Purpose: To determine the timing of first ambulation during hospitalization among patients admitted for acute myocardial infarction (AMI) and to identify the predictors of first ambulation. Methods: This retrospective cohort study included 500 AMI patients admitted during 2004 to one of three hospitals that form the Hamilton Health Sciences Corporation in Hamilton, Ontario, Canada. The patients were randomly selected from a total of 1,014 charts from the Hamilton Health Sciences Computerized Health Records (SOVERA). Using a chart abstraction tool, the following data were collected from each patient's chart: demographic information, past medical history, treatment, complications, and patterns of ambulation while in hospital. The primary outcome was first ambulation, defined as the first time patients walked during their hospital stay. Secondary outcomes included heart rate at discharge and mortality during hospitalization. The relationship between patient and care-related factors and the time of first ambulation after AMI was explored through a time to event analysis using Cox regression; the associations were expressed as hazard ratios. The fit for the proportional hazard model was assessed and a stratified proportional hazard model was performed for age. Results: Of the 500 charts, 60 were excluded. Of the 440 patients who were included in the final analysis, 340 (77.3%) walked during hospitalization. One hundred fifteen (26.1 %) walked during the first 48 hours (early walking), 98 (22.3%) walked between 49-96 hours (intermediate walking), and 127 (28.9%) walked after 96 hours (late walking). A total of 100 patients (22.7%) were categorized as non-walkers. Factors that emerged in the survival analysis that were positively associated with early ambulation after AMI and that proved the proportionality on the assessment of the fit of the model were: having a family history of cardiovascular disease (HR 1.33; 95% Cl 1.00, 1.44; p=0.05), receiving thrombolysis (HR 1.47; 95% Cl 1.11, 1.49; p=0.007), receiving nitroglycerin (HR 1.51; 95% Cl 1.19, 1.93; p<0.001 ), and taking calcium channel blockers (HR 1.58; 95% Cl 1.22, 2.05; p<0.001 ). Factors that were negatively associated with early ambulation after AMI were age >59 years (HR 0.98; 95% Cl 0.97, 0.99; p<0.001 ), having an arrhythmia in-hospital (HR 0.48; 95% Cl 0.22, 0.94; p=0.04), taking inotropic drugs (HR 0.72; 95% Cl 0.53, 0.98; p<0.001 ), and undergoing coronary artery bypass surgery (HR 0.51; 95% Cl 0.33, 0.78; p=0.002). Conclusion: There is variability in the timing of first ambulation among patients hospitalized with an AMI. Furthermore, those who walked early were more likely to have a family history of cardiovascular disease, have received thrombolysis, and be taking nitroglycerin or calcium channel blockers. Those least likely to walk early were older (>59 years), were more likely to have had an arrhythmia inhospital, to be taking inotropic drugs, and to have undergone coronary artery bypass surgery. / Thesis / Doctor of Philosophy (PhD)

Les études sur les couples traités par fécondation in vitro (FIV) ont jusqu’à présent porté essentiellement sur l’évaluation du succès en FIV. Très peu de données sont disponibles sur le devenir à long terme de couples traités par FIV. L’objectif de ce travail était d’estimer la fréquence de réalisation du projet parental à long terme, et d’étudier les facteurs associés aux interruptions précoces des traitements et aux naissances naturelles.L’enquête DAIFI-2009 a inclus 6 507 couples ayant débuté un programme de FIV en 2000-2002 dans l’un des 8 centres de FIV participant à l’étude. Les données médicales des couples et leur parcours dans le centre ont été obtenus à partir des dossiers médicaux des centres de FIV pour tous les couples. L’information sur le devenir des couples après le départ du centre a été obtenue par questionnaire postal auprès des couples en 2008-2009 (38% de participation 7 à 9 ans après l’initiation des FIV). L’étude des facteurs associés à la participation à l’enquête postale suggérait que la fréquence de réalisation du projet parental estimée sur les répondants seulement pourrait être biaisée. Les différentes méthodes mises en œuvre pour corriger la non réponse (pondération, imputation multiple) n’ont pas modifié l’estimation de la fréquence de réalisation du projet parental. Au total, 7 à 9 ans après l’initiation des FIV, 60% des couples ont réalisé leur projet parental de façon biologique, suite à un traitement ou suite à une conception naturelle. Lorsque les adoptions sont aussi prises en compte, 71% des couples ont réalisé leur projet parental. Après l’échec d’une première tentative de FIV, un couple sur 4 (26%) a interrompu les FIV dans le centre d’inclusion. Globalement, les couples avec de mauvais facteurs pronostiques ont un plus grand risque d’interrompre les FIV. Cependant, la proportion plus importante d’interruption parmi les couples avec une origine inexpliquée de l’infécondité pourrait s’expliquer par la survenue plus fréquente de naissance naturelle dans ce sous-groupe de couples. Parmi les couples n’ayant pas eu d’enfant suite aux traitements, 24% ont ensuite conçu naturellement en médiane 28 mois après l’initiation des FIV. Parmi les couples ayant eu un enfant suite aux traitements, 17% ont ensuite conçu naturellement en médiane 33 mois après la naissance de l’enfant conçu par AMP. Les facteurs associés aux naissances naturelles sont des indicateurs d’un meilleur pronostic de fertilité, particulièrement chez les couples sans enfant AMP.L’enquête DAIFI-2009 a permis d’apporter des informations sur le parcours à long terme des couples traités par FIV qui n’avait jusqu’à présent été que peu étudié, souvent sur de faibles effectifs et avec un suivi plus court. Ces résultats doivent apporter de l’espoir aux couples inféconds, puisque la majorité d’entre eux ont finalement réalisé leur projet parental, même si cela peut prendre de nombreuses années. / Until now, most studies of couples treated by in vitro fertilization (IVF) have been centered on IVF success. Very few data are available on the long-term outcome of these couples, including spontaneous conception and adoptions. This work aimed to estimate the long-term cumulative parenthood rate, and to study factors associated with early IVF discontinuation and with spontaneous live births.The DAIFI study is a retrospective cohort including 6,507 couples who began IVF in 2000-2002 in one of the eight participating French IVF centres. Medical data on all couples were obtained from centre databases. Information on long-term outcome after leaving the IVF center was collected by postal questionnaire sent to couples in 2008-2010 (7 to 9 years after IVF initiation, participation rate 38%). Study of factors associated with participation in the postal survey suggested that the cumulative parenthood rate estimated only in participants might be biased. The different methods used to correct for non-response bias (inverse probability weighting, multiple imputation) did not modify the estimation of the cumulative parenthood rate obtained with the complete case approach. Finally, 7 to 9 years after IVF initiation, the cumulative parenthood rate was estimated at 60%, including live births following IVF, other treatment or spontaneous conception. When adoptions were also considered, the cumulative parenthood rate reached 71%. After a first failed IVF cycle, just over one couple out of four (26%) discontinued IVF treatment. Globally, couples with poor prognostic factors had a higher risk of early discontinuation of IVF treatment. However, the higher proportion of early discontinuation observed among couples with unexplained infertility could be linked to a higher chance of spontaneous pregnancy in this subpopulation. Among couples who remained childless after treatment, 24% later had a spontaneous live birth (SLB), at a median of 28 months after the first IVF attempt. Among couples who had had a child during medical treatment, 17% later had an SLB, at a median of 33 months after the birth following medical treatment. Regarding factors associated with SLB, they can be viewed as indicators of a better fertility prognosis, especially among unsuccessfully treated couples.The DAIFI study has provided information on the long-term outcome of couples treated by IVF, which has until now been little studied, often on small samples and with a shorter duration of follow-up. These results should give hope to infertile couples as nearly three couples out of four finally became parents, even if it may take many years.

Objetivo: Avaliar o impacto do nascimento pré-termo sobre a mortalidade neonatal numa série temporal de 2000 a 2014 no município de Porto Alegre. Métodos: Estudo de coorte retrospectivo de base populacional com a utilização dos registros oficiais de nascimento e de morte ligados de 2000 a 2014 de recém-nascidos com menos de 32 semanas de idade gestacional de Porto Alegre. Foram utilizadas como variáveis independentes idade e escolaridade maternas, número de consultas pré-natal, tipo de hospital, via de parto, idade gestacional (IG), sexo e peso do recém-nascido e ano de nascimento. O desfecho primário foi morte neonatal (morte ocorrida de 0 a 27 dias de vida). Foram excluídos recém-nascidos duplicados, com menos de 500 gramas ou com peso inconsistente, com IG menor de 22 semanas, com anomalias congênitas, gemelares e de partos extra hospitalares. Foi calculado razão de risco (hazard ratio-HR) ajustado para o risco de morte neonatal para todas as variáveis independentes através de análise de sobrevivência pela regressão de Cox para riscos proporcionais com nível de significância p<0,05. Posteriormente, foi realizado análise por quintil de peso de nascimento. Resultados: Foram analisados os registros de 3282 recém-nascidos com IG menor que 32 semanas de 2000 a 2014 dos quais, 643 foram ao óbito neonatal e 2639 sobreviveram. O risco de morte neonatal absoluto diminuiu de 25% no triênio 2000 a 2002 para 17% no período de 2012 a 2014. O mesmo risco ajustado foi significativamente menor para os recém-nascidos de menor peso (média de 673 ± 86 gramas) de parto cesáreo [HR 0,57 (IC95% 0,45-0,73)] enquanto que, para os de maior peso (média 1.834 ± 212 gramas) este risco inverteu-se e foi significativamente maior para esta via de parto [HR 8,44 (IC95% 1,86-38,22)]. Conclusão: Houve diminuição do risco absoluto de morte neonatal entre os recém-nascidos com IG menor de 32 semanas nos últimos anos em Porto Alegre e o aprimoramento do uso racional do parto cesáreo nos hospitais do município pode contribuir para uma redução ainda maior desse indicador. / Objective: Assess impact of prematurity on neonatal mortality from 2000 to 2014 in Porto Alegre through official information systems. Methods: Populational base retrospective cohort study with record linkage of birth and death database certificates. There were included records of birth and death from 2000 to 2014 of infants with less than 32 weeks of gestational age of Porto Alegre. There were used mother age and schooling, number of antenatal visits, delivery type, hospital type, gestational age, sex and birth weight and birth year of infant as independent variables. The primary outcome examined was neonatal death (death at 0-27 days of age). There were excluded infant records duplicate, with less than 500g or inconsistent birthweight, with gestational age less than 22 weeks, with congenital anomalies, twins and out-of-hospital births. Adjusted Hazard Ratio (HR) were calculated for the risk of neonatal death for all independent variables through Cox regression for survival analysis with p-value<0,05 for statistical significance. The analysis also was performed at quintiles of birthweight. Results: There were 3282 infant records of infants with less than 32 weeks of gestational age from 2000 to 2014 who progress to 643 neonatal deaths or 2639 survival. The neonatal death absolut risk decline from 25% at 2000-2002 period to 17% at 2012-2014 period. The adjusted neonatal death risk was significantly reduced for lightest preterm (mean birthweight 673g ± 86) born by C-section [HR 0.57 (CI95% 0.45-0.73)], while, for the heaviest ones (mean birthweight 1.834g ± 212) the risk was significantly increased for that delivery route [HR 8.44 (CI95% 1.86-38.22)]. Conclusion: The absolut risk of neonatal death in infants with less than 32 weeks of gestational age has been declining over the years and more rational use of C-section can contribute to further improving the neonatal survival.

Objetivo: Avaliar o impacto do nascimento pré-termo sobre a mortalidade neonatal numa série temporal de 2000 a 2014 no município de Porto Alegre. Métodos: Estudo de coorte retrospectivo de base populacional com a utilização dos registros oficiais de nascimento e de morte ligados de 2000 a 2014 de recém-nascidos com menos de 32 semanas de idade gestacional de Porto Alegre. Foram utilizadas como variáveis independentes idade e escolaridade maternas, número de consultas pré-natal, tipo de hospital, via de parto, idade gestacional (IG), sexo e peso do recém-nascido e ano de nascimento. O desfecho primário foi morte neonatal (morte ocorrida de 0 a 27 dias de vida). Foram excluídos recém-nascidos duplicados, com menos de 500 gramas ou com peso inconsistente, com IG menor de 22 semanas, com anomalias congênitas, gemelares e de partos extra hospitalares. Foi calculado razão de risco (hazard ratio-HR) ajustado para o risco de morte neonatal para todas as variáveis independentes através de análise de sobrevivência pela regressão de Cox para riscos proporcionais com nível de significância p<0,05. Posteriormente, foi realizado análise por quintil de peso de nascimento. Resultados: Foram analisados os registros de 3282 recém-nascidos com IG menor que 32 semanas de 2000 a 2014 dos quais, 643 foram ao óbito neonatal e 2639 sobreviveram. O risco de morte neonatal absoluto diminuiu de 25% no triênio 2000 a 2002 para 17% no período de 2012 a 2014. O mesmo risco ajustado foi significativamente menor para os recém-nascidos de menor peso (média de 673 ± 86 gramas) de parto cesáreo [HR 0,57 (IC95% 0,45-0,73)] enquanto que, para os de maior peso (média 1.834 ± 212 gramas) este risco inverteu-se e foi significativamente maior para esta via de parto [HR 8,44 (IC95% 1,86-38,22)]. Conclusão: Houve diminuição do risco absoluto de morte neonatal entre os recém-nascidos com IG menor de 32 semanas nos últimos anos em Porto Alegre e o aprimoramento do uso racional do parto cesáreo nos hospitais do município pode contribuir para uma redução ainda maior desse indicador. / Objective: Assess impact of prematurity on neonatal mortality from 2000 to 2014 in Porto Alegre through official information systems. Methods: Populational base retrospective cohort study with record linkage of birth and death database certificates. There were included records of birth and death from 2000 to 2014 of infants with less than 32 weeks of gestational age of Porto Alegre. There were used mother age and schooling, number of antenatal visits, delivery type, hospital type, gestational age, sex and birth weight and birth year of infant as independent variables. The primary outcome examined was neonatal death (death at 0-27 days of age). There were excluded infant records duplicate, with less than 500g or inconsistent birthweight, with gestational age less than 22 weeks, with congenital anomalies, twins and out-of-hospital births. Adjusted Hazard Ratio (HR) were calculated for the risk of neonatal death for all independent variables through Cox regression for survival analysis with p-value<0,05 for statistical significance. The analysis also was performed at quintiles of birthweight. Results: There were 3282 infant records of infants with less than 32 weeks of gestational age from 2000 to 2014 who progress to 643 neonatal deaths or 2639 survival. The neonatal death absolut risk decline from 25% at 2000-2002 period to 17% at 2012-2014 period. The adjusted neonatal death risk was significantly reduced for lightest preterm (mean birthweight 673g ± 86) born by C-section [HR 0.57 (CI95% 0.45-0.73)], while, for the heaviest ones (mean birthweight 1.834g ± 212) the risk was significantly increased for that delivery route [HR 8.44 (CI95% 1.86-38.22)]. Conclusion: The absolut risk of neonatal death in infants with less than 32 weeks of gestational age has been declining over the years and more rational use of C-section can contribute to further improving the neonatal survival.

Objetivo: Avaliar o impacto do nascimento pré-termo sobre a mortalidade neonatal numa série temporal de 2000 a 2014 no município de Porto Alegre. Métodos: Estudo de coorte retrospectivo de base populacional com a utilização dos registros oficiais de nascimento e de morte ligados de 2000 a 2014 de recém-nascidos com menos de 32 semanas de idade gestacional de Porto Alegre. Foram utilizadas como variáveis independentes idade e escolaridade maternas, número de consultas pré-natal, tipo de hospital, via de parto, idade gestacional (IG), sexo e peso do recém-nascido e ano de nascimento. O desfecho primário foi morte neonatal (morte ocorrida de 0 a 27 dias de vida). Foram excluídos recém-nascidos duplicados, com menos de 500 gramas ou com peso inconsistente, com IG menor de 22 semanas, com anomalias congênitas, gemelares e de partos extra hospitalares. Foi calculado razão de risco (hazard ratio-HR) ajustado para o risco de morte neonatal para todas as variáveis independentes através de análise de sobrevivência pela regressão de Cox para riscos proporcionais com nível de significância p<0,05. Posteriormente, foi realizado análise por quintil de peso de nascimento. Resultados: Foram analisados os registros de 3282 recém-nascidos com IG menor que 32 semanas de 2000 a 2014 dos quais, 643 foram ao óbito neonatal e 2639 sobreviveram. O risco de morte neonatal absoluto diminuiu de 25% no triênio 2000 a 2002 para 17% no período de 2012 a 2014. O mesmo risco ajustado foi significativamente menor para os recém-nascidos de menor peso (média de 673 ± 86 gramas) de parto cesáreo [HR 0,57 (IC95% 0,45-0,73)] enquanto que, para os de maior peso (média 1.834 ± 212 gramas) este risco inverteu-se e foi significativamente maior para esta via de parto [HR 8,44 (IC95% 1,86-38,22)]. Conclusão: Houve diminuição do risco absoluto de morte neonatal entre os recém-nascidos com IG menor de 32 semanas nos últimos anos em Porto Alegre e o aprimoramento do uso racional do parto cesáreo nos hospitais do município pode contribuir para uma redução ainda maior desse indicador. / Objective: Assess impact of prematurity on neonatal mortality from 2000 to 2014 in Porto Alegre through official information systems. Methods: Populational base retrospective cohort study with record linkage of birth and death database certificates. There were included records of birth and death from 2000 to 2014 of infants with less than 32 weeks of gestational age of Porto Alegre. There were used mother age and schooling, number of antenatal visits, delivery type, hospital type, gestational age, sex and birth weight and birth year of infant as independent variables. The primary outcome examined was neonatal death (death at 0-27 days of age). There were excluded infant records duplicate, with less than 500g or inconsistent birthweight, with gestational age less than 22 weeks, with congenital anomalies, twins and out-of-hospital births. Adjusted Hazard Ratio (HR) were calculated for the risk of neonatal death for all independent variables through Cox regression for survival analysis with p-value<0,05 for statistical significance. The analysis also was performed at quintiles of birthweight. Results: There were 3282 infant records of infants with less than 32 weeks of gestational age from 2000 to 2014 who progress to 643 neonatal deaths or 2639 survival. The neonatal death absolut risk decline from 25% at 2000-2002 period to 17% at 2012-2014 period. The adjusted neonatal death risk was significantly reduced for lightest preterm (mean birthweight 673g ± 86) born by C-section [HR 0.57 (CI95% 0.45-0.73)], while, for the heaviest ones (mean birthweight 1.834g ± 212) the risk was significantly increased for that delivery route [HR 8.44 (CI95% 1.86-38.22)]. Conclusion: The absolut risk of neonatal death in infants with less than 32 weeks of gestational age has been declining over the years and more rational use of C-section can contribute to further improving the neonatal survival.

京都大学 / 新制・課程博士 / 博士(医学) / 甲第25159号 / 医博第5045号 / 新制||医||1070(附属図書館) / 京都大学大学院医学研究科医学専攻 / (主査)教授 中山 健夫, 教授 森田 智視, 教授 永井 洋士 / 学位規則第4条第1項該当 / Doctor of Agricultural Science / Kyoto University / DFAM