# A nurse is caring for a client who sustained a severe stroke 6 hours ago. Which assessment finding requires the most immediate nursing intervention?

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## 문제

A nurse is caring for a client who sustained a severe stroke 6 hours ago. Which assessment finding requires the most immediate nursing intervention?

## 보기

1. Pupils that are unequal in size with sluggish response to light **✔ 정답**
2. Blood pressure of 160/90 mmHg with heart rate of 58 bpm
3. Glasgow Coma Scale score decrease from 12 to 10
4. Intermittent episodes of restlessness and confusion

**정답: 1**

## 해설

Unequal pupils with sluggish response indicate potential brain herniation from increased ICP, requiring immediate intervention to prevent irreversible damage. Other findings are concerning but less immediately life-threatening.

## 심화 해설

Clinical Reasoning and Prioritization

The correct answer is Pupils that are unequal in size with sluggish response to light. In the acute phase of a severe stroke, this assessment finding represents a neurological emergency requiring the most immediate intervention. The underlying pathophysiology involves the development of cerebral edema and increasing intracranial pressure (ICP) leading to uncal herniation. As the brain swells within the fixed cranial vault, the uncus of the temporal lobe is displaced, compressing the oculomotor nerve (CN III). This compression disrupts parasympathetic input to the eye, causing ipsilateral pupil dilation and a sluggish or absent reaction to light [1]. This is a late and critical sign of brainstem compression, signifying imminent, irreversible neurologic injury if not rapidly addressed.

While the other options are significant and require prompt action, they do not represent the same level of immediate threat to life as a herniation syndrome.

Analysis of Other Options

| Option | Assessment Finding | Priority Rationale |

| :--- | :--- | :--- |

| 2 | Blood pressure of 160/90 mmHg with heart rate of 58 bpm | This combination, known as Cushing's triad (hypertension, bradycardia, and irregular respirations), is a late and ominous sign of severely elevated ICP. It indicates the brain's final, desperate attempt to maintain cerebral perfusion. However, a fixed and dilated pupil is a more specific and equally late indicator of herniation that demands immediate ICP-lowering intervention. Cushing's response confirms the severity but the pupillary change pinpoints the active, compressive pathology. |

| 3 | Glasgow Coma Scale score decrease from 12 to 10 | A drop in the GCS of 2 points is a significant neurological deterioration that warrants immediate physician notification and a repeat CT scan. It indicates worsening brain function, likely from expanding edema or hemorrhage. It is a critical finding, but it is an earlier, less specific sign than a unilateral fixed pupil, which signals that the brainstem itself is now under direct mechanical compression. |

| 4 | Intermittent episodes of restlessness and confusion | In the hyperacute phase of a stroke, restlessness and confusion can be caused by hypoxemia, pain, a full bladder, or the stroke itself. This requires thorough assessment and management, but it is a non-focal and less immediately life-threatening finding compared to a sign of active brain herniation. |

Deep Dive into Pupillary Assessment

The prioritization of the pupillary finding is strongly supported by evidence linking asymmetric pupil reactivity and size to life-threatening midline shift. Quantitative pupillometry research demonstrates that changes in pupil dynamics are early, non-invasive clinical indicators of midbrain compression from supratentorial ischemic stroke or hemorrhage [1]. The association between radiographic midline shift and a poor functional outcome makes the bedside detection of this shift via pupillary changes a critical nursing skill. A sluggish, then fixed, dilated pupil is a direct consequence of this horizontal brain displacement, and its recognition is the trigger for emergent, life-saving interventions such as hyperosmolar therapy or surgical decompression [1].

The importance of this assessment is further underscored by the need for reliable, frequent monitoring. While the gold standard is manual assessment, the intermittent nature of manual checks can lead to delays in detecting this critical change. Novel technologies are being developed to monitor pupillary size and reactivity through closed eyelids, aiming to provide continuous, automated surveillance and earlier alerts for irreversible brain damage . This highlights the clinical consensus that a change in pupil reactivity is the sentinel event that must be detected and acted upon with the highest urgency to prevent permanent neurologic devastation .References (research sources)

- [1]Quantitative pupillometry and radiographic markers of intracranial midline shift: A pilot study.Research articleKim ISY, Balogun OO, Prescott BR, Saglam H, Olson DM, Speir K, Stutzman SE, Schneider N, Aguilera V, Lussier BL, Smirnakis SM, Dupuis J, Mian A, Greer DM, Ong CJ. (2022) · DOI: 10.3389/fneur.2022.1046548

## 임상 시나리오

Acute Stroke: Recognizing HerniationPrioritizing a Blown Pupil Over Cushing's Triad
A new finding of unequal pupils with a sluggish response to light in an acute stroke patient is a late sign of uncal herniation and brainstem compression. This requires the most immediate intervention, often preceding a call to the provider while preparing for hyperosmolar therapy or emergency surgery.

Cushing's triad (hypertension, bradycardia, irregular respirations) is also a late sign of elevated ICP but represents a compensatory mechanism. A fixed, dilated pupil indicates actual mechanical compression of CN III and is a more specific and equally critical sign of impending irreversible injury.

CautionDo not wait for Cushing's triad to fully develop. A single, newly blown pupil in the setting of acute stroke is a neurosurgical emergency. Immediately notify the provider and prepare for interventions to rapidly lower ICP, such as administering mannitol or hypertonic saline.

## 핵심 개념

- **Uncal Herniation** — Displacement of the uncus of the temporal lobe over the tentorium cerebelli, compressing the oculomotor nerve (CN III) and brainstem, often due to increased ICP.
- **Oculomotor Nerve (CN III)** — Cranial nerve responsible for pupillary constriction and most eye movements; compression causes ipsilateral pupil dilation and sluggish or absent light response.
- **Cushing's Triad** — A late, ominous sign of increased ICP characterized by hypertension, bradycardia, and irregular respirations, indicating the brain's final compensatory effort to maintain perfusion.

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