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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 A

Explanation

Choice A reason: ALS is a neurodegenerative disease that affects the motor neurons, which control the voluntary muscles. It does not affect the cognitive or mental functions, such as memory, reasoning, or emotions. Therefore, the person with ALS will be aware of their condition and their surroundings, even when they lose their ability to move, speak, or breathe.

Choice B reason: ALS affects the muscles of the mouth, throat, and chest, which are involved in swallowing. As the disease progresses, the person with ALS will have difficulty swallowing food, liquids, and saliva. This can lead to malnutrition, dehydration, choking, and aspiration pneumonia.

Choice C reason: ALS does not directly cause seizures, which are abnormal electrical activity in the brain. However, some medications used to treat the symptoms of ALS, such as muscle relaxants, may increase the risk of seizures. Therefore, the person with ALS should be monitored for any signs of seizures, such as loss of consciousness, convulsions, or confusion.

Choice D reason: ALS affects the muscles of the diaphragm and the intercostal muscles, which are involved in breathing. As the disease progresses, the person with ALS will have difficulty breathing, especially at night or when lying down. This can lead to respiratory failure, which is the most common cause of death in ALS. Therefore, the person with ALS may need mechanical ventilation or noninvasive positive pressure ventilation to support their breathing.

A. decreasing intracranial pressure with decerebrate posturing. B. increasing intracranial pressure with decorticate posturing. C. decreasing intracranial pressure with decorticate posturing. D. increasing intracranial pressure with decerebrate posturing.

Correct Answer is B

Explanation

Choice A reason: Decreasing intracranial pressure with decerebrate posturing is not the correct answer. Decerebrate posturing is a sign of severe brain damage that involves the extension and outward rotation of the arms and legs, and the arching of the back. It is not associated with decreasing intracranial pressure, but rather with increased pressure or brainstem compression.

Choice B reason: Increasing intracranial pressure with decorticate posturing is the correct answer. Decorticate posturing is a sign of severe brain damage that involves the flexion of the arms at the elbows and the extension of the legs. It is associated with increased intracranial pressure or lesions in the cerebral hemispheres.

Choice C reason: Decreasing intracranial pressure with decorticate posturing is not the correct answer. Decorticate posturing is a sign of severe brain damage that involves the flexion of the arms at the elbows and the extension of the legs. It is not associated with decreasing intracranial pressure, but rather with increased pressure or lesions in the cerebral hemispheres.

Choice D reason: Increasing intracranial pressure with decerebrate posturing is not the correct answer. Decerebrate posturing is a sign of severe brain damage that involves the extension and outward rotation of the arms and legs, and the arching of the back. It is associated with increased intracranial pressure or brainstem compression, but it is not the posture described in the question.

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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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