Preterm Labor

Preterm birth is defined as any birth occurring before the end of 37 weeks of gestation. The incidence is between 8% and 10% of all births, and preterm births account for more than 60% of non-anomalous-related neonatal mortality and morbidity. Most neonatal mortality occurs in those preterm deliveries that occur between 20 and 30 weeks of gestation (or in infants weighing less than 1,500 g). Survival of neonates delivered at tertiary care centers has improved yearly, particularly for those pregnancies ending at 25-32 weeks of gestation. Significant increases in survival rates occur at 25-26 weeks (20% at 24 weeks to 50% at 26 weeks.) Long-term impairment has remained high for those survivors delivered at 25 weeks of gestation and earlier.
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The cause of preterm labor is unknown in most patients. Multiple risk factors, however, have been reported to be associated with an increased likelihood of subsequent preterm labor: multiple gestation (40-50%), previous preterm labor or delivery (20-50% recurrence), diethylstilbestrol exposure, hydramnios, uterine anomalies, previous cone biopsy, previous second-trimester losses, cervical dilatation and effacement before 32 weeks of gestation, excessive preterm uterine activity, and placenta previa. Risk factors include low socioeconomic status and extremes of age (less than age 18 and greater than age 40 years). In addition, it is now recognized that perhaps as many as one fifth of spontaneous preterm births may be complicated by intrauterine or extrauterine infections. Finally, cervical vaginal infections such as bacterial vaginosis, if untreated, also place the patient at greater risk.
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Subclinical chorioamnionitis has emerged as a possible significant cause of preterm birth. Many cases of preterm PROM, as well as up to one fourth of cases of idiopathic preterm birth, may be due to subclinical intraamniotic infection. Bacterial products such as lipopolysaccharide can be identified in the amniotic fluid without other evidence of infection. Furthermore, endogenous host products (cytokines) secreted in response to infection can also be identified in the amniotic fluid of these pregnancies. These cytokines, including interleukin-1, interleukin-6, interleukin-8, and tumor necrosis factor (cachectin), are secretory products of macrophage activation. Additionally, amniotic fluid platelet-activating factor may be synergistically involved in activating the cytokine network.
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Numerous risk-scoring systems based on the aforementioned factors have been proposed but found to be of no benefit in identifying women who deliver preterm. There are no biochemical tests currently proven to predict preterm labor, although preliminary studies suggest cervicovaginal fetal fibronectin may be a marker for impending preterm labor. Intermittent daily monitoring of uterine activity in the outpatient setting has shown that otherwise silent contractions of more than six per hour are associated with preterm labor, but monitoring did not prevent preterm birth.