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Biomedical subjects

John Tzafettas

Publications and source records attributed to John Tzafettas.

2 recordsLinked to original sources

Painful menstruation.

Painful menstruation is a cyclic painful condition that adversely affects the woman's wellbeing for a large part of her life. Its pathogenesis is not always understood. Prostaglandins seem to be intimately involved in primary dysmenorrhoea although it is difficult to understand the underlying cause for their excessive secretion. Abnormalities in plasma steroid levels could account for the disturbance, especially significantly elevated plasma levels of estradiol in the luteal phase. Plasma levels of vasopressin appear to be higher in women with dysmenorrhea suggesting a possible aetiological role in the uterine prostaglandin synthesis. The main aim of diagnosis is to distinguish those cases with secondary dysmenorrhoea due to endometriosis and chronic pelvic inflammatory disease and treat them accordingly although the exact role of endometriosis remains unclear. The development of sonographic and magnetic resonance imaging techniques (MRI) allow pre-operative diagnosis of adenomyosis, a difficult to diagnose cause of dysmenorrhea and pelvic pain. Medication is usually required for all cases of moderate to severe painful menstruation. Apart from pharmacological agents, several techniques have been used including relaxation therapy, hypnosis, manipulation, psychotherapy, acupuncture, biofeedback techniques, surgery e.g. Despite the high prevalence of painful menstruation, its frequency and severity is very often underestimated.

Adolescent↗

Adenosine deaminase activity and its isoenzyme pattern in women with recurrent spontaneous abortions.

Normal pregnancy is characterized by suppressed cell-mediated immunity. Adenosine deaminase (ADA) is a purine metabolic enzyme enriched in trophoblast cells of the placenta. It is an early marker of trophoblast cell differentiation. Also, the activation of ADA gene expression in the placenta is crucial and essential for proper fetal development. The activity of ADA shows changes in diseases characterized by the alteration of cell-mediated immunity. The purpose of this study was to assess the possible role of the alteration of cell-mediated immunity in women with recurrent spontaneous abortions (RSA) as a cause of changes in tADA activity, and also to evaluate the extent of the contribution of ADA1 and ADA2 to changes of tADA activity in serum and peripheral blood lymphocytes (PBLs). We measured in serum and in PBLs activities of tADA, ADA1 and ADA2 of 25 married women with RSA (group A) and of 28 healthy non-pregnant women (group B). According to our results in women with RSA, mean serum tADA, ADA1 and ADA2 activities were significantly higher than those of non-pregnant women (p < 0.001, p < 0.05 and p < 0.05 respectively). In women with RSA, mean PBLs tADA, ADA1 and ADA2 activities were significantly higher than those of non-pregnant women (p < 0.001, p < 0.05 and p < 0.05 respectively). The findings of this study show a marked increase of serum and PBLs ADA activities, which is derived from an increase of ADA2 and ADA1 activity in women with RSA. These changes reflect cell-mediated immunological changes.

Abortion, Habitual↗