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The nurse is explaining early changes with Parkinson disease to the student nurse. Which statement by the nurse is correct regarding the pathophysiology of the disease?

There is total absence of dopamine at receptors in brain cells controlling motor movement, causing Parkinson symptoms to appear.

There is an excess of dopamine production and deficiency of acetylcholine production.

There is a decreased production of dopamine and excess of acetylcholine.

There is a deterioration of the myelin sheath of the basal ganglia and the person has tremors.

Answer and Explanation

The Correct Answer is C

Choice A reason: There is total absence of dopamine at receptors in brain cells controlling motor movement, causing Parkinson symptoms to appear, is not the correct statement. Parkinson disease is not caused by a complete lack of dopamine, but by a gradual loss of dopamine-producing neurons in the substantia nigra, a part of the brain that regulates movement. The symptoms of Parkinson disease, such as tremor, rigidity, and bradykinesia, appear when about 80% of the dopamine neurons are lost.

Choice B reason: There is an excess of dopamine production and deficiency of acetylcholine production, is not the correct statement. Parkinson disease is not caused by an excess of dopamine, but by a deficiency of dopamine. Dopamine is a neurotransmitter that helps to control movement, balance, and coordination. Acetylcholine is another neurotransmitter that works in opposition to dopamine. When dopamine is low, acetylcholine becomes dominant and causes abnormal muscle movements.

Choice C reason: There is a decreased production of dopamine and excess of acetylcholine, is the correct statement. Parkinson disease is caused by a decreased production of dopamine and excess of acetylcholine. This creates an imbalance in the neurotransmitters that regulate movement, leading to the characteristic symptoms of Parkinson disease, such as tremor, rigidity, and bradykinesia.

Choice D reason: There is a deterioration of the myelin sheath of the basal ganglia and the person has tremors, is not the correct statement. Parkinson disease is not caused by a deterioration of the myelin sheath, but by a degeneration of the dopamine neurons. Myelin is a fatty substance that covers the axons of the nerve cells and helps to transmit electrical impulses. The basal ganglia are a group of structures in the brain that are involved in movement, learning, and emotion. Tremors are one of the symptoms of Parkinson disease, but they are not the only or the most specific one.

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Correct Answer is B

Explanation

Choice A reason: The disorder is commonly fatal, is not a true statement. Guillain-Barre syndrome is a rare and serious condition that affects the peripheral nervous system. It causes inflammation and damage to the nerve fibers, leading to muscle weakness, numbness, and paralysis. However, most people recover from Guillain-Barre syndrome, although some may have long-term complications or disabilities. The mortality rate is about 4% to 7%.

Choice B reason: The progressive muscle weakness will begin in the lower extremities and move upward, is a true statement. Guillain-Barre syndrome usually starts with tingling and weakness in the feet and legs, and then spreads to the arms and upper body. This pattern of weakness is called ascending paralysis, and it can affect the breathing, swallowing, and facial muscles. The weakness usually reaches its peak within two to four weeks, and then gradually improves over months or years.

Choice C reason: The disorder is caused by a fungal infection, is not a true statement. Guillain-Barre syndrome is not caused by a fungal infection, but by an abnormal immune response. The exact cause of Guillain-Barre syndrome is unknown, but it is often preceded by an infection, such as a respiratory or gastrointestinal infection, or a vaccination. The immune system mistakenly attacks the nerve fibers, causing inflammation and damage.

Choice D reason: The disorder's most significant manifestations are muscle pain and stiffness, is not a true statement. Guillain-Barre syndrome's most significant manifestations are muscle weakness and paralysis, not pain and stiffness. Muscle pain and stiffness may occur in some cases, but they are not the main symptoms or the most serious ones. The weakness and paralysis can affect the vital functions, such as breathing, blood pressure, and heart rate, and require intensive care and treatment.

A. Monitoring of neurologic status B. Infusion of large volumes of isotonic intravenous fluids C. Standard precautions D. Distraction activities to reduce long periods of sleep.

Correct Answer is A

Explanation

Choice A reason: This is correct. Monitoring of neurologic status is a priority intervention for a patient with bacterial meningitis, as the infection can cause inflammation and damage to the brain and spinal cord. The nurse should assess the patient's level of consciousness, pupillary response, cranial nerve function, and signs of increased intracranial pressure.

Choice B reason: This is incorrect. Infusion of large volumes of isotonic intravenous fluids is not indicated for a patient with bacterial meningitis, as it can worsen the cerebral edema and increase the intracranial pressure. The patient should receive adequate hydration, but not excessive fluids.

Choice C reason: This is incorrect. Standard precautions are not sufficient for a patient with bacterial meningitis, as the infection can be transmitted through respiratory droplets. The patient should be placed on droplet precautions, which include wearing a mask, gloves, and gown, and limiting the contact with other patients and visitors.

Choice D reason: This is incorrect. Distraction activities to reduce long periods of sleep are not appropriate for a patient with bacterial meningitis, as the patient may need rest and sedation to reduce the agitation and pain. The nurse should provide a quiet and dark environment, and avoid unnecessary stimuli that can increase the intracranial pressure.

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The nurse is explaining early changes with Parkinson disease to the student nurse. Which statement by the nurse is correct regarding the pathophysiology of the disease?

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