Browsing Life Sciences by Author "O'Donovan, Peter J."
Lipidomic analysis reveals prostanoid profiles in human term pregnant myometrium.Durn, Joanne H.; Marshall, Kay M.; Farrar, D.; O'Donovan, Peter J.; Scally, Andy J.; Woodward, D.F.; Nicolaou, Anna (Elsevier, 2010)Prostanoids modulate the activity of human pregnant myometrium and their functional role can be appreciated through characterisation of prostanoid receptors and tissue concentration of prostanoids. We have applied a lipidomic approach to elucidate the profile of prostanoids in human non-labouring and labouring myometrium. We have identified a total of nineteen prostanoids including prostacyclin, thromboxanes, prostaglandins and dihydro-prostaglandins. Prostacyclin was the predominant prostanoid in both non-labouring and labouring myometria, with PGD2 and PGF2¿ being the second most abundant. Although the total amount of prostanoids was increased in the labouring tissue, PGE2 and 13,14-dihydro-15-keto-PGE2 were the only prostanoids to increase significantly at early and late labour (p¿0.001). Our data suggest that PGF2¿ plays an important role in parturition, whilst the increase in PGE2 could occur to facilitate cervical dilation and relaxation of the lower myometrium during labour. Although the elevation in TXA2 was less marked than expected, in terms of translation to function even a relatively small increase in the level of this potent spasmogen may have significant effects.
Selecting distending medium for out-patient hysteroscopy. Does it really matter?O'Donovan, Peter J.; Kaponis, A.; Makrydimas, G.; Paschopoulos, M.; Zikopoulos, K.; Alamanos, Y.; Paraskevaidis, E. (2004)The aim of this prospective randomized study was to evaluate the role of carbon dioxide (CO2) and normal saline for diagnostic accuracy in out-patient hysteroscopy. Women admitted to our Department in order to undergo total abdominal hysterectomy also underwent diagnostic hysteroscopy, 12¿24 h prior to surgery. The selection of distending medium was made after randomization. Two groups of patients were formed, group A (CO2; n=39) and group B (normal saline; n=35). More than half of the women in the study population were post-menopausal. Post-hysteroscopy, all women were asked to rank any symptom that they felt during the procedure on a 4-point scale (0 = none; 1 = mild; 2 = severe; 3 = inability to perform hysteroscopy). The hysteroscopic diagnosis was compared with the macroscopic findings and the histological examination of the surgical specimen after hysterectomy. The percentage who completed hysteroscopy was 89.74% within group A and 97.14% within group B. Most patients of both groups felt some pain of mild intensity. The diagnostic accuracy of hysteroscopy was similar for both media when major pathology [large polyps (group A 91.7%; group B 92.7%), myomas (group A 81.25%; group B 92.7%) and/or hyperplasia (group A 87.5%; group B 90.2%)] of the endometrial cavity was detected. In contrast, in cases of minor pathology (small polyps, mucosal elevations, crypts, hypervascularization), hysteroscopy with saline presented with significantly higher diagnostic accuracy (85.4%) compared with hysteroscopy with CO2 (64.6%). In out-patient hysteroscopy, CO2 and normal saline were comparable with regard to patient discomfort and for the detection of major pathology of the endometrial cavity. Normal saline seems to be the most appropriate medium for the detection of minor pathology of the endometrial cavity.