In myasthenia gravis I understand patients need anitcholinesterases, so why are they given atropine which is an antimuscarinic?
Atropine is only used intravenously during the diagnostic phase of the edroponium test. This has potentially life threatening side effects in a small number of cases and by giving atropine the muscarinic side effects are minimalised. Q: Visual Fields: Just wondering if you could help me with age-norm thresholds for field testing. In Henson’s book on visual fields it says sensitivity reduces with age by 0.6dB per decade, but no starting value. Besides this, I have been unable to find any other info about what constitutes a normal threshold for each decade. On Humphreys total and pattern deviation plots compare to age norms but I need to know for the other types of plots. A: There are a couple of points here that you need to be aware of: 1) dB scales are scales of attenuation not of intensity. 32dB on one instrument is not necessarily the same as 32dB on another instrument. Each instrument has a base line intensity, in the Humphrey it is 10,000 apostilbs and in the Henson it is 1000cd/m2
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