A nurse is assessing a 65-year-old patient admitted with suspected viral encephalitis. Which assessment finding would be most indicative of increased intracranial pressure (ICP) in this patient?
The nurse is conducting a neurological assessment on a patient with viral encephalitis.
1Temperature of 102.8°F (39.3°C) with chills
2Widening pulse pressure with bradycardia✓ 정답
3Photophobia and neck stiffness
4Altered level of consciousness and confusion
해설
Widening pulse pressure with bradycardia (Cushing's triad) is a late sign of increased ICP, indicating brainstem compression and requiring immediate intervention. Other findings like fever, photophobia, or altered consciousness are common in encephalitis but less specific for critical ICP elevation.
Core Nursing ExplanationKey Concept Analysis: This question tests the ability to identify a classic, life-threatening sign of Increased Intracranial Pressure (ICP) in a patient with Viral encephalitis. Encephalitis involves inflammation of the brain parenchyma, which can lead to cerebral edema and a dangerous rise in ICP. While many neurological symptoms are present, the nurse must recognize the specific signs of impending brain herniation.
Answer Rationale: Key Point! The correct answer is Widening pulse pressure with bradycardia. This is a component of Cushing's triad, a late and ominous sign of severely elevated ICP. The triad consists of: 1) Hypertension (with a widening pulse pressure), 2) Bradycardia, and 3) Irregular respirations (Cheyne-Stokes or ataxic breathing). This physiological response occurs due to brainstem ischemia and compression, triggering a last-ditch effort by the body to maintain cerebral perfusion pressure (CPP). Recognizing this sign is critical as it indicates a neurosurgical emergency.
Distractor Analysis: Watch out for confusion!Temperature of 102.8°F (39.3°C) with chills: While common in infectious processes like encephalitis, fever is a non-specific sign. It indicates the body's inflammatory response but does not directly point to elevated ICP. In fact, fever can worsen cerebral edema and should be managed, but it is not a cardinal sign of ICP. Watch out for confusion!Photophobia and neck stiffness: These are classic signs of Meningeal irritation, often seen in meningitis and sometimes in encephalitis. They suggest inflammation of the meninges but are not specific indicators of increased pressure within the cranial vault. Watch out for confusion!Altered level of consciousness and confusion: This is a very common and early sign of both encephalitis and increasing ICP. A change in LOC is often the first clue. However, the question asks for the finding most indicative of increased ICP. While important, altered LOC is less specific than Cushing's triad, which is pathognomonic for life-threatening ICP elevation.
Related Concepts: Early signs of increased ICP include headache, vomiting (often projectile), and decreasing level of consciousness (LOC). Late signs include pupillary changes (unequal, dilated, or non-reactive), posturing (decorticate or decerebrate), and finally, Cushing's triad. The priority nursing intervention for suspected increased ICP is to maintain a patent airway and ensure adequate oxygenation to prevent secondary brain injury from hypoxia.
Nursing Clinical Practice GuideClinical Scenario: You are the nurse for Mr. Johnson, a 65-year-old admitted with herpes simplex virus encephalitis. He has been increasingly lethargic over your shift. During your routine neuro checks, you note his blood pressure is 180/92 mm Hg (previously 140/80), his heart rate is 52 bpm (previously 78), and his respirations have become irregular.
Nursing Intervention Strategy:
1Immediate ActionStay with the patient. Call for help and notify the physician/provider immediately. This is a Key Point! neurological emergency. Do not wait to complete your full assessment.
2AssessmentQuickly reassess the full Neurological assessment: Glasgow Coma Scale (GCS), pupillary size and reaction, motor response, and vital signs. Document everything precisely.
3PositioningEnsure the head of bed (HOB) is elevated to 30 degrees to promote venous drainage from the brain, unless contraindicated by spinal precautions or shock.
4OxygenationAdminister supplemental oxygen as ordered to maintain SpO2 >95%. Prepare for possible intubation to protect the airway and control ventilation (PaCO2 is a potent regulator of cerebral blood flow).
5Minimize StimuliCluster nursing care, keep the environment quiet and dim, and avoid activities that increase ICP (e.g., Valsalva maneuver, excessive suctioning, hip flexion).
6Medication PreparationAnticipate and prepare for administration of osmotic diuretics like Mannitol or hypertonic saline as ordered to reduce cerebral edema.
Patient Safety and Precautions: Never hyperextend or flex the patient's neck, as this can impede jugular venous return and further increase ICP. Avoid noxious stimuli like painful procedures. Monitor for seizure activity. Strict intake and output monitoring is crucial when diuretics are administered to prevent electrolyte imbalances and renal injury.
1ActionOsmotic diuretic that draws fluid from the brain tissue into the vasculature, reducing cerebral edema and ICP.
2AdministrationGiven via IV infusion through a filter, typically as a 20% solution. Infuse exactly as ordered (e.g., 0.25-1 g/kg over 20-30 minutes).
3MonitoringMonitor serum osmolality (goal often <320 mOsm/kg) and electrolytes, especially sodium and potassium. Watch for signs of fluid overload (crackles, edema) initially, followed by dehydration. Ensure the patient has a Foley catheter in place, as rapid diuresis will occur.
4Contraindications/CautionsUse with extreme caution in patients with anuria, severe pulmonary edema, or congestive heart failure (CHF).
A Word from Your Senior Nurse
"In neuro nursing, you are the guardian of your patient's brain function. Subtle changes are everything. A drop of 2 points on the GCS, a slight pupillary sluggishness, or a change in vital signs can be the only warning before a catastrophic herniation. When you see Cushing's triad, your brain should scream 'RED ALERT.' This isn't just a test answer; it's a real-life signal to act fast and decisively. On the NCLEX, they love to test your ability to prioritize, and recognizing life-threatening complications like increased ICP is always top priority."
Cushing's Triad — A classic late sign of increased intracranial pressure (ICP) consisting of hypertension (with a widening pulse pressure), bradycardia, and irregular respirations. It indicates brainstem compression and is a medical emergency.
Cerebral Perfusion Pressure — The net pressure gradient driving blood flow to the brain. Calculated as Mean Arterial Pressure (MAP) minus Intracranial Pressure (ICP). A CPP < 60 mm Hg is critical and can lead to cerebral ischemia.
Glasgow Coma Scale — A standardized neurological assessment tool that evaluates a patient's level of consciousness based on eye opening, verbal response, and motor response. Scores range from 3 (deep coma) to 15 (fully alert).
Meningeal Irritation — Inflammation of the meninges (the membranes covering the brain and spinal cord), characterized by symptoms such as nuchal rigidity (neck stiffness), photophobia (light sensitivity), and Kernig's or Brudzinski's signs.
Osmotic Diuretic — A hyperosmolar agent used to reduce cerebral edema and lower intracranial pressure. It works by creating an osmotic gradient that draws fluid from the brain tissue into the bloodstream for excretion by the kidneys.
Concept Summary
Concept
Key Points
Increased ICP
Pressure inside the skull exceeds normal (5-15 mm Hg). Caused by mass effect, edema, or increased CSF.