The nurse provides care for a patient with an 8-year history of Parkinson's disease. The patient has difficulty getting out of chairs, makes tremulous movements, and mumbles words. What is the best explanation for these clinical manifestations?

Choice A reason: Non-Hodgkin lymphoma is not the correct answer because it is a type of cancer that affects the lymphocytes, which are a type of white blood cell that are part of the immune system. Non-Hodgkin lymphoma does not have Reed-Sternberg cells, which are abnormal, large, and multinucleated cells that are characteristic of Hodgkin lymphoma.

Choice B reason: Multiple myeloma is not the correct answer because it is a type of cancer that affects the plasma cells, which are a type of lymphocyte that produce antibodies. Multiple myeloma does not have Reed-Sternberg cells, but it can have abnormal plasma cells that are called myeloma cells.

Choice C reason: Hodgkin lymphoma is the correct answer because it is a type of cancer that affects the lymphatic system, which is a network of organs, tissues, and vessels that help fight infections and diseases. Hodgkin lymphoma has Reed-Sternberg cells, which are the hallmark of this disease. Reed-Sternberg cells are thought to be derived from B lymphocytes, which are a type of lymphocyte that produce antibodies.

Choice D reason: Acute lymphocytic leukemia is not the correct answer because it is a type of cancer that affects the immature lymphocytes, which are called lymphoblasts. Acute lymphocytic leukemia does not have Reed-Sternberg cells, but it can have abnormal lymphoblasts that are called leukemic cells.

Choice A reason: Inflammation of white matter in the brain and spinal cord is not the best explanation because it is a condition that affects the transmission of nerve impulses, not the perception of sensory stimuli. White matter is the part of the nervous system that consists of myelinated axons, which are the extensions of nerve cells that carry electrical signals from one cell to another. Inflammation of white matter can be caused by various factors, such as infections, autoimmune diseases, or trauma, and can result in symptoms such as weakness, numbness, or paralysis.

Choice B reason: Increased levels of gamma-aminobutyric acid (GABA) in the brain stem is not the best explanation because it is a condition that affects the regulation of muscle tone, not the perception of sensory stimuli. GABA is a neurotransmitter, which is a chemical messenger that transmits signals between nerve cells. GABA is an inhibitory neurotransmitter, which means that it reduces the activity of the nerve cells that it binds to. GABA is mainly found in the brain stem, which is the part of the brain that connects the spinal cord to the cerebrum and cerebellum, and controls vital functions such as breathing, heart rate, and blood pressure. Increased levels of GABA in the brain stem can cause symptoms such as spasticity, rigidity, or tremors.

Choice C reason: Decreased levels of endorphins in the pons and medulla is not the best explanation because it is a condition that affects the modulation of pain, not the perception of sensory stimuli. Endorphins are neurotransmitters that act as natural painkillers, by binding to the opioid receptors in the brain and spinal cord, and blocking the transmission of pain signals. Endorphins are produced by the pituitary gland and the hypothalamus, which are parts of the brain that regulate the hormonal and nervous systems. The pons and the medulla are parts of the brain stem that are involved in the control of voluntary and involuntary movements, such as chewing, swallowing, coughing, sneezing, and blinking. Decreased levels of endorphins in the pons and the medulla can cause symptoms such as increased sensitivity to pain, anxiety, or depression.

Choice D reason: Hypoxia and necrosis of the parietal lobe neurons is the best explanation because it is a condition that affects the processing of sensory stimuli, such as touch, pain, temperature, and position. The parietal lobe is the part of the cerebrum that is responsible for integrating and interpreting sensory information from different parts of the body. The parietal lobe is divided into two hemispheres, each corresponding to the opposite side of the body. A left-sided intracerebral hemorrhage is a condition where a blood vessel in the left parietal lobe ruptures, causing bleeding and swelling in the brain tissue. This can damage the neurons, which are the nerve cells that communicate with each other and form the basis of the nervous system. Hypoxia and necrosis of the parietal lobe neurons can cause symptoms such as loss of sensation, neglect, or agnosia on the right side of the body.