A patient is admitted with a stroke that occurred in the left hemisphere of the brain. The nurse would expect the patient to have weakness or paralysis:
On the right side of the body.
On the left side of the body.
On neither side of the body.
On both sides of the body.
The Correct Answer is A
Choice A rationale
The motor pathways in the brain, specifically the corticospinal tract, undergo decussation or crossing over at the level of the medulla oblongata. This means that the motor neurons originating in the left hemisphere of the brain control the muscle movements on the right side of the body. When a stroke occurs in the left hemisphere, the resulting damage to these neurons manifests as contralateral weakness or paralysis on the right side.
Choice B rationale
Due to the contralateral organization of the central nervous system, injury to the left side of the brain does not typically result in isolated weakness on the same side. Ipsilateral weakness would only occur if the damage was below the point of decussation in the spinal cord. In the context of a hemispheric stroke, the physical deficits appear on the opposite side of the brain lesion. Therefore, left sided weakness would indicate a right hemisphere stroke.
Choice C rationale
A stroke involving the left hemisphere typically impacts the primary motor cortex or the internal capsule, which are essential for voluntary movement. It is medically expected that such an event will produce some level of neurological deficit unless the stroke was extremely small or located in a non functional area. Weakness or paralysis is a classic symptom of middle cerebral artery strokes. Suggesting that no side is affected ignores the basic principles of clinical neurology.
Choice D rationale
Weakness on both sides of the body, or quadriparesis, usually indicates a lesion in the brainstem or a very large bilateral injury, rather than a stroke confined to the left hemisphere. The brainstem contains the motor pathways for both sides before they fully separate or decussate. A focal stroke in one hemisphere is characterized by hemiparesis or hemiplegia, affecting only one half of the body. Bilateral weakness is not a standard expectation for a unilateral hemispheric stroke.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
The frontal lobe is primarily responsible for motor function, problem-solving, spontaneity, memory, language, initiation, judgement, impulse control, and social and sexual behavior. A stroke in the frontal lobe would more likely cause hemiparesis, Broca's aphasia (difficulty speaking), or profound changes in personality. It does not contain the primary centers for auditory processing. Therefore, the patient's specific symptoms of hearing difficulty do not align with the functional specializations of the frontal cortex.
Choice B rationale
The occipital lobe is the visual processing center of the brain. It handles visual recognition, color perception, and depth perception. A stroke affecting the occipital lobe would result in visual field cuts or total blindness in specific areas of the visual field. It has no role in hearing or the regulation of emotional behaviors. Since the patient is presenting with auditory and emotional disturbances rather than sight issues, the occipital lobe is an unlikely site for the lesion.
Choice C rationale
The temporal lobe contains the primary auditory cortex and is heavily involved in processing sensory input into derived meanings for the retention of visual memory, language comprehension, and emotional association. The limbic system structures, such as the amygdala, are located within or near the temporal lobe and govern emotional behavior. Damage here frequently causes hearing deficits and emotional instability. This perfectly matches the patient's presentation of difficulty with hearing and altered emotional states following a stroke.
Choice D rationale
The parietal lobe is responsible for integrating sensory information from various parts of the body, specifically touch, pressure, and spatial awareness. It houses the somatosensory cortex. Damage to the parietal lobe typically results in hemispatial neglect, difficulty with mathematics (acalculia), or loss of sensation on one side of the body. It is not the primary site for auditory or emotional regulation. Thus, a parietal stroke would not explain the patient's hearing loss and behavioral changes.
Correct Answer is D
Explanation
Choice A rationale
This sequence incorrectly places the bicuspid valve between the right atrium and right ventricle. In the human heart, the tricuspid valve is the structure that separates the right-sided chambers, while the bicuspid or mitral valve is strictly located on the left side. Furthermore, this choice suggests the tricuspid valve is on the left, which reverses the actual anatomical and physiological flow required for effective pulmonary and systemic circulation through the four cardiac chambers.
Choice B rationale
This pathway is incorrect because it suggests that venous blood from the vena cavae enters the left atrium. Deoxygenated blood from the systemic circulation must enter the right atrium first. Additionally, it lists the tricuspid valve on the left side and the bicuspid valve on the right side. This reverses the entire cardiac anatomy, which would prevent the separation of oxygenated and deoxygenated blood, leading to a total failure of the respiratory and circulatory systems.
Choice C rationale
This description is physiologically impossible as it starts by sending systemic venous blood to the left atrium. The left side of the heart is responsible for receiving oxygenated blood from the lungs via the pulmonary veins, not deoxygenated blood from the vena cavae. It also incorrectly lists the aortic valve before the pulmonary artery and the pulmonic valve before the aorta. This sequence ignores the pressure gradients and valve functions necessary for maintaining unidirectional blood flow.
Choice D rationale
This sequence correctly follows the physiological path of blood. Deoxygenated blood enters the right atrium from the body, passes through the tricuspid valve into the right ventricle, and is pumped through the pulmonic valve to the lungs. After gas exchange, oxygenated blood returns via pulmonary veins to the left atrium, moves through the bicuspid valve to the left ventricle, and is ejected through the aortic valve into the aorta for systemic distribution. This represents the accurate anatomical circuit.
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