Question 9

College comments

Syllabus topic/section: 2.1.13 Trauma Intensive Care. Traumatic Brain Injury L1

Discussion: 

To achieve high marks, candidates should move beyond generic TBI management and demonstrate a detailed understanding of pituitary dysfunction in the context of TBI. High-scoring responses acknowledged the diagnostic challenges of detecting pituitary injury in acute trauma settings.
Strong answers differentiated between acute and delayed manifestations of pituitary dysfunction, emphasizing the importance of early recognition and management of life-threatening hormonal deficiencies—particularly ADH (diabetes insipidus, SIADH) and cortisol (secondary adrenal insufficiency). Candidates were expected to outline the implications for fluid balance, sodium abnormalities (hypo-/hypernatremia), and haemodynamic stability.
Focus on ICU-relevant considerations was essential, with clear delineation between anterior and posterior pituitary involvement. High marks were awarded to those who addressed diagnostic approaches and appropriate hormone replacement strategies, tailored to the acute phase of critical illness.
An overarching statement may help such as:
Assessment for identifying pituitary injury in the context of TBI is complex due to overlapping features. Anterior and posterior pituitary abnormalities in the acute phase need attention with a focus on ADH and steroids. While thyroid, Sex hormones, GH and prolactin can be investigated after the patient has crossed acute phase of trauma.

Part a) – Candidates that included all components of history/examination and investigation pertinent to the pituitary injury were awarded more marks. Since it was an outline question summary of assessment was sufficient. Assessment required the candidates to mention features in history and examination that would put a patient at high risk for pituitary injury and include the clinical presentation. Candidates could score higher marks if they mentioned multimodal investigations including relevant biochemical, endocrinological and radiological investigation.
For example: assessment would include history/examination and investigation. A focused history would include –
1)    Mechanisms of injury that could subject a patient to higher risk of pituitary injury- acceleration and deceleration injury or associated base of skull fracture
2)    Clinical features suggestive of ADH/Addison’s- GCS, refractory hypotension

Part b) - Answers that included how they would manage sodium dysregulation and refractory hypotension and its effects on severe TBI scored higher marks. A safe approach to managing -SIADH, DI, hypocortisolism was expected to score good marks.
 

Interpretation

a) Assessment of suspected pituitary injury:

• History:
  • Old age
  • Front-facing deceleration injury mechanism
  • Base of skull fracture
  • Diffuse axonal injury
  • A higher severity of TBI
  • Severe shock (eg. Sheehan syndrome)
• Examination:
  • CSF rhinorrhoea
  • Clinical findings suggestive of base of skull fracture
  • Cranial nerve findings that raise suspicion of trouble around the cavernous sinus (i.e. 3d, 4th, 5th, 6th nerve palsies, and bitemporal hemianopia)
  • Unexplained shock
  • Polyuria suspicious of DI, with very dilute urine
  • Bradycardia
  • Postural hypotension
  • Unexpectedly slow neurological recovery, somnolence, lethargy
  • Unexpectedly labile blood pressure in response to stress (eg. sepsis)
• Investigations:
  • Hypernatremia or hyponatremia
  • Hyperkalemia
  • Hypoglycaemia, not otherwise explained
  • Low pituitary hormone levels
  • CTB evidence of sella turcica fracture, or a base of skull fracture more broadly
  • MRI of the pituitary is the gold standard on imaging

b) Management of suspected pituitary injury:

• Supportive management:
  • Correct electrolyte abnormalities
  • Address the associated haemodynamic problems empirically, i.e. defend the BP with noradrenaline to achieve a MAP/CPP target that will perfuse any normal pituitary tissue that is left
• Specific management:
  • Acutely, only the consequences of DI need directed management:
    • Desmopressin, or
    • Vasopressin infusion
  • If SIADH is the main manifestation:
    • fluid restriction
    • demeclocycline
    •  
  • In the long term, also hormone replacement: 
    • Hydrocortisone
    • Thyroxine
    • GH and potentially oestrogen/testosterone