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| Author | Subject: diurnal variation |
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 ts
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diurnal variation
Jun 26, 2005 12:38:54 When should you be suspicious about the variance in IOPs at morning & at night?
Is the variance different between POAG & NTG? |
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ljc
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RE: diurnal variation
Jun 26, 2005 14:34:56 Don't have references for this to hand, but i think variation of 3 -4 mmHg in normals, variation of up to 8mmHg in glaucoma. I'm not sure if this would include NTG. |
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has
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RE: diurnal variation
Jun 26, 2005 21:24:46 greater or equal to five is suspicous |
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Michael
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RE: diurnal variation
Jun 28, 2005 13:09:51 > 10 mmHg is traditionally saide to be diagnostic of POAG.
As for at what level should your suspicions be aroused, well there is no absolute, it depends on the clinical context , that is, the presence of other risk factors FH/ONH/VF.
Re NTGs. Strictly, the diurnal range of IOP must be known before the diagnosis can be made, else a 15 mmHg in the office (sorry for the American) may be spiking at 30mmHg in the evening and thus be POAG (a range of >20mmHg is occasionally found/looked for in POAG).
With true NTG the range of IOPs is typically less than in POAG.
If asked in the PQE's I suspect/hope examiners would be looking for an awareness of the fallibility in using one test in isolation. |