1 Pituitary deficiencies following head injury – a patient case Sue Cox Endocrine CNS Torbay hospital

2 Patient 42 year old male Married Unemployed Ex smoker Moderate alcohol

3 Medical History Hayfever Crush injury right arm Asymptomatic proteinuria Familial hypercholesterolaemia (Jan 06) Assault #skull and left frontal subdural haematoma Legionnaires 2005 DVT 2005

4 Presentation Oct 04 (approx 2 weeks after head injury) Polydipsia pints/day Polyuria Nocturia 1-10/night (avg 3-4) Tired, cold Headaches Loss of smell and taste Loss of appetite

5 Investigations 24 hour urine volume Urine osmolality* Serum osmolality* Sodium FSH LH Testosterone Cortisol TSH IGF-1 MRI 5.25L 106 ( ) 311 (281 – 297) 151 (132 – 144) 3.2 (0 – 10) 5.6 (0 – 10) (8 – 29) 419 (10.00 am) 1.80 (0.35 – 5.5) 156 (90 – 360) Normal appearance of pituitary

6 Conclusion Cranial Diabetes Inspidues secondary to head injury Started Desmopressin Urine volume improved – 1.5 L Drinking less Nocturia resolved However………………

7 There’s more Dec 06 Limb weakness Memory problems Dizziness General fatigue Tiredness CT scan Cerebral atrophy & left frontal lobe damage Synacthen test = normal Gonadotrophins and testosterone = normal Free T4 – low 9.4 (n = )

8 Feb 07 Free T4 = 10 Start T4 50 mcg Plan for GH stimulation test GHRH/Arginine (Sept 07) Peak GH = 37 IGF-1 = 248 (9 – 40) ?? False negative Proceed to Glucagon Peak GH = 0.9 (mu/l) IGF-1 = 18.1 AGDHA score = 24/25

9 Where are we now Desmopressin 200 mcg tds T4 50mcg od Cortisol = normal response during Glucagon Testosterone normal Started GH replacement March 08 IGF-1 – normalised June 08

10 Any questions?