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Acitretin is a metabolite of etretinate, which was used prior to the introduction of acitretin. Etretinate was discontinued because it had a narrow therapeutic index as well as a long elimination half-life (t 1/2 = 120 days), making dosing difficult. In contrast, acitretin's half-life is approximately 2 days.
Etretinate has been replaced by acitretin, the free acid (without the ethyl ester). While acitretin is less lipophilic and has a half-life of only 50 hours, it is partly metabolized to etretinate in the body, [2] so that it is still a long-acting teratogen and pregnancy is prohibited for two years after therapy. [3]
According to a study conducted by Whitcome, et al., lumbar lordosis can increase from an angle of 32 degrees at 0% fetal mass (i.e. non-pregnant women or very early in pregnancy) to 50 degrees at 100% fetal mass (very late in pregnancy). Postpartum, the angle of the lordosis declines and can reach the angle prior to pregnancy.
The MerckManual and MerckHome templates helps markup links to respectively the Professional Edition and Home Edition of the Merck Manual of Diagnosis and Therapy medical textbooks. Three parameters are required, with options (to maintain backwards compatibility) for a fourth for page number and fifth for alternative displayed text. Section number
Once a doctor decides a patient is a candidate for isotretinoin, [10] they counsel the patient to ensure they understand the drug and the potential side effects. Once the patient signs the necessary paperwork, their doctor will give them a patient ID number, ID card, and program educational materials.
Immunologic pregnancy tests were introduced in 1960 when Wide and Gemzell presented a test based on in-vitro hemagglutination inhibition. This was a first step away from in-vivo pregnancy testing [42] [43] and initiated a series of improvements in pregnancy testing leading to the contemporary at-home testing. [43]
The new study found that women who had higher levels of fluoride during pregnancy reported later that their kids were more likely to have temper tantrums, complain of vague headaches and ...
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