A patient has a lesion on their left cerebral lobe.
Which of the following would you expect to see during assessment?
Left leg weakness.
Right arm weakness.
Left arm weakness.
Right pupil is fully dilated.
The Correct Answer is B
Choice A rationale
A lesion on the left cerebral lobe, specifically the motor cortex, would affect the contralateral side of the body due to the decussation of corticospinal tracts in the brainstem. Therefore, a left cerebral lesion would typically result in motor deficits, such as weakness, on the right side of the body, not the left leg.
Choice B rationale
The motor pathways from the cerebral cortex descend and cross over (decussate) in the brainstem. Consequently, a lesion in the left cerebral hemisphere will manifest as motor deficits, such as weakness or paralysis, on the contralateral or right side of the body. This includes the right arm, consistent with the expected neurological deficit.
Choice C rationale
As explained by the principle of decussation, a lesion in the left cerebral lobe would impact the motor function of the right side of the body. Therefore, left arm weakness would typically be associated with a lesion in the right cerebral hemisphere, not the left.
Choice D rationale
Pupil dilation is primarily controlled by the oculomotor nerve (cranial nerve III) and sympathetic nervous system pathways. While certain brain lesions can affect pupillary responses, a lesion on the cerebral lobe itself is less likely to directly cause unilateral, fully dilated pupils as a primary motor symptom. Pupillary changes often indicate brainstem involvement or increased intracranial pressure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","E"]
Explanation
Choice A rationale
A positive sputum culture definitively identifies the pathogenic microorganisms responsible for the infection within the lungs. This microbiological evidence is crucial for confirming the presence of pneumonia and guiding appropriate antibiotic therapy, distinguishing VAP from other pulmonary issues.
Choice B rationale
A new fever indicates a systemic inflammatory response, often triggered by an infection. In the context of a ventilated patient, a new onset of fever, particularly above 38°C (100.4°F), strongly suggests the presence of a new infection, such as ventilator-associated pneumonia.
Choice C rationale
An SpO2 of 98% indicates excellent oxygen saturation. While desirable, it does not rule out VAP, as patients can initially maintain good oxygenation despite developing an infection, especially if the pneumonia is localized or mild in its early stages.
Choice D rationale
A respiratory rate of 14 breaths per minute is within the normal range. A normal respiratory rate does not indicate the presence or absence of VAP, as patients with early or localized pneumonia might not exhibit significant changes in their respiratory patterns initially.
Choice E rationale
New infiltrates on a Chest X-Ray indicate areas of consolidation or fluid accumulation within the lung tissue. These radiological findings are highly suggestive of pneumonia, as the inflammatory process associated with infection leads to alveolar filling and opacities visible on imaging.
Correct Answer is ["C","D"]
Explanation
Choice A rationale
Patient self-extubation would typically trigger a low-pressure alarm, not a high-pressure alarm, because the ventilator circuit would no longer be connected to the patient's airway, resulting in a sudden drop in airway pressure and a loss of positive pressure ventilation.
Choice B rationale
Disconnection of the tubes, similar to self-extubation, would lead to a low-pressure alarm due to the loss of a closed circuit. The ventilator would detect a rapid decrease in pressure within the system as air escapes, indicating a leak or complete disconnection.
Choice C rationale
Tube displacement, particularly if the endotracheal tube is pushed deeper into the bronchus or becomes kinked, increases airway resistance. This heightened resistance requires the ventilator to exert more pressure to deliver the set tidal volume, thus triggering a high-pressure alarm.
Choice D rationale
The patient biting the endotracheal (ET) tube creates an occlusion within the airway, significantly increasing airway resistance. This increased resistance makes it harder for the ventilator to deliver breaths, leading to a rapid rise in peak inspiratory pressure and activating the high-pressure alarm.
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