves in the opposite direction. An atypical doll's eye sign often occurs in conjunction with metabolic coma or elevated intracranial pressure (ICP). Concomitant impairment of the brain stem can either be reversed or advance to a more severe coma without the doll's eye indication.
Histories and Physical Assessment
Following the identification of a missing doll's eye sign, conduct a neurological assessment. Initial assessment of the patient's awareness state should be conducted using the Glasgow Coma Scale. Make note of the decerebrate or decorticate posture. Anatomically assess the pupils for dimensions, uniformity, and sensitivity to illumination. Screen for indications of elevated intracranial pressure (ICP) such as elevated blood pressure, rising pulse pressure, and bradycardia.
Guidelines for Examination
Assessing for the Absence of Doll's Eye Sign
When the patient is laying supine, assess her oculocephalic reflex by holding her upper eyelids open and rapidly (but delicately) rotating her head from one side to the other, observing eye movements with each rotation.
Where there is no doll's eye symbol, the eyes remain stationary in the middle position.
Medical etiology
Brain stem infarction
Brain stem infarction results in the absence of the doll's eye sign in patient with coma. In addition, it induces paralysis of the limbs, palsy of the cranial nerves (resulting in facial weakness, diplopia, blindness or visual field impairments, and nystagmus), bilateral ataxia of the cerebellum, varying degrees of sensory loss, a positive Babinski's reaction, decerebrate posture, and muscle flaccidity.
Brain stem tumor
Doll's eye sign absence is a characteristic feature of coma in brain stem tumors. The presence of this indication may be preceded by hemiparesis, nystagmus, extraocular nerve palsies, facial pain or sensory loss, facial paralysis, a reduced corneal reflex, tinnitus, hearing loss, difficulty swallowing, excessive salivation, vertigo, dizziness, lack of coordination, and vomiting.
Cerebral midbrain infarction
Other symptoms that may accompany the absence of doll's eye sign include coma, Weber's syndrome (characterized by oculomotor palsy with contralateral hemiplegia), contralateral ataxic tremor, nystagmus, and pupillary abnormalities.
Pontine hemorrhage
Pontine hemorrhage, a life-threatening condition, presents with the rapid development of absent doll's eye sign and coma within minutes. Additional foreboding indicators, such as total paralysis, decerebrate posture, a positive Babinski's reflex, and small, reactive pupils, might quickly advance to eventual death.
Posterior fossa hematoma
A subdural hematoma located at the posterior fossa usually results in the absence of the doll's eye sign and ultimately leads to coma. The aforementioned signs may be preceded by distinctive indications and symptoms, including headache, vomiting, somnolence, cognitive impairment, asymmetrical pupils, difficulty swallowing, palsy of the cranial nerves, cervical rigidity, and cerebellar ataxia.
Other Causes
Pharmaceuticals. Barbiturates elicit profound depression of the central nervous system, leading to coma and the absence of the doll's eye sign.
Points of Special Consideration
Do not try to evoke doll's eye sign in a comatose patient with suspected cervical spine injury; doing so risks injury to the spinal cord. Alternatively, assess the oculovestibular reaction using the cold caloric test. Ordinarily, the introduction of cold water into the ear induces a gradual movement of the eyelids towards the affected ear. The confirmation of an absent doll's eye indication may also be achieved by cold caloric testing.
Proceed with the ongoing surveillance of vital signs and neurological condition in the patient exhibiting an absent doll's eye sign.
Therapeutic Counseling for Patients
Elucidate to the patient's family the fundamental etiology of the patient's ailment, and foster inquiries upon possible therapeutic alternatives.
Guidelines for Pediatric Populations
Typically, the doll's eye sign rarely appears during the first 10 days after birth and may be inconsistent until the child reaches the age of 2. Following that, this sign consistently suggests the functioning of the brain stem.
An absence of the doll's eye sign in children may occur alongside coma caused by a head injury, near drowning or suffocation, or brain stem astrocytoma.
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