You are receiving a patient who is postoperative after surgery to remove an infratentorial tumor.
Which of the following would be the correct positioning for the patient?
Reverse Trendelenburg.
Semi-Fowlers.
Flat on their side.
High Fowlers.
The Correct Answer is C
Choice A rationale
Reverse Trendelenburg positions the patient with the head higher than the feet. While this can reduce venous pressure in the lower extremities, it is not the optimal position for infratentorial tumor resection as it may not adequately facilitate venous drainage from the posterior fossa and could increase pressure on the incision site.
Choice B rationale
Semi-Fowlers position, with the head of the bed elevated to 30-45 degrees, is often used for supratentorial surgeries to promote venous drainage. However, for infratentorial tumor removal, this position can put undue pressure on the operative site due to gravity, potentially leading to complications such as swelling and CSF leakage.
Choice C rationale
Positioning the patient flat on their side is the recommended approach after infratentorial surgery. This position prevents pressure on the incision site and promotes optimal venous and cerebrospinal fluid drainage from the posterior fossa. It also helps to prevent complications such as tentorial herniation and brainstem compression.
Choice D rationale
High Fowlers position, with the head of the bed elevated to 60-90 degrees, is generally contraindicated after infratentorial surgery. This position significantly increases pressure on the posterior fossa incision due to gravity and can compromise cerebral venous outflow, potentially leading to increased intracranial pressure and other neurological deficits.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Defecation, while it can occur during severe neurological events due to autonomic dysregulation, is a non-specific sign and not a primary or direct indicator of brain herniation. Brain herniation primarily affects vital centers and cranial nerves, leading to more direct neurological compromise.
Choice B rationale
Pinpoint pupils are typically associated with pontine lesions or opioid overdose due to parasympathetic overactivity. In contrast, brain herniation, especially uncal herniation, often causes ipsilateral pupil dilation due to compression of the oculomotor nerve (cranial nerve III), leading to parasympathetic blockade.
Choice C rationale
Tachycardia, an increased heart rate, can be a non-specific response to stress, pain, or hypovolemia. In the context of brain herniation, as intracranial pressure rises and compresses the brainstem, bradycardia (slowing of the heart rate) is a more characteristic finding due to the Cushing reflex, not tachycardia.
Choice D rationale
Bilateral dilated pupils, especially when fixed and non-reactive to light, are a critical and often late sign of severe brain herniation, indicating significant brainstem compression and widespread damage, particularly to the midbrain's oculomotor nerve nuclei or their pathways. This signifies severe cerebral anoxia or irreversible brain injury.
Correct Answer is C
Explanation
Choice A rationale
Respiratory acidosis is characterized by a low pH and an elevated PaCO2. In this scenario, the pH is elevated (7.57), indicating alkalosis, and the PaCO2 (37 mmHg) is within the normal range, not elevated. Therefore, this option is inconsistent with the provided ABG results.
Choice B rationale
Metabolic acidosis is characterized by a low pH and a low bicarbonate level. The patient's pH is elevated (7.57), signifying alkalosis, and the bicarbonate (30 mEq/L) is elevated. These findings contradict the definition of metabolic acidosis.
Choice C rationale
The pH of 7.57 is significantly elevated, indicating alkalosis. The bicarbonate (HCO3) level of 30 mEq/L is elevated above the normal range (22-26 mEq/L), which directly accounts for the alkalosis. The PaCO2 of 37 mmHg is within the normal range (35-45 mmHg), indicating no respiratory compensation has occurred. This complete lack of respiratory compensation points to uncompensated metabolic alkalosis. The loss of gastric acid through the NGT contributes to this condition.
Choice D rationale
Respiratory acidosis is characterized by a low pH and an elevated PaCO2. Here, the pH is high (alkalotic) and the PaCO2 is within normal limits. Thus, this option does not match the observed blood gas values.
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