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Yolanda E Chávez-Viteri, Federico D Brown, Oscar D Pérez
Spiralia represents one of the main clades of bilaterally symmetrical metazoans (Bilateria). This group is of particular interest due to the remarkable conservation of its early developmental pattern despite of the high diversity of larval and adult body plans. Variations during embryogenesis are considered powerful tools to determine ancestral and derived characters under a phylogenetic framework. By direct observation of embryos cultured in vitro, we analyzed the early cleavage of the euopisthobranchs Aplysia cf...
December 29, 2016: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
Oscar A Viteri, Sean C Blackwell, Suneet P Chauhan, Jerrie S Refuerzo, Claudia Pedroza, Ximena C Salazar, Baha M Sibai
OBJECTIVE: To estimate whether antenatal corticosteroids before 34 weeks of gestation are associated with reduced incidence of respiratory distress syndrome (RDS) and composite neonatal morbidity in preterm twins. METHODS: This was a secondary analysis of a multicenter randomized trial for the prevention of preterm birth in multiple gestations. All liveborn, nonanomalous twins delivered between 24 0/7 and 36 6/7 weeks of gestation were included. Neonatal outcomes were compared between women who received antenatal corticosteroids and those who did not...
September 2016: Obstetrics and Gynecology
Oscar H Del Brutto, Robertino M Mera, Eduardo M Viteri, Joaquín Pólit, Ernesto A Ledesma, José A Cano, Karin J Plaza, Mauricio Zambrano, Aldo F Costa
BACKGROUND: Diagnosis of cerebral small vessel disease (SVD) is a challenge in remote areas where MRI is not available. Hypertensive retinopathy (HTRP) has shown to correlate with SVD in different ethnic groups, but there is no information from indigenous Latin American people. We assessed the usefulness of retinal photographs to detect cases with SVD among Amerindians living in rural Ecuador. METHODS: Atahualpa residents aged ≥60years with arterial hypertension or prehypertension were identified during a door-to-door survey...
September 1, 2016: International Journal of Cardiology
Oscar A Viteri, Jenifer Dinis, Tania Roman, Baha M Sibai
Diabetes complicates 6 to 7% of all pregnancies in the United States. Poor glycemic control is associated with multiple immediate and long-term adverse effects on both the mother and fetus. Although uniformity exists in the antenatal management of this disease, there is a paucity of evidence-based studies upon which to dictate the optimal time of delivery among affected women. The potential risks of delayed neonatal pulmonary maturation including respiratory distress syndrome and transient tachypnea of the newborn associated with early delivery must be balanced with the increased incidence of fetal demise, overgrowth, and birth injury related to diabetes in late gestations...
July 2016: American Journal of Perinatology
Oscar A Viteri, Hector Mendez-Figueroa, Claudia Pedroza, Mateo G Leon, Baha M Sibai, Suneet P Chauhan
OBJECTIVE: This study aims to compare neonatal and long-term outcomes among preterm newborns from women with reported versus those who did not report substance abuse. STUDY DESIGN: Secondary analysis of a trial of magnesium sulfate for cerebral palsy prevention. Cases were pregnant women who reported substance abuse, controls were those who denied it. Study outcomes included (1) composite neonatal morbidity, defined as any of the following: Apgar score ≤ 3 at 5 minutes, seizures, culture-proven sepsis, necrotizing enterocolitis grades 2 or 3, intraventricular hemorrhage grades 3 or 4, and/or death before discharge; (2) infant and childhood morbidity, defined as stillbirth or death by 1 year, or moderate/severe cerebral palsy by age of 2...
January 2016: American Journal of Perinatology
Mateo G Leon, Hind N Moussa, Malahat Movahedian, Oscar A Viteri, Monica Longo, Baha M Sibai
Background Desmoid tumors are benign soft tissue tumors that locally invade adjacent tissue. There is a paucity of reports describing the rapid growth of these tumors during pregnancy. Case A giant desmoid tumor arising from the left abdominal wall of a young female patient with rapid growth during pregnancy is described. Preoperative evaluation included ultrasonography and magnetic resonance imaging. Decision made by a multidisciplinary team was not to intervene before birth, and abdominal delivery at term was accomplished...
April 2015: American Journal of Perinatology Reports
Jerrie S Refuerzo, Oscar A Viteri, Maria Hutchinson, Claudia Pedroza, Sean C Blackwell, Jon E Tyson, Susan M Ramin
OBJECTIVE: We sought to compare weight loss in the first 6 weeks postpartum among women with gestational diabetes mellitus (GDM) treated with metformin or placebo, a promising therapy to reduce later risk of progression to diabetes mellitus. STUDY DESIGN: We conducted a pilot, randomized trial of metformin vs placebo in postpartum women with GDM. Women with pre-GDM, unable to tolerate metformin, resumed on insulin or oral hypoglycemic agent, delivered <34 weeks' gestation, or with a body mass index <20 kg/m(2) were excluded...
March 2015: American Journal of Obstetrics and Gynecology
Oscar A Viteri, Eleazar E Soto, Ray O Bahado-Singh, Carl W Christensen, Suneet P Chauhan, Baha M Sibai
OBJECTIVES: Substance abuse in pregnancy remains a major public health problem. Fetal teratogenicity results from the effect of these substances during fetal development, particularly when used in combination. This review will focus on and attempt to clarify the existing literature regarding the association of substance abuse on the development of congenital anomalies and the long-term implications in exposed offspring. METHODS: Systematic review of available English literature using the PubMed database of all peer-reviewed articles on the subject...
April 2015: American Journal of Perinatology
Hector Mendez-Figueroa, Joshua D Dahlke, Oscar A Viteri, Suneet P Chauhan, Dwight J Rouse, Baha M Sibai, Sean C Blackwell
OBJECTIVE: To describe the perinatal and infant and early childhood morbidity associated with preterm premature rupture of membranes (PROM) in a cohort of twin pregnancies evaluated prospectively with neonatal follow-up to 2 years of age. METHODS: This was a secondary analysis of a randomized controlled trial of magnesium sulfate for prevention of cerebral palsy. Inclusion criteria were twin gestation with preterm PROM diagnosed between 24 0/7 and 31 6/7 weeks of gestation and planned expectant management...
August 2014: Obstetrics and Gynecology
Baha M Sibai, Oscar A Viteri
Pregnancies complicated by diabetic ketoacidosis are associated with increased rates of perinatal morbidity and mortality. A high index of suspicion is required, because diabetic ketoacidosis onset in pregnancy can be insidious, usually at lower glucose levels, and often progresses more rapidly as compared with nonpregnancy. Morbidity and mortality can be reduced with early detection of precipitating factors (ie, infection, intractable vomiting, inadequate insulin management or inappropriate insulin cessation, β-sympathomimetic use, steroid administration for fetal lung maturation), prompt hospitalization, and targeted therapy with intensive monitoring...
January 2014: Obstetrics and Gynecology
John Pizzonia, Jennie Holmberg, Sean Orton, Ayesha Alvero, Oscar Viteri, William McLaughlin, Gil Feke, Gil Mor
PROBLEM Ovarian cancer stem cells (OCSCs) have been postulated as the potential source of recurrence and chemoresistance. Therefore identification of OvCSC and their complete removal is a pivotal stage for the treatment of ovarian cancer. The objective of the following study was to develop a new in vivo imaging model that allows for the detection and monitoring of OCSCs. METHOD OF STUDY  OCSCs were labeled with X-Sight 761 Nanospheres and injected intra-peritoneally (i.p.) and sub-cutaneously (s.c.) to Athymic nude mice...
January 2012: American Journal of Reproductive Immunology: AJRI
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