PREPU: Ch. We 60 Assessment of Neurologic Function

Which occurs when reflexes are hyperactive when the foot is abruptly dorsiflexed?

Clonus Explanation: Clonus occurs when the foot is abruptly dorsiflexed. It continues to "beat" two or three times before it settles into a position of rest. Sustained clonus always indicates the present of central nervous system disease and requires further evaluation. Ataxia is incoordination of voluntary muscle action. Rigidity is an increase in muscle tone at rest characterized by increased resistance to passive movement. Flaccid posturing is usually the result of lower brain stem dysfunction; the client has no motor function, is limp, and lacks motor tone.

The provider orders the Romberg test for a patient. The nurse tells the patient that the provider wants to evaluate his equilibrium by assessing which cranial nerve?

VIII Explanation: Cranial nerve VIII (acoustic) can be checked to assess equilibrium status.

A critical care nurse is documenting the assessment of a client. The client is status postresection of a brain tumor. The nurse documents that the client is flaccid on the left. This means that the client:

is not responding to stimuli. Explanation: Flaccidity is when the client has no motor response to stimuli. Flaccidity is a motor assessment.

A nurse is caring for a client with an injury to the central nervous system. When caring for a client with a spinal cord insult that is slowing transmission of the motor neurons, in what would the nurse anticipate a delayed reaction?

Response due to interrupted impulses from the central nervous system

The nurse is completing the physical assessment of a patient suspected of a neurologic disorder. The patient reports to the nurse that he has recently suffered a head trauma. In such a case, which of the following precautions should the nurse take for the patient? SATA.

The nurse should not move or manipulate the patient's head while assessing for bleeding or swelling. The nurse evaluates the patient's body posture and any abnormal position of the head, neck, trunk, or extremities. The nurse carefully examines the head for bleeding, swelling, or wounds. The nurse does not move or manipulate the patient's head during physical assessment, especially if there is a recent history of trauma. The nurse should not make the patient sit on a chair or seek the help of an assistant while doing the head assessment. The nurse need not explain in detail about the procedure of head assessment to the patient.

The nurse has completed evaluating the client's cranial nerves. The nurse documents impairment of the right cervical nerves (CN IX and CN X). Based on these findings, the nurse should instruct the client to

refrain from eating or drinking for now. Explanation: Significant findings of CN IX (glossopharyngeal) include difficulty swallowing (dysphagia) and impaired taste, and significant findings of CN X (vagus) include weak or absent gag reflex, difficulty swallowing, aspiration, hoarseness, and slurred speech (dysarthria). Based on these findings, the nurse should instruct the client to refrain from eating and drinking and should contact the health care provider. The other instructions are associated with abnormalities of CN II (optic) and CN VIII (acoustic).

Lesions in the temporal lobe may result in which type of agnosia?

Auditory Explanation: Lesions in the temporal lobe (lateral and superior portions) may result in auditory agnosia. Lesions in the occipital lobe may result in visual agnosia. Lesions in the parietal lobe may result in tactile agnosia. Lesions in the parietal lobe (posteroinferior regions) may result in relationship and body part agnosia.

There are 12 pairs of cranial nerves. Only three are sensory. Select the cranial nerve that is affected with decreased visual fields.

Cranial nerve II Explanation: The three sensory cranial nerves are I, II and VIII. Cranial nerve II (optic) is affected with decreased visual fields and acuity.

Which of the following is a sympathetic nervous system effect?

Decreased peristalsis Explanation: Sympathetic effects of the nervous system include decreased peristalsis, increased blood pressure, dilated pupils, and dilated bronchioles.

A client has undergone a lumbar puncture as part of a neurological assessment. The client is put under the care of a nurse after the procedure. Which important postprocedure nursing intervention should be performed to ensure the client's maximum comfort?

Encourage the client to drink liberal amounts of fluids Explanation: The nurse should encourage the client to take liberal fluids and should inspect the injection site for swelling or hematoma. These measures help restore the volume of cerebrospinal fluid extracted. The client is administered antihistamines before a test only if he or she is allergic to contrast dye and contrast dye will be used. The room of the client who has undergone a lumbar puncture should be kept dark and quiet. The client should be encouraged to rest, because sensory stimulation tends to magnify discomfort.

What is the function of cerebrospinal fluid (CSF)?

It cushions the brain and spinal cord. Explanation: CSF is produced primarily in the lateral ventricles of the brain. It acts as a shock absorber and cushions the spinal cord and brain against injury caused by sudden or extreme movement. CSF also functions in the removal of waste products from cerebral tissue. CSF doesn't act as an insulator or a barrier and it doesn't produce cerebral neurotransmitters.

A critical care nurse is documenting her assessment of a client she is caring for. The client is status post-resection of a brain tumor. The nurse documents that the client is flaccid on the left. What does this mean?

The client is not responding to stimuli. Explanation: Flaccidity is when the client makes no motor response to stimuli. Flaccidity is a motor assessment.

A client has sustained a head injury to the parietal lobe and cannot identify a familiar object by touch. The nurse knows that this deficit is

Astereognosis Explanation: Astereognosis is the inability to identify an object by touch. Visual agnosia is the loss of ability to recognize objects through visualizing them. The Romberg test has to do with balance. Ataxia is defined as incoordination of voluntary muscle action.

Which term describes the fibrous connective tissues that cover the brain and spinal cord?

Meninges Explanation: The meninges have three layers: the dura mater, arachnoid mater, and pia mater. The dura mater is the outermost layer of the protective covering of the brain and spinal cord. The arachnoid is the middle membrane, and the pia mater is the innermost membrane of this protective covering.

The nurse is performing a neurologic assessment on a client diagnosed with a stroke and cannot elicit a gag reflex. This deficit is related to which of the following cranial nerves?

X CN X is the vagus nerve and has to do with the gag reflex, laryngeal hoarseness, swallowing ability, and the symmetrical rise of the uvula and soft palate. CN VII is the facial nerve and has to do with symmetry of facial movements and the ability to discriminate between the tastes of sugar and salt. The inability to close one eyelid indicates impairment of this nerve. CN VIII is the acoustic nerve. It has to do with hearing, air and bone conduction, and balance. CN III is the oculomotor nerve and has to do with pupillary response, conjugate movements, and nystagmus.

A nurse is caring for a client who has a history of a cerebral aneurysm. Which diagnostic test does the nurse anticipate to monitor the status of the aneurysm?

cerebral angiography Explanation: The nurse would anticipate a cerebral angiography, which detects distortion of the cerebral arteries and veins . A milligram detects abnormalities of the spinal canal. An electroencephalogram records electrical impulses of the brain. An echoencephalography is an ultrasound of the structures of the brain.

A patient who has suffered a stroke is unable to maintain respiration and is intubated and placed on mechanical ventilator support. What portion of the brain is most likely responsible for the inability to breathe?

Brain stem Explanation: The brain stem consists of the midbrain, pons, and medulla oblongata (see Fig. 65-2). Portions of the pons help regulate respiration. Motor fibers from the brain to the spinal cord and sensory fibers from the spinal cord to the brain are located in the medulla. Reflex centers for respiration, blood pressure, heart rate, coughing, vomiting, swallowing, and sneezing are located in the medulla.

A client is waiting in a triage area to learn the medical status of family members following a motor vehicle accident. The client is pacing, taking deep breaths, and handwringing. Considering the effects in the body systems, what does the nurse anticipate the liver will do?

Convert glycogen to glucose for immediate use. Explanation: When the body is under stress, the sympathetic nervous system is activated readying the body for action. The effect of the body is to mobilize stored glycogen to glucose to provide additional energy for body action.

A patient is having a lumbar puncture and the physician has removed 20 mL of cerebrospinal fluid. What nursing intervention is a priority after the procedure?

Have the patient lie flat for 6 hours. Explanation: Post-lumbar puncture headache may be avoided if a small-gauge needle is used and if the patient remains prone after the procedure. When more than 20 mL of CSF is removed, the patient is positioned supine for 6 hours (Bader & Littlejohns, 2010).

The nurse is assessing the throat of a client with throat pain. In asking the client to stick out the tongue, the nurse is also assessing which cranial nerve?

Cranial nerve XII Explanation: Assessment of the movement of the tongue is related to cranial nerve XII, the hypoglossal nerve. Cranial nerve I is the olfactory nerve. Cranial nerve V is the trigeminal nerve responsible for sensation to the face and chewing. Cranial nerve XI is the spinal or accessory nerve responsible for head and shoulder and shoulder movement.

A client who was found unconscious at home is brought to the hospital by a rescue squad. In the intensive care unit, the nurse checks the client's oculocephalic (doll's eye) response by:

turning the client's head suddenly while holding the eyelids open. Explanation: To elicit the oculocephalic response, which detects cranial nerve compression, the nurse turns the client's head suddenly while holding the eyelids open. Normally, the eyes move from side to side when the head is turned; in an abnormal response, the eyes remain fixed. The nurse introduces ice water into the external auditory canal when testing the oculovestibular response; normally, the client's eyes deviate to the side of ice water introduction. The nurse touches the client's cornea with a wisp of cotton to elicit the corneal reflex response, which reveals brain stem function; blinking is the normal response. Shining a bright light into the client's pupil helps evaluate brain stem and cranial nerve III function; normally, the client's pupil responds by constricting.

A client is weak and drowsy after a lumbar puncture. The nurse caring for the client knows that what priority nursing intervention should be provided after a lumbar puncture?

Position the client flat as directed. Explanation: A client who has undergone a lumbar puncture should be positioned flat and given hydrating fluids. These measures help restore the cerebrospinal fluid volume extracted from the client and are priority activities. The nurse should assess the LOC or the pupil response of the client after a lumbar puncture. Parenteral administration of caffeine sodium benzoate may offset cerebral vasodilation. Analgesic agents do not need to be avoided; along with hydration and rest, analgesic agents help provide comfort to patients who have undergone a lumbar puncture.

The cerebral circulation receives approximately what percentage of the cardiac output?

15% Explanation: The cerebral circulation receives approximately 15% of the cardiac output, or 750 mL per minute.

A nurse is performing a neurologic assessment on the client and notes a positive Romberg test. This test for balance is related to which of the following cranial nerves?

VIII Explanation: CN VIII is the acoustic nerve. It has to do with hearing, air and bone conduction, and balance. CN X is the vagus nerve and has to do with the gag reflex, laryngeal hoarseness, swallowing ability, and the symmetrical rise of the uvula and soft palate. CN III is the oculomotor and has to do with pupillary response, conjugate movements, and nystagmus. CN VII is the facial nerve and has to do with symmetry of facial movements and the ability to discriminate between the taste of sugar and salt.

A nurse is discussing a lumbar puncture with a nursing student who observed the procedure. The student noticed that the cerebrospinal fluid was blood tinged and asks what that means. The correct reply is which of the following?

"It can mean a traumatic puncture or a subarachnoid bleed." Explanation: The needle is inserted below the level of the spinal cord, which prevents damage to the cord. The cerebral spinal fluid (CSF) should be clear and colorless. Pink or bloody CSF may indicate a subarachnoid bleed or local trauma from the puncture. The hypothalamus is located deep inside the brain and does not affect the color of the CSF.

Which cerebral lobes is the largest and controls abstract thought?

Frontal The frontal lobe also controls information storage or memory and motor function. The temporal lobe contains the auditory receptive area. The parietal lobe contains the primary sensory cortex, which analyzes sensory information and relays interpretation to the thalamus and other cortical areas. The occipital lobe is responsible for visual interpretation.