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.
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Elevating the head of the bed 20 to 30 degrees is an appropriate intervention for a patient who had a craniotomy to relieve increased intracranial pressure. It helps to reduce the venous pressure and improve the cerebral perfusion.
Choice B reason: Maintaining bright lighting in the room to assess bleeding at the surgical site is not an appropriate intervention for a patient who had a craniotomy to relieve increased intracranial pressure. It can increase the sensory stimulation and aggravate the intracranial pressure. The nurse should use dim lighting and monitor the dressing and the drainage system for signs of bleeding.
Choice C reason: Stimulating the patient every half hour to assess changes in level of consciousness is not an appropriate intervention for a patient who had a craniotomy to relieve increased intracranial pressure. It can increase the cerebral metabolic demand and worsen the intracranial pressure. The nurse should assess the level of consciousness using the Glasgow Coma Scale and avoid unnecessary stimulation.
Choice D reason: Allowing the patient to change positions frequently to maintain comfort is not an appropriate intervention for a patient who had a craniotomy to relieve increased intracranial pressure. It can increase the intrathoracic pressure and affect the cerebral blood flow. The nurse should limit the patient's movement and avoid extreme flexion, extension, or rotation of the head and neck.
Correct Answer is A
Explanation
Choice A reason: This is correct. A white blood cell count of 1000/mm3 indicates severe neutropenia, which is a condition of having abnormally low levels of neutrophils, a type of white blood cell that fights infections. Neutropenic precautions are measures to protect the client from exposure to pathogens, such as wearing a mask, gloves, and gown, avoiding contact with sick people, and practicing good hygiene.
Choice B reason: This is incorrect. A red blood cell count of 5 million/mm3 is within the normal range for both males and females. It does not indicate any risk of infection or bleeding.
Choice C reason: This is incorrect. A clotting time of 10 minutes is also within the normal range, which is 8 to 15 minutes. It does not indicate any risk of infection or bleeding.
Choice D reason: This is incorrect. A thrombocyte count of 90,000 cells/mm3 is low, but not low enough to require neutropenic precautions. Thrombocytes, also known as platelets, are responsible for blood clotting. A low thrombocyte count increases the risk of bleeding, but not infection. The normal range for thrombocyte count is 150,000 to 450,000 cells/mm3.
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