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Phytoprogestogens, also known as phytoprogestins, are phytochemicals (that is, naturally occurring, plant-derived chemicals) with progestogenic effects. [1] [2]Relative to their phytoestrogen counterparts, phytoprogestogens are rare. [1]
Pyometra is a result of hormonal and structural changes in the uterus lining. This can happen at any age, regardless of how many heat cycles have occurred or previous pregnancies (or lack thereof), although it becomes more common as the dog gets older. The main risk period for a female is for eight weeks after her peak standing heat has ended. [2]
Allopregnanolone is a naturally occurring neurosteroid which is made in the body from the hormone progesterone. [10] [11] As a medication, allopregnanolone is referred to as brexanolone, sold under the brand name Zulresso, [6] [12] and used to treat postpartum depression. [11] [13] [14] It is given by injection into a vein. [11] [6]
Estriol (E3), sold under the brand name Ovestin among others, is an estrogen medication and naturally occurring steroid hormone which is used in menopausal hormone therapy. [12] [4] [6] [13] It is also used in veterinary medicine as Incurin to treat urinary incontinence due to estrogen deficiency in dogs.
Progesterone is the major progestogen produced by the corpus luteum of the ovary in all mammalian species. Luteal cells possess the necessary enzymes to convert cholesterol to pregnenolone, which is subsequently converted into progesterone. Progesterone is highest in the diestrus phase of the estrous cycle.
Ovulation occurs 24–48 hours after the luteinizing hormone peak, which occurs around the fourth day of estrus; therefore, this is the best time to begin breeding. Proestrus bleeding in dogs is common and is believed to be caused by diapedesis of red blood cells from the blood vessels due to the increase of the estradiol-17β hormone. [20]
[92] [122] However, oral progesterone achieves very low progesterone levels and has relatively weak progestogenic effects, which might be responsible for the absence of increase in VTE risk. [122] Parenteral progesterone, such as vaginal or injectable progesterone, which can achieve luteal-phase levels of progesterone and associated ...
The book criticizes estrogen replacement therapy and proposes the use of "natural progesterone" for menopausal women in order to alleviate a variety of complaints. Lee's theories have been criticized for being inadequately supported through science, being primarily based on anecdotal evidence with no rigorous research to support them. [ 4 ]