Wednesday, 3 November 2010

MRCP revision battle 41.1: Horner's syndrome

Today is another day of completely random battles... with a mnemonic of a addicts hammock and some fevers of unknown cause hopefully each battle should have something of interest in it...


MRCP revision battle 41.1: Horner's syndrome
MRCP revision battle 41.2: Gynaecomastia
MRCP revision battle 41.3: Gingival Hyperplasia
MRCP revision battle 41.4: Leptospirosis
MRCP revision battle 41.5: Opioid and benzo conversions
MRCP revision battle 41.6: Pyrexia of unknown origin
MRCP revision battle 41.7: Fitness to fly



MRCP revision battle 41.1: Horner's syndrome

Horner's syndrome is the triad of:
  • miosis
  • ptosis
  • anhydrosis

 It is caused by an interruption of the sympathetic pupillomotor fibres



Causes may be:
  • central - which causes anhydrosis of the face, arm and trunk
  • pre-ganglionic = second order - which causes anhydrosis of face
  • post-ganglionic = third order - which causes no anhydrosis

A general way to remember the causes is PC Stem:
  • pancoast tumour
  • cervical rib
  • cluster headache
  • carotid artery dissection
  • stroke
  • syringomyelia
  • trauma
  • thyroidectomy
  • encephalitis
  • multiple sclerosis

 An alternative way to try and learn them by their location is:
  • central: STEMS 
    • stroke
    • tumour
    • encephalitis
    • multiple sclerosis
    • syringomyelia
  • pre-ganglionic: PCT
    • pancoast tumour
    • cervical rib
    • trauma
    • thyroidectomy
  • post ganglionic: 2Cs
    • carotid artery dissection
    • cluster headache

Now for some big breasts...