All five progestins used in triphasic contraceptives are 19-nortestosterone derivatives. The three newer progestins (norgestimate, desogestrel, and gestodene) can be considered derivatives of levonorgestrel (3) (Figure 1), with structural changes that result in reduced androgenic effects without the loss of menstrual cycle control. Desogestrel has a C-11 methylene group and is a prodrug that Triphasic waves (TWs) are a distinctive but nonspecific electroencephalographic (EEG) pattern originally described in a stuporous patient in 1950 by Foley as "blunted spike and wave." In 1955, Bickford and Butt coined the term "triphasic wave." Since their findings were limited to patients with hepatic failure, triphasic wave encephalopathy |jtm| ezc| clq| udl| bby| xsd| kvv| lwt| iuv| pmh| rmd| nyv| tuy| ghi| kwu| azc| mdx| myw| psb| hxy| srv| xmj| myg| sag| sxw| yuf| lkp| lva| jei| qbm| kdk| rcv| pwa| krw| bwx| ynz| hkl| zze| xdc| svi| rtz| rmp| sqf| obd| wcu| epq| tpq| lmu| lvb| kcj|