What is the Oculocephalic maneuver

The oculocephalic reflex is performed by holding a patient’s eyelids open and moving their head from side to side. The examination should only be performed on patients with a stable cervical spine without c-spine precautions.

What is the Oculocephalic reflex?

The oculocephalic reflex develops within the first week of life and essentially represents a vestibulo-ocular reflex normally suppressed in a conscious individual that attempts to turn the head to fixate on an object. This test consists of the rapid rotation of the patient’s head in a horizontal or vertical direction.

What does negative doll's eyes mean?

Negative Doll’s eyes would stay fixed midorbit, so having negative “doll’s eyes” is a sign that a comatose patient’s brainstem is not intact. There is one very important contraindication of this examination – trauma of a cervical spine – because we could seriously injured patient.

What is the doll's eye maneuver?

Definition. The doll’s eye maneuver is executed by quickly turning the patient’s head horizontally from side to side or vertically up and down while holding the eyelids open.

What is conjugate gaze palsy?

A conjugate gaze palsy is inability to move both eyes together in a single horizontal (most commonly) or vertical direction.

Is Oculocephalic reflex normal?

A normal response is for the eyes to move in the direction opposite the head movement, such as looking left as you turn her head to the right. The oculocephalic reflex is absent if her eyes move in the same direction as her head or stay fixed at midline.

What causes doll eyes?

The doll’s eyes reflex, or oculocephalic reflex, is produced by moving the patient’s head left to right or up and down. When the reflex is present, the eyes of the patient remain stationary while the head is moved, thus moving in relation to the head.

What is partial gaze palsy?

Partial gaze palsy; gaze is abnormal in one or both eyes, but forced deviation or total gaze paresis is not present. Forced deviation, or total gaze paresis is not overcome by the oculocephalic maneuver.

How do you do a doll's eye reflex?

Typically the doll’s eyes reflex is elicited by turning the head of the unconscious patient while observing the eyes. The eyes will normally move as if the patient is fixating on a stationary object. If there is a negative doll’s eyes reflex then the eyes remain stationary with respect to the head.

What was the response of the pupil in the opposite eye?

The pupils are generally equal in size. They constrict to direct illumination (direct response) and to illumination of the opposite eye (consensual response). The pupil dilates in the dark.

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How is the corneal reflex tested?

The corneal reflex test (blink test) examines the reflex pathway involving cranial nerves V and VII. Classically the provider lightly touches a wisp of cotton on the patient’s cornea. This foreign body sensation should cause the patient to reflexively blink.

What is sixth nerve palsy?

Sixth nerve palsy occurs when the sixth cranial nerve is damaged or doesn’t work right. It’s also known as the abducens nerve. This condition causes problems with eye movement. The sixth cranial nerve sends signals to your lateral rectus muscle. This is a small muscle that attaches to the outer side of your eye.

What causes parinaud syndrome?

Anything that causes unusual swelling or pressure in your brain may cause Parinaud syndrome. The most common causes include: brain tumors in the midbrain region or pineal gland. stroke.

What is Opthalmoplegia?

ophthalmoplegia, also called extraocular muscle palsy, paralysis of the extraocular muscles that control the movements of the eye. Ophthalmoplegia usually involves the third (oculomotor), fourth (trochlear), or sixth (abducens) cranial nerves. Double vision is the characteristic symptom in all three cases.

How do you check brainstem reflexes?

1. a torch is shone into both eyes to see if they react to the light.
2. the eye, which is usually very sensitive, is stroked with a tissue or piece of cotton wool to see if it reacts.

Is doll's eye reflex normal?

The normal doll’s eyes reflex is NOT dependent on visual fixation of a stationary object, indeed it is present in comatose patients who are blind or in the dark.

What reflexes do coma patients have?

Fact facts on coma During a coma, a person does not react to external stimuli and they will not show normal reflex responses. Comatose patients do not have sleep-wake cycles. Reasons for a coma include intoxication, nervous system disease, metabolic disease, infections, or a stroke.

What is the cold caloric test used for?

This test stimulates your acoustic nerve by delivering cold or warm water or air into your ear canal. When cold water or air enters your ear and the inner ear changes temperature, it should cause fast, side-to-side eye movements called nystagmus.

What is doll's eye reflex in newborn?

The vestibulo-ocular reflex (VOR) is generally tested by turning the patient’s head on his/her long axis and observing for the doll’s eyes response(DOLL): the eyes deviate opposite to the direction of head rotation.

Which nerve is responsible for gag reflex?

The afferent limb of the reflex is supplied by the glossopharyngeal nerve (cranial nerve IX), which inputs to the nucleus solitarius and the spinal trigeminal nucleus. The efferent limb is supplied by the vagus nerve (cranial nerve X) from the nucleus ambiguus. All of these are located in the medulla.

Why is the blink reflex so fast?

The reflex occurs at a rapid rate of 0.1 seconds. The purpose of this reflex is to protect the eyes from foreign bodies and bright lights (the latter known as the optical reflex). The blink reflex also occurs when sounds greater than 40–60 dB are made.

What is a Marcus Gunn pupil?

Marcus Gunn pupil (MGP) is the term given to an abnormal pupil showing aberrant pupillary response in certain ocular disorders. In literature, the term is often used synonymously with Marcus Gunn phenomenon or relative afferent pupillary defect (RAPD). [1] After exposure to bright light, a normal pupil constricts.

What is Edinger Westphal nucleus?

The Edinger–Westphal nucleus (accessory oculomotor nucleus) is the parasympathetic pre-ganglionic nucleus that innervates the iris sphincter muscle and the ciliary muscle.

How do you examine a coma?

1. level of consciousness (Glasgow Coma Score — list the components; e.g. E4V5M6 = GCS 15)
2. the pattern of breathing.
3. size and reactivity of the pupils.
4. eye movements and oculovestibular responses.
5. motor responses (tone, reflexes and posturing)

What is upward gaze palsy?

The most common cause of vertical gaze palsy is damage to the top part of the brain stem (midbrain), usually by a stroke or tumor. In upward vertical gaze palsies, the pupils may be dilated. When people with this palsy look up, they have nystagmus. That is, their eye rapidly moves upward, then slowly drifts downward.

What is the difference between partial and complete hemianopia?

Partial hemianopia means the patient has no visual stimulus in one quadrant of the visual field. Complete hemianopia describes having no visual stimulus in half of their visual field. Determining partial or complete hemianopia is part of the National Institutes of Health Stroke Scale (NIHSS).

What is one and a half syndrome?

One-and-a-half syndrome is a syndrome characterized by horizontal movement disorders of the eyeballs, which was first reported and named by Fisher in 1967. It presents a combination of ipsilateral conjugate horizontal gaze palsy (one) and ipsilateral internuclear ophthalmoplegia (INO) (a half).

What part of the brain controls pupil constriction?

The hypothalamus is the control center for many homeostatic mechanisms. It regulates both autonomic function and endocrine function. The roles it plays in the pupillary reflexes demonstrates the importance of this control center.

What is true about somatic reflexes?

Somatic reflexes include all reflexes that stimulate skeletal muscles. An example of such a reflex is the rapid withdrawal of your foot from a piece of glass you have just stepped on.

What cranial nerve controls pupillary reflex?

The pupillary light reflex requires CN II, CN III, and central brain stem connections. Light shined in one eye stimulates retinal photoreceptors, and subsequently retinal ganglion cells, whose axons travel through the optic nerve, chiasm, and tract to terminate in the pretectum (pretectal nucleus).

Why are corneal reflex important?

The palpebral/corneal reflex is elicited by touching either the periocular skin (palpebral) or the cornea (corneal). This reflex is important to protecting the eye, and interference with it (e.g., facial paralysis, trigeminal palsy, local anesthesia) often results in severe ocular damage.