Performing a Neurological Assessment – GCS & Pupillary Reaction

Performing a Neurological Assessment

When performing a neurological assessment, one would be assessing the nervous system for the purpose of identifying abnormalities affecting the activities of daily living. The Glasgow Coma Scale (GCS) is an assessment tool which can objectively describe the extent of consciousness impairment incurred by acute medical and trauma patients. Similarly, pupillary reaction is assessed as an attempt to trigger a normal physiological response to the size of the pupil via the optic and oculomotor cranial nerve.

The Glasgow Coma Scale GCS Neurological Assessment

Through the use of the Glasgow Coma Scale GCS the nurse assesses the patient’s level of consciousness in a way that determines the degree of stimulation required to elicit a response.

  • the GCS is based on 3 modes of behaviour, namely Eye Opening, Verbal Response, and Motor Response
  • the GCS’s overall score should not be used alone in determining clinical findings, and must be combined with Pupillary Reaction and Vital Signs
  • the patient can score from 3 to 15, with 15 being the best score possible, and 3 being the least score possible; a patient with a score of <9 is considered to be severe, requiring an ETT
  • repeated observations indicate static, improving, or worsening of the patient’s neurological condition
  • action must be taken even if minor changes are noted
Retrieved from https://www.firstaidforfree.com/glasgow-coma-scale-gcs-first-aiders/ on 29th December 2022
neurological assessment
Retrieved from https://standardofcare.com/abnormal-posturing/ on 29th December 2022
neurological assessment
Retrieved from https://www.researchgate.net/figure/moToR-ReSpoNSeS-IN-GlASGow-ComA-SCAle_fig1_267035268 no 29th December 2022

Structured GCS Assessment

#1 – CHECK

  • identify factors which may interfere with assessment such as pre-existing factors (eg. language barrier, intellectual deficits), effects of current treatment (eg. sedation or tracheostomy), and effects of pre-incurred injuries (eg. cranial fracture or spinal cord damage)
  • if any of the above factors are determined, NT (Not Testable) should be recorded, and no total score should be listed

#2 – OBSERVE

  • observe patient for evidence of spontaneous behaviour
  • if no spontaneous behaviour is noted, observe behaviour in response to stimulation

#3 – STIMULATE

  • try to illicit a response by increasing the stimulus intensity gradually
  • for auditory stimulus, speak, and if needed, shout, using the patient’s preferred name
  • for physical stimulus to illicit eye opening, use a peripheral method by pressing on the distal part of the patient’s fingernail, increasing the intensity for up to 10 seconds
  • for physical stimulus to illicit localisation, use central methods such as the trapezius pinch or the supra-orbital notch pressure
  • AVOID sternal rub since this method can cause bruising to the patient!

#4 – RATE

  • if during your initial ‘check’ you determine that certain domains are not testable, document as NT and do not list total score
  • determine if top criteria is met based on observation – if yes, document appropriately; if no, attempt to illicit a response through stimulus as mentioned above
  • in relation to motor response, different responses between the left and right side (arms or legs) of the patient, document the best response
  • different responses between the peripheral stimulus and central stimulus, document the response stimulated centrally

NOTE:

  • EYE OPENING aim is to assess brain stem function
  • VERBAL RESPONSE aim is to assess interpretative speech and language area in the temporal lobe within the brain
  • MOTOR RESPONSE aim is to ascertain whether the cerebral cortex can interpret sensory messages and translate them to a motor response
Retrieved from https://www.physio-pedia.com/Glasgow_Coma_Scale on 29th December 2022

For more information about the Glasgow Coma Scale please visit https://www.glasgowcomascale.org/

Pupillary Reaction

In the Critical Care setting, the eyes are considered to be a ‘window to the brain’.

  • pupillary reaction to light may be brisk, sluggish, or fixed
  • sluggish, suddenly dilating, or unequal pupils may indicate compression of oculomotor cranial nerve (3rd), and/or compressed brain stem due to oedema or haematoma worsening; urgent intervention may improve outcome
  • pinpoint pupils may indicate narcotic/opioid use

NOTE: certain eye drops such as Atropine may dilate pupils.

neurological assessment
Retrieved from https://pocketdentistry.com/8-neurologic-evaluation-and-management/ on 29th December 2022

Additional Signs & Symptoms

  • Autonomic Dysfunction a.k.a. Dysautonomia – happens when the autonomic nervous system, which controls functions responsible for wellbeing and maintaining balance, does not regulate properly; signs include hypertension and hyperpyrexia
  • Persistent Vegetative State – a state of ‘eyes-open unresponsiveness’ in patients in a coma for 30 days or more; it is considered to be a chronic disorder in which a patient with severe brain damage appears to be awake but shows no evidence of awareness of their surroundings
  • Prolonged Unconsciousness a.k.a. Coma – a prolonged state of unconsciousness during which a person is unresponsive to their surrounding environment; while the patient is alive and looks like they are sleeping, they cannot be awakened by any stimulation, including pain

Did you find the above nursing information useful? Follow us on Facebook and fill in your email address below to receive new blogposts in your inbox as soon as they’re published 🙂

Neurosurgical Nursing Care

Neurosurgical nursing care involves caring of patients with neurosurgical conditions – conditions related to the brain, such as brain surgery, spinal surgery and neurological trauma. Patient-centered care is provided to the patient through a multidisciplinary team that includes consultants, HST (higher surgical trainees), BST (basic specialist trainees), HO (house officer), nurses, physiotherapists, occupational therapists, speech therapists, social workers, carers and cleaners.

Anatomy and Physiology of the Brain

neurosurgical nursing care
Retrieved from https://www.news-medical.net/health/The-Anatomy-of-the-Human-Brain.aspx on 7th November 2021

The brain occupies 80% of the cranium and is comprised of 3 major structures – the Cerebrum, the Cerebellum and the Brainstem. It received 15% of cardiac output, consumes 20% of the body’s oxygen and requires constant circulation to function. Lack of blood supply to the brain results in unconsciousness within 10 seconds and death in 4-6 minutes.

Brain Tumors

Hydrocephalus

External Ventricular Drain

Haematoma

Preoperative Neurosurgical Nursing Care

  1. Patient is orientated to the ward
  2. Past medical and surgical history, social history, as well as list of current medications and allergies are attained
  3. Neurological assessment is performed
  4. Medical notes are attained
  5. A consent form is signed by both the doctor and the patient or legal guardian or next of kin
  6. Blood tests (including cross match) are performed and chased
  7. Imaging results are attained
  8. Pre-surgery fasting is required
  9. Bowel preparation is required
  10. Patient should be washed with Chlorhexidine and dressed up in a hospital gown and TED stockings
  11. Head should be shaved
  12. Certain medications may be omitted in the morning prior to the operation, or changed to IV
  13. Patient pre-op (blue) checklist should be completed
  14. Psychological care and support should be offered to the patient pre-op and post-op, and to family members whilst waiting for the patient to come up from surgery

Postoperative Neurosurgical Nursing Care

  1. Neurological assessment should be performed at least hourly (more frequently if needed, depending on the patient’s condition and level of consciousness
  2. Blood pressure monitoring and SPO2 should be performed continuously
  3. Oxygen administration as required
  4. Blood tests should be performed
  5. Drain care may be required if the patient has a drain with suction, half suction or no suction
  6. Intake and Output charting should be maintained
  7. Urine catheter care should be maintained
  8. Monitor patient for DVT – TED stockings should only be removed for bathing and monitoring purposes
  9. Keep the patient and family updated of any procedures being carried out and reassure

Possible Complications

  • focal or generalised seizures
  • facial assymetry and/or drooling
  • aphasia (a condition which affects a person’s ability to speak, write and understand language, both verbal and written)
  • dysphagia (difficulty swallowing) – may lead to chest infection, poor nutritional intake, need for enteral feeding
  • bleeding
  • raised ICP due to post-op oedema and bleeding
  • loss of consciousness, confusion, nausea and/or vomiting
  • visual disturbance
  • gait disturbance (inability to walk normally)
  • hemiplegia (lack of limb power)
  • wound, chest, and/or CSF infection
  • DVT – LMWH (Low-Molecular-Weight-Heparin) and TED stockings
  • patient safety should be prioritised so as to avoid falls – assist patients in showering, ensure proper non-slip footwear and avoid slippery floors
  • constant supervision may be required in confused patients

Possible Post-Op Complication – Dysphagia

Assessing the Level of Consciousness in Neurosurgical Nursing Care

A state of general awareness of oneself and the environment, including the ability to orientate towards new stimuli

Hickey, 2003

Consciousness is a dynamic state resulting from integrated activities of the reticular formation and interaction with the cerebral cortex. To measure the level of consciousness of a patient, we need to measure the patient’s awareness and arousal levels, as well as if appropriate voluntary motor activities are being exhibited.

Do the patient’s eyes open spontaneously as you walk into the room? Or do they open them to command? What type of arousal level is required for this to be performed?

Is the patient aware of surroundings? Check if patient is orientated and notice communication – i.e. is speech delayed, slurred?

Is the patient drowsy and showing incomplete reaction to outside stimuli? Any signs of hallucinations, delusions or delirium?

Is the patient showing signs of stupor (mute, immobile and unresponsive but with open eyes and following external stimuli)?

Coma

A patient in a coma exhibits no voluntary movement or behaviour, and painful stimuli trigger no response. From this state, a patient can either recover to the original level of function (if cause is reversible), or is left with a degree of disabilities (in the case of irreversible damage), or ends up in a persistent vegetative state.

Persistent Vegetative State

Persistent Vegetative State is characterised by profound unresponsiveness in wakeful state as a result of brain damage at any level due to a non-functional cerebral cortex, lack of response to external stimuli, akinesia (loss/impairment of voluntary movement power), mutism (inability to speech), and inability to signal.

Locked-In Syndrome

In locked-in syndrome, the patient is fully aware and awake, has no loss of cognitive function, but is unable to move or communicate verbally due to complete paralysis of the body’s voluntary muscles, except the eyes.

Total locked-in syndrome is a version of the locked-in syndrome where the eyes are unable to move as well.

Brain Stem Death

A patient with brain stem death features irreversible unconsciousness with irreversible apnoea and irreversible loss of brain stem reflexes. Prior to being diagnosed with brain stem death, potential reversible causes such as hypothermia, metabolic causes and toxin/drug effect should be excluded.

Assessing the Level of Consciousness

The AVPU and the Glasgow Coma Scale are assessment tools which allow complete assessing of the conscious level of the patient. These can also be used within the Early Warning Score system.

Retrieved from https://www.researchgate.net/figure/Glasgow-Coma-Scale-and-Score-NICE-2003_tbl1_7857431 on 5th December 2021
Retrieved from https://twitter.com/usmleaid/status/473779270062313473 on 5th December 2021
Retrieved from https://www.ansaroo.com/question/what-can-be-the-causes-of-dilated-and-fixed-pupils on 5th December 2021
Retrieved from https://www.in.gov/bitterpill/files/1Healthcare_Provider_Toolkit_4.8_3.pdf on 5th December 2021

Rapid deterioration of neurological patients is quite possible, and an initial examination is never enough. Continuous neurological assessment AND consecutive neurocharting is a MUST for the identification of patient deterioration. This ensures early identification, management of reversible causes, and thus, reduction of permanent neurological deficit.


Did you find the above nursing information useful? Follow us on Facebook and fill in your email address below to receive new blogposts in your inbox as soon as they’re published 🙂