NAION Flashcards
What topical medication should not be used if patient has suspected NAION?
Phenylephrine
What blood supply supplies the anterior portion of the ON?
SPCAs
What lab test should be run for NAION recognition?
- CRP
- ESR
- Platelet Count (Thrombocytosis)
- CBC w/ diff
- FA (Choroidal filling delay)
What is the visual loss for ON? How long does it take to notice it?
VA = 20/200-NLP
~ 5 days
Are hemorrhages present in ON? Pain?
- No hemorrhages
2. Pain! precedes visual loss
What are the predisposing factors for NAION?
- Small crowded disc
- Metabolic syn.
- Genetic
- Sleep Apnea
What is the main cause of NAION?
BP falls too low:
- medically induced or nocturnal
What medications can cause NAION?
- Amiodarone
- Viagra, Cialis
- Flu Vaccine
What is the visual loss in NAION? How long to recognize it?
- 50% = better than 20/64
- 34% = worse than 20/200
- Takes 3-4 days
What is the main VF defect seen in an NAION?
Altitudinal Defect or Secocentral defect
To determine if affected eye is by NAION, what should you look for in the fellow eye?
- Anomalous disc
- if cupped, think AAION - 18% of fellow eyes are affected
What should we tell our patients with NAION?
- No tx
- stop smoking
- Avoid hypertensives
Are hemorrhages found in NAION? Pain?
Yes hemes
No pain
Are hemes found in AAION? Pain?
Sometimes hemes
Yes pain
What is the visual acuity for an AAION patient?
20/200-NLP
