Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0728731 (prematurity)
 7,134 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Current tocolytic protocols rely largely on the use of beta-mimetics to induce myometrial quiescence and delay delivery. Unfortunately, the rapid transplacental passage and poor receptor specificity of the commonly used beta-mimetics results in widespread activation of intrauterine and extrauterine beta 1 and beta 2 receptors. The use of beta-mimetics is associated with a range of well-recognized and potentially dangerous side effects for mother and fetus. The value of continued use of beta-agonists after obtaining uterine quiescence also has been the subject of recent debate. In this article we have attempted to explore the biochemical and molecular rationale for the use of alternative therapeutic modalities in the treatment and prevention of PTL. In the light of the current view that the term "preterm labor" covers a considerable diversity of causes, we propose that a range of treatment regimes should be chosen on the basis of the diagnosis and classification of the patient according to the their particular condition. Although the measurement of several biochemical parameters have been suggested to be of use in predicting PTL, we believe that a panel of diagnostic indicators (e.g., free or total CRH, IL-6, extracellular matrix proteases, fetal fibronectin) is more likely to provide useful diagnostic information on which appropriate treatment modalities can be selected (Table 1). Because of the complex and interactive nature of the mechanisms operating within the intrauterine environment to regulate myometrial activation and uterotonin production, we speculate that a combination of tocolytics, anti-inflammatory agents, uterotonic antagonists, and receptor blockers is likely to be more effective than a monotherapeutic approach, which focuses on only one facet of the process of uterine activation for pharmacologic intervention. For example, the use of antibiotics, PGHS inhibitors, and/or beta-mimetics might be an appropriate first line of treatment for infection-associated PTL in extreme prematurity. If it is successful, this treatment might be followed by longer term use of a progestagen and/or NO donor to maintain myometrial quiescence until closer to term. Alternatively, use of progesterone or oxytocin antagonists may be effective in augmenting the actions of beta-mimetics while reducing their side effects, whereas other combinations may be useful as long-term prophylactics in women with a high risk of developing PTL. Improvements continue in our diagnostic ability to correctly identify the different causes of preterm labor. We anticipate that careful selection of differing combinations of therapeutic options will result in significant reductions in the morbidity, mortality, and healthcare costs associated with preterm birth.
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PMID:The molecular mechanisms of term and preterm labor: recent progress and clinical implications. 932 26

The aim of this study is to clarify the usefulness of amplitude spectral analysis for the evaluation of maturational changes of theta, alpha, and beta activities in preterm infants. We chose 10 healthy infants, who were born without complications other than prematurity, who were 29-30 weeks, 31-32 weeks, and 33-34 weeks of postconceptional age, respectively, at time of electroencephalogram recordings. Fast Fourier transform algorithm was applied for amplitude spectral analysis. The analyzed data were divided into five frequency bands: theta 1 4-6 Hz, theta 2 6-8 Hz, alpha 8-13 Hz, beta 1 13-20 Hz, and beta 2 20-30 Hz. The average amplitude of six segments with continuous patterns with high-voltage slow waves of preterm infants was calculated in each frequency band. A significant reduction of the amplitude along with postconceptional age was present in all leads in theta 1 and theta 2 bands. On the other hand, a significant correlation with postconceptional age was not observed in alpha, beta 1, or beta 2 bands. In conclusion, maturational electroencephalographic changes assessed by amplitude spectral analysis were prominent in theta activities and were not remarkable in alpha or beta activities.
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PMID:Amplitude spectral analysis of theta/alpha/beta waves in preterm infants. 1637 75