A client is admitted with a closed head injury sustained in a motor vehicle accident.
The nurse notes that the client's intracranial pressure (ICP) shows an upward trend. Which action should the nurse prioritize?

This scenario requires understanding acid-base balance and renal pathophysiology. Acute kidney injury impairs the kidneys ability to excrete hydrogen ions and regenerate bicarbonate. Identifying metabolic acidosis with partial respiratory compensation is necessary based on the interpretation of arterial blood gas values.

Choice A rationale

Metabolic acidosis occurs in kidney injury due to decreased acid excretion. The pH is low at 7.26 (7.35 to 7.45) and bicarbonate is low at 14 (22 to 28), while the PaCO2 of 30 shows compensatory hyperventilation.

Choice B rationale

A pH of 7.26 indicates acidosis, but the normal bicarbonate level of 24 and elevated PaCO2 of 46 indicate respiratory acidosis. This occurs with hypoventilation and carbon dioxide retention rather than the metabolic issues seen in kidney failure.

Choice C rationale

The pH of 7.49 indicates alkalosis. A high bicarbonate of 30 with a normal PaCO2 of 40 represents uncompensated metabolic alkalosis. This is typical of excessive acid loss or base gain, which is opposite of kidney failure.

Choice D rationale

The pH of 7.49 and low PaCO2 of 30 suggest respiratory alkalosis. Bicarbonate is normal at 24. This state results from hyperventilation and excessive carbon dioxide loss, which does not characterize the pathophysiology of acute kidney injury.

Rationale for correct condition hemorrhagic stroke is strongly indicated by the "worst headache of my life," sudden aphasia, and left-sided weakness. an inr of 4.9 is critically high, significantly increasing bleeding risk. negative kernig and brudzinski signs help rule out meningitis despite the fever history. the presence of photophobia and vision loss further supports an intracranial event.

Rationale for correct actions a stat ct brain is the gold standard to differentiate between ischemic and hemorrhagic events and identify intracranial bleeding. a lumbar puncture may be indicated if the ct is negative but clinical suspicion of subarachnoid hemorrhage remains high. these actions are time-sensitive to prevent secondary brain injury from increased intracranial pressure. normal inr for a client not on anticoagulants is 0.8-1.1. the nurse must prioritize diagnostic imaging to guide surgical or medical intervention. these steps address the acute neurological deficit and high-intensity headache.

Rationale for correct parameters blood pressure must be monitored strictly as hypertension can exacerbate intracranial bleeding and worsen stroke outcomes. the client's blood pressure rose from 119/85 to 159/83 mm hg, indicating a need for tight control. monitoring pt/inr is vital due to the supratherapeutic level of 4.9, which necessitates reversal agents like vitamin k or fresh frozen plasma. normal prothrombin time is typically 11-13.5 seconds. managing these parameters prevents further hematoma expansion. frequent neurological checks are also implicit in monitoring these physiological markers.

Rationale for incorrect conditions migraine headache does not typically present with sudden aphasia, hemiparesis, or an inr of 4.9. trigeminal neuralgia is characterized by stabbing facial pain, which the client explicitly denied. meningitis is unlikely given the negative kernig and brudzinski signs and the sudden, focal neurological deficits. while the client had a fever, the clinical picture is dominated by vascular and neurological collapse.

Rationale for incorrect actions administering sumatriptan is contraindicated in suspected stroke as it causes vasoconstriction and is intended for migraines. carbamazepine is the specific treatment for trigeminal neuralgia, which does not match this client's presentation. providing ibuprofen or other anticoagulants would be dangerous given the already elevated inr of 4.9.

Rationale for incorrect parameters a headache diary for food triggers is a long-term management tool for migraine headache, not an acute stroke. temperature monitoring is less critical than hemodynamics in the immediate management of a suspected hemorrhage. while the wbc is slightly elevated, it is expected with a uti and is less urgent than the neurological crisis.