The nurse plans care for a client with a traumatic brain injury who exhibits signs of post-concussion syndrome, including headaches, irritability, and sleep disturbances.
Which strategy should the nurse include in the client's care plan?

Evaluating pulmonary embolism in patients with renal impairment requires knowledge of contrast-induced nephropathy risks. One must apply understanding of different imaging modalities to select a test that provides diagnostic clarity without using nephrotoxic agents that would worsen kidney failure.

Choice A rationale

Pulmonary angiography is an invasive procedure requiring a large bolus of iodinated contrast. In a client with chronic kidney disease and recent nephropathy, this would likely cause further irreversible damage to the remaining renal function.

Choice B rationale

D-dimer is a screening tool with high sensitivity but low specificity. While it does not require contrast, it cannot definitively diagnose a PE. It is used to rule out PE in low-risk patients rather than confirm.

Choice C rationale

A ventilation-perfusion scan uses radioactive isotopes rather than iodinated contrast. It is the preferred diagnostic test for patients with renal failure because it avoids the risk of contrast-induced nephropathy while effectively assessing for V/Q mismatch.

Choice D rationale

A chest X-ray is useful for ruling out other causes of respiratory distress like pneumonia or pneumothorax, but it is not sensitive or specific enough to diagnose a pulmonary embolism. Most PE patients have normal X-rays..

Management of hypertensive crisis involves using calcium channel blockers to achieve rapid vascular relaxation. Knowledge of pharmacodynamics is necessary to explain how nicardipine reduces systemic vascular resistance to mitigate the risk of cerebrovascular accidents and end organ damage in emergencies.

Choice A rationale

Nicardipine is a dihydropyridine calcium channel blocker that primarily causes vasodilation. It does not act as a positive chronotrope. Increasing heart rate in a hypertensive crisis could dangerously increase myocardial oxygen demand and exacerbate the clinical situation.

Choice B rationale

The medication does not possess analgesic properties or stimulate endorphin release. While the headache may improve as intracranial pressure decreases from lowered blood pressure, the primary pharmacological mechanism is vascular smooth muscle relaxation rather than pain modulation.

Choice C rationale

Nicardipine inhibits calcium ion influx into vascular smooth muscle, leading to rapid peripheral vasodilation. In a hypertensive emergency (BP > 180/120 mm Hg), quick reduction is critical to prevent intracranial hemorrhage, encephalopathy, or ischemic stroke.

Choice D rationale

Nicardipine does not function as a diuretic. While lowering blood pressure reduces renal strain, it does not promote fluid loss through the kidneys. Diuretics like furosemide are separate agents used for volume related hypertension or edema.