A nurse is assessing a patient with a complete C5 spinal cord injury who was admitted 2 hours ago following a motor vehicle accident. Which assessment finding would be the most critical indicator requiring immediate intervention?
1Blood pressure 80/45 mmHg with heart rate 52 bpm✓ 정답
2Absence of sensation below the nipple line
3Inability to move lower extremities
4Urinary retention with bladder distension
해설
Blood pressure 80/45 mmHg with heart rate 52 bpm indicates neurogenic shock, a life-threatening complication of acute spinal cord injury above T6 requiring immediate intervention. Other findings are expected deficits from the injury.
Core Nursing ExplanationKey Concept Analysis: This question tests the ability to recognize a life-threatening complication of an acute, high-level spinal cord injury (SCI). The patient has a complete C5 spinal cord injury, meaning damage at the 5th cervical vertebra. The most critical complication in the acute phase (first hours to days) is neurogenic shock. This occurs due to disruption of the sympathetic nervous system pathways in the spinal cord, leading to a loss of vascular tone (vasodilation) and unopposed parasympathetic (vagal) activity.
Answer Rationale: Key Point! The vital signs in option 1 – Blood pressure 80/45 mmHg (hypotension) with heart rate 52 bpm (bradycardia) – are the classic triad of neurogenic shock: hypotension, bradycardia, and hypothermia (due to loss of thermoregulation). This is a medical emergency because the profound vasodilation and bradycardia can lead to inadequate perfusion to vital organs, including the spinal cord itself, potentially worsening the injury. Immediate interventions include fluid resuscitation, vasopressor medications, and atropine for symptomatic bradycardia.
Distractor Analysis:
Watch out for confusion! Option 2, "Absence of sensation below the nipple line," is an expected finding for a C5 injury. The nipple line (T4 dermatome) is below the level of injury (C5), so this confirms the neurological deficit but is not an acute emergency requiring immediate intervention.
Watch out for confusion! Option 3, "Inability to move lower extremities," is also an expected motor deficit (paraplegia) from a complete spinal cord injury and is part of the initial diagnosis, not an acute complication.
Option 4, "Urinary retention with bladder distension," is a common and expected consequence of spinal shock (the loss of reflexes below the level of injury, including the bladder reflex). While it requires nursing management (e.g., urinary catheterization), it is not the most critical life-threatening finding compared to cardiovascular collapse from neurogenic shock.
Related Concepts: It is crucial to distinguish Neurogenic shock from Spinal shock. Spinal shock is the temporary loss of all reflex activity, motor, and sensory function below the level of injury. Neurogenic shock is the hemodynamic instability (hypotension, bradycardia) that can occur concurrently, especially with injuries above T6. Another critical complication to monitor for is Autonomic dysreflexia, which typically occurs in chronic SCI (months to years post-injury) and presents with severe hypertension, not hypotension.
Concept Summary
Concept
Definition & Key Features
Neurogenic Shock
Hemodynamic instability due to loss of sympathetic tone after SCI above T6. Presents with hypotension, bradycardia, and hypothermia. A medical emergency.
Spinal Shock
Temporary loss of all neurological function (flaccid paralysis, areflexia, loss of sensation) below the level of injury. Can last days to weeks.
Autonomic Dysreflexia
A life-threatening hypertensive crisis in chronic SCI (usually T6 or above) triggered by a noxious stimulus below the injury level (e.g., full bladder).
Complete C5 Injury
Results in tetraplegia (quadriplegia). Patient will have intact diaphragm (C3-C5) but impaired respiratory function, no motor/sensory function below the shoulders.
Side-by-Side Comparison!
Feature
Neurogenic Shock (Acute)
Autonomic Dysreflexia (Chronic)
Onset
Immediate, within hours of injury.
Months to years after injury (once spinal shock resolves).
Blood Pressure
Severe Hypotension (e.g., 80/45)
Severe Hypertension (e.g., 200/110)
Heart Rate
Bradycardia
Bradycardia (paradoxical)
Cause
Loss of sympathetic outflow.
Unchecked sympathetic response to a stimulus below injury.
Anatomy: The sympathetic nervous system fibers exit the spinal cord from T1 to L2. An injury above T6 disrupts most of this outflow, causing widespread vasodilation.
Physiology: Unopposed vagal (parasympathetic) tone leads to bradycardia. Vasodilation causes blood pooling in the periphery, leading to hypotension and reduced venous return (preload).
Pharmacology: First-line treatment includes IV crystalloids (e.g., Normal Saline) for volume. Vasopressors like Norepinephrine or Phenylephrine are used to increase vascular tone. Atropine is given for symptomatic bradycardia.
Memory Tips
Neurogenic Shock Triad: Remember the 3 H's: Hypotension, Hypothermia, Heart rate down (Bradycardia).
Shock Differentiation: "Neurogenic is the only shock with Bradycardia and Warm skin." Other shocks (hypovolemic, septic, cardiogenic) usually cause tachycardia and cool, clammy skin.
Injury Level C5: Think "C5, stay alive" – diaphragm function (C3-C5) may be impaired but is often intact; however, intercostal muscles (T1-T12) are paralyzed, leading to shallow breathing and poor cough.
High-Frequency NCLEX Topics
Neurogenic shock is a high-yield NCLEX topic. You must be able to:
Identify the vital sign pattern (Hypotension + Bradycardia).
Know it is associated with acute spinal cord injury above T6.
Prioritize it over other neurological deficits.
Differentiate it from autonomic dysreflexia (the opposite blood pressure problem).
Watch Out for Question Variations!
Symptom Identification → Priority Intervention: "The nurse notes BP 78/40, HR 48 in a patient with a new T4 SCI. What is the nurse's priority action?" (Answer: Administer prescribed IV fluids and vasopressors, prepare to give atropine).
Expected vs. Unexpected: "Which finding in a patient with a C6 spinal cord injury requires immediate reporting to the provider?" (The hypotensive/bradycardic option is correct; options about paralysis or numbness are expected).
Chronic Phase Complication: The same patient presentation but set "6 months post-injury" would shift the priority to recognizing autonomic dysreflexia (severe hypertension) as the critical finding.
Nursing Clinical Practice GuideClinical Scenario: You are the nurse in the Emergency Department. A 22-year-old male is brought in via ambulance after a diving accident. He is immobilized on a backboard with a cervical collar. Initial assessment reveals he cannot move his arms or legs. He is alert and oriented but anxious. His initial vital signs were stable, but on your 2-hour reassessment, you find: BP 82/48, HR 50, SpO2 96% on room air, Temp 36.0°C (96.8°F). His skin is warm and dry.
Nursing Intervention Strategy:
Immediate Assessment & Action (ABCs):
Airway/Breathing: Maintain cervical spine immobilization. Assess respiratory effort (C5 injury can impair diaphragmatic function). Listen for breath sounds. Anticipate need for intubation if respiratory fatigue develops.
Circulation: Recognize neurogenic shock. This is your priority. Start two large-bore IV lines. Administer isotonic IV fluids (e.g., Normal Saline) bolus as ordered to support blood pressure.
Monitoring: Connect to continuous cardiac monitoring (watch for bradycardia). Insert an indwelling urinary catheter (Foley) to monitor urine output (goal >30 mL/hr) and manage bladder distension.
Collaboration & Medication Administration:
Notify the physician/provider immediately of the vital signs.
Prepare to administer vasopressor medications (e.g., Norepinephrine drip) via an infusion pump to maintain MAP (Mean Arterial Pressure) >85 mmHg (to ensure spinal cord perfusion).
Have Atropine at the bedside for symptomatic bradycardia (e.g., HR <40 with hypotension).
Ongoing Care & Prevention:
Thermoregulation: Use warming blankets (avoid electric blankets due to burn risk from lack of sensation). Monitor temperature frequently.
Skin Integrity: Perform a thorough skin assessment. Reposition every 2 hours with log-rolling technique to prevent pressure ulcers.
Neurological Checks: Perform frequent neuro checks (motor, sensory, reflexes) to establish a baseline and monitor for changes.
Patient Safety and Precautions:
Spinal Immobilization is Paramount: Do not remove the cervical collar or log-roll the patient without a team and proper orders. Further movement can cause permanent damage.
Medication Caution: When giving IV fluids, monitor closely for signs of fluid overload (crackles in lungs) as the patient's cardiovascular system is unstable. Titrate vasopressors carefully per protocol.
Bradycardia Alert: Suctioning can stimulate the vagus nerve and cause severe bradycardia. Pre-oxygenate the patient and suction for no more than 10-15 seconds if needed.
Nursing Procedure & Medication FlowManaging a Vasopressor Infusion (e.g., Norepinephrine):
Always administer via an IV infusion pump.
Use a central venous line if possible, as vasopressors are vesicants and can cause tissue necrosis if they infiltrate.
Label the IV line clearly: "VASOPRESSOR – Norepinephrine".
Monitor blood pressure every 5-15 minutes during titration.
Have a second IV line for maintenance fluids and other medications.
A Word from Your Senior Nurse
"In trauma and neuro nursing, your assessment skills are everything. That first set of vitals post-admission is a baseline, but the trends tell the story. A dropping blood pressure with a slowing heart rate in a spinal cord injury patient isn't just 'a little low' – it's a red flag waving frantically for neurogenic shock. You are the one at the bedside who will catch this change. Remember, in the acute phase, think Circulation and Breathing (after securing the Airway and spine). Your quick recognition and action can stabilize the patient's hemodynamics and protect their spinal cord from secondary ischemic injury. This is where textbook knowledge saves lives."
Neurogenic Shock — A distributive shock caused by loss of sympathetic tone, typically from spinal cord injury above T6, characterized by hypotension, bradycardia, and warm, dry skin (vasodilation).
Spinal Shock — A temporary state of flaccid paralysis, areflexia, and loss of sensation below the level of spinal cord injury, representing a disruption of communication between the brain and spinal cord.
Autonomic Dysreflexia — A life-threatening hypertensive emergency in patients with spinal cord injury above T6, triggered by a noxious stimulus below the injury level, requiring immediate identification and removal of the trigger.
Tetraplegia — Paralysis of all four limbs and the trunk, resulting from injury to the cervical spinal cord (C1-C8).
Mean Arterial Pressure — The average pressure in a patient's arteries during one cardiac cycle. In acute spinal cord injury, a MAP >85 mmHg is often targeted to ensure adequate perfusion of the spinal cord.