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Rabi Y.,University of Calgary | Rabi Y.,Alberta Childrens Hospital Research Institute | Lodha A.,University of Calgary | Lodha A.,Alberta Childrens Hospital Research Institute | And 7 more authors.
Resuscitation | Year: 2015

Background: After 2006 most neonatal intensive care units (NICUs) in Canada stopped initiating newborn resuscitation with 100% oxygen. Methods: In this retrospective cohort study, we compared neonatal outcomes in infants born at ≤27 weeks gestation that received <100% oxygen (OXtitrate group, typically 21-40% oxygen) during delivery room resuscitation to infants that received 100% oxygen (OX100 group). Results: Data from 17 NICUs included 2326 infants, 1244 in the OXtitrate group and 1082 in the OX100 group. The adjusted odds ratio (AOR) for the primary outcome of severe neurologic injury or death was higher in the OXtitrate group compared with the OX100 group (AOR 1.36; 95% CI 1.11, 1.66). A similar increase was also noted when comparing infants initially resuscitated with room air to the OX100 group (AOR 1.33; 95% CI 1.04, 1.69). Infants in the OXtitrate group were less likely to have received either medical or surgical treatment for a patent ductus arteriosus (AOR 0.53; 95% CI 0.37, 0.74). Conclusions: In Canadian NICUs, we observed a higher risk of severe neurologic injury or death among preterm infants of ≤27 weeks gestation following a change in practice to initiating resuscitation with either room air or an intermediate oxygen concentration. © 2015 Elsevier Ireland Ltd. Source


Arzola C.,University of Toronto | Carvalho J.C.A.,University of Toronto | Cubillos J.,University of Toronto | Ye X.Y.,Maternal Infant Care Research Center | Perlas A.,University of Toronto
Canadian Journal of Anesthesia | Year: 2013

Purpose: Focused assessment of the gastric antrum by ultrasound is a feasible tool to evaluate the quality of the stomach content. We aimed to determine the amount of training an anesthesiologist would need to achieve competence in the bedside ultrasound technique for qualitative assessment of gastric content. Methods: Six anesthesiologists underwent a teaching intervention followed by a formative assessment; then learning curves were constructed. Participants received didactic teaching (reading material, picture library, and lecture) and an interactive hands-on workshop on live models directed by an expert sonographer. The participants were instructed on how to perform a systematic qualitative assessment to diagnose one of three distinct categories of gastric content (empty, clear fluid, solid) in healthy volunteers. Individual learning curves were constructed using the cumulative sum method, and competence was defined as a 90% success rate in a series of ultrasound examinations. A predictive model was further developed based on the entire cohort performance to determine the number of cases required to achieve a 95% success rate. Results: Each anesthesiologist performed 30 ultrasound examinations (a total of 180 assessments), and three of the six participants achieved competence. The average number of cases required to achieve 90% and 95% success rates was estimated to be 24 and 33, respectively. Conclusion: With appropriate training and supervision, it is estimated that anesthesiologists will achieve a 95% success rate in bedside qualitative ultrasound assessment after performing approximately 33 examinations. © 2013 Canadian Anesthesiologists' Society. Source


Srinivasjois R.M.,University of Western Australia | Shah S.,Sinai University | Shah P.S.,Sinai University | Shah P.S.,Maternal Infant Care Research Center | Shah P.S.,University of Toronto
Acta Obstetricia et Gynecologica Scandinavica | Year: 2012

Background. Differences in birth outcomes such as low birthweight (LBW), preterm births (PTB), stillbirth, differences in birthweight in Black vs. White race are well known. Infants born to biracial parents (mother and father from either Black or White races) also experience higher adverse birth outcomes. Objective. To systematically review and meta-analyze birth outcomes among parents of mixed racial background compared to parents of same race. Search strategy. Medline, Embase, CINAHL and bibliographies of identified articles were searched for English language studies. Selection criteria. Studies reporting association between parental mixed racial status and LBW, PTB, or small-for-gestational age (SGA) outcomes were included. Data collection and analyses. After exclusion of duplicate cohorts in different publications, data from White mother-Black father (WMBF), Black mother-White father (BMWF) and Black mother-Black father (BMBF) groups were compared with the White mother-White father (WMWF) group. Results. Eight English language studies from of 26 335 596 singleton births were included and reviewed. Compared to the WMWF group, the adjusted odds ratio (95% confidence intervals) were: (a) low birthweight; 1.21 (1.10-1.33) for WMBF, 1.75(1.64-1.87) for BMWF, and 2.08 (1.81-2.38) for BMBF; (b) preterm births; 1.17 (1.05-1.31) for WMBF, 1.37 (1.18-1.59) for BMWF, and 1.78 (1.59-2.00) for BMBF; and (c) stillbirths; 1.43 (0.92-2.21) for WMBF, 1.51 (1.09-2.08) for BMWF, and 1.85 (1.47-2.32) for BMBF. Conclusion. Biracial status of parents was associated with higher risk for adverse pregnancy outcomes than both White parents but lower than both Black parents, with maternal race having a greater influence than paternal race on pregnancy outcomes. © 2012 Nordic Federation of Societies of Obstetrics and Gynecology. Source


Shah P.S.,Mount Sinai Hospital | Shah P.S.,University of Toronto | Shah P.S.,Maternal Infant Care Research Center | Balkhair T.,Mount Sinai Hospital
Environment International | Year: 2011

Background: Several mechanisms are suspected to underlie adverse birth outcomes among mothers exposed to air pollutants, including inflammation, direct toxic effects on fetuses and the placenta, displacement of the oxygen-hemoglobin dissociation curve, and formation of DNA adducts. Objective: To systematically review the association between air pollutants and birth outcomes of low birth weight (LBW), preterm (PTB) and small for gestational age (SGA) births. Methods: Electronic databases and bibliographies of identified articles were searched for English language studies reporting on birth outcomes. Included studies were assessed for risks of bias in the selection, exposure assessment, confounder adjustment, analyses, outcomes assessment, and attrition. Unadjusted and adjusted estimates from included studies were extracted. Methodological differences between the studies were evaluated. Results: A total of 41 studies, mostly with a moderate risk of biases due to indirect assessment methods employed, met the eligibility criteria. Exposure to sulphur dioxide was associated with PTB, exposure to fine particulate matter (PM) of M5G 1X52.5μM was associated with LBW, PTB and SGA births, and exposure to coarse PM of M5G 1X510μM was associated with SGA births. The evidence for nitrous oxide, nitrogen dioxide, ozone and carbon monoxide was inconclusive. Conclusions: Reported associations, and lack thereof, between individual air pollutants and birth outcomes have differed across published studies. This heterogeneity and/or absence of association may be due to difficulty in quantifying exposure, method of ascertainment, time of measurement and collinearity between pollutants. Important future research directions include developing improved methods to detect the duration and intensity of exposure, including entire populations, as well as performing well-designed nested studies that ascertain complete outcomes, avoiding residual confounding, and adjusting for residential mobility. © 2010 Elsevier Ltd. Source


Hossain S.,University of New South Wales | Shah P.S.,University of Toronto | Shah P.S.,Maternal Infant Care Research Center | Ye X.Y.,Maternal Infant Care Research Center | And 4 more authors.
Journal of Paediatrics and Child Health | Year: 2015

Aim To compare risk-adjusted neonatal intensive care unit outcomes between regions of similar population demography and health-care systems in Australia-New Zealand and Canada to generate meaningful hypothesis for outcome improvements. Methods Retrospective study of data from preterm infants (<32 weeks gestational age) cared for in 29 ANZNN (Australian and New Zealand Neonatal Network) and 26 Canadian Neonatal Network (CNN) intensive care unit admitted between 2005 and 2007. Moribund infants or those with major congenital malformation were excluded. Results The 9995 ANZNN infants had a higher gestational age (29 vs. 28 weeks, P < 0.0001), lower rate of outborn status (13.2% vs. 19.1%, P < 0.0001) and Apgar score <7 at 5-min (14.8% vs. 21.6%, P < 0.0001) than their 7141 CNN counterparts. After adjustment, ANZNN and CNN infants had a similar likelihood of survival (adjusted odds ratio (AOR) 1.01 (0.88, 1.16)), but ANZNN infants were at lower risk of severe retinopathy (AOR 0.71 (0.61, 0.83)), severe ultrasound neurological injury (AOR 0.68 (0.59, 0.78)), necrotising enterocolitis (AOR 0.65 (0.56, 0.76)), chronic lung disease (AOR 0.67 (0.62, 0.73)) and late-onset sepsis (AOR 0.83 (0.76, 0.91)). ANZNN infants were at a higher risk of pulmonary air leak (AOR 1.20 (1.01, 1.42)), early-onset sepsis (AOR 1.33 (1.02, 1.74)). More ANZNN infants received any respiratory support (AOR 1.27 (1.14, 1.41)) and continuous positive airway pressure as sole respiratory support (AOR 2.50 (2.27, 2.70)). Conclusions Despite similarities in settings, ANZNN infants fared better in most measures. Outcome disparities may be related to differences in tertiary service provision, referral and clinical practices. © 2015 The Authors. Journal of Paediatrics and Child Health © 2015 Paediatrics and Child Health Division (Royal Australasian College of Physicians). Source

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