Browsing by Author "Espinoza, J"

Now showing 1 - 5 of 5
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    A short cervix in women with preterm labor and intact membranes: A risk factor for microbial invasion of the amniotic cavity
    (MOSBY-ELSEVIER, 2005) Gomez, R; Romero, R; Nien, JK; Chaiworapongsa, T; Medina, L; Kim, YM; Yoon, BH; Carstens, M; Espinoza, J; Iams, JD; Gonzalez, R
    Objective: The purpose of this study was to determine whether there was a relationship between sonographic cervical length and the presence of culture-proven microbial invasion of the ammotic cavity in women with preterm labor and intact membranes.
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    A simple control scheme for hybrid active power filter
    (INST ENGINEERING TECHNOLOGY-IET, 2002) Rivas, D; Moran, L; Dixon, J; Espinoza, J
    A simple control scheme for hybrid active power filters connected in parallel is presented and analysed. The hybrid active power filter combines the compensation characteristics of resonant passive and active power filters. The series active power filter is implemented with a three-phase pluse-width modular (PWM) voltage-source inverter. The proposed scheme is able to compensate displacement power factor and current harmonics simultaneously. The combination of passive and active power filters allows a better performance compensation of high-power nonlinear loads. The proposed control scheme is discussed in tenus of principles of operations under steady-state and transient conditions. The design and implementation of the power and control circuits are reported. Finally, key predicted results are verified experimentally on a 5 kVA prototype model.
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    A sonographic short cervix as the only clinical manifestation of intra-amniotic infection
    (2006) Hassan, S; Romero, R; Hendler, I; Gomez, R; Khalek, N; Espinoza, J; Nien, JK; Berry, SM; Bujold, E; Camacho, N; Sorokin, Y
    Objective: A sonographically short cervix is a powerful predictor of spontaneous preterm delivery. However, the etiology and optimal management of a patient with a short cervix in the mid-trimester of pregnancy remain uncertain. Microbial invasion of the amniotic cavity (MIAC) and intra-amniotic inflammation are frequently present in patients with spontaneous preterm labor or acute cervical insufficiency. This study was conducted to determine the rate of MIAC and intra-amniotic inflammation in patients with a cervical length < 25 mm in the mid-trimester.
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    Idiopathic vaginal bleeding during pregnancy as the only clinical manifestation of intrauterine infection
    (TAYLOR & FRANCIS LTD, 2005) Gomez, R; Romero, R; Nien, JK; Medina, L; Carstens, M; Kim, YM; Chaiworapongsa, T; Espinoza, J; Gonzalez, R
    Objective. To determine the frequency and clinical significance of microbial invasion of the amniotic cavity (MIAC) in patients with vaginal bleeding in the absence of placenta previa, preterm labor or preterm premature rupture of membranes (PROM).
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    The prevalence and clinical significance of amniotic fluid 'sludge' in patients with preterm labor and intact membranes
    (WILEY, 2005) Espinoza, J; Goncalves, LF; Romero, R; Nien, JK; Stites, S; Kim, YM; Hassan, S; Gomez, R; Yoon, BH; Chaiworapongsa, T; Lee, W; Mazor, M
    Objective To determine the prevalence and clinical significance of amniotic fluid (AF) 'sludge' observed during transvaginal ultrasound examination of the cervix in patients with preterm labor and intact membranes, and in those with uncomplicated pregnancies.