Publications by authors named "Derksen S"

Background: In Bayesian models including predictive processing, the magnitude and precision of pain expectancies are key determinants of perception. However, relatively few studies have directly tested whether this holds for pain, and results so far have been inconclusive. Here, we investigated expectancy effects on pain experiences and associated affective responses.

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  • The study examines the use of antiseizure medications (ASMs) among pregnant individuals in four Canadian provinces over 20 years, focusing on trends and patterns in ASM usage among those with and without epilepsy.
  • Results showed that only 0.7% of the pregnant population had epilepsy, with 1.7% exposed to ASMs; notable increases in ASM use were observed among those without epilepsy, especially in Manitoba, Saskatchewan, and Alberta.
  • The analysis also revealed shifts in ASM drug classes, with a decline in older medications like carbamazepine and a rise in newer options like lamotrigine, while usage patterns varied by province and trimester.
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Mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene result in cystic fibrosis, a multiorgan disease characterized by aberrant epithelial cell fluid secretion. Recent studies describe a connection between CFTR malfunctioning and a heightened susceptibility to colorectal cancer (CRC). Here, we outline these links and suggest directions for further studies.

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  • The study assessed breastfeeding initiation rates among women with epilepsy (WWE) compared to women without epilepsy (WWoE) in Manitoba, finding a 10% lower breastfeeding initiation rate in WWE (70.9%) vs. WWoE (81.8%).
  • Key factors influencing breastfeeding in WWE included cesarean delivery, chronic pain, lower income, and gestational age, while WWoE also faced challenges from chronic pain, lower income, and mood disorders.
  • The research concluded that WWE have significant barriers to breastfeeding, highlighting the need for targeted support and counseling, with recommendations for further investigation into breastfeeding practices post-initiation.
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Negative expectations can increase pain sensitivity, leading to nocebo hyperalgesia. However, the physiological and psychological factors that predispose individuals to this phenomenon are still not well understood. The present study examined whether stress induced by a social stressor affects nocebo hyperalgesia, and whether this effect is mediated by self-reported and physiological stress responses.

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Background: Cancer is a leading cause of death among adults living with intellectual or developmental disabilities (IDD). However, few epidemiological studies exist worldwide quantifying inequalities in cancer stage at diagnosis and survival for people with IDD relative to those without IDD.

Methods: A population-based, retrospective cohort study was conducted using provincial health and social administrative data in Manitoba, Canada.

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Background: Cancer is a leading cause of death among people living with intellectual or developmental disabilities (IDD). Although studies have documented lower cancer screening rates, there is limited epidemiological evidence quantifying potential diagnostic delays. This study explores the risk of metastatic cancer stage for people with IDD compared to those without IDD among breast (female), colorectal, and lung cancer patients in Canada.

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Objective: Uncertainty is unavoidable in the context of painful medical procedures. It is important to investigate the impact of different ways of communicating uncertainty on upcoming pain.

Methods: In our exploratory study, healthy participants (n = 30) were repeatedly presented with three highly uncertain pain predictions communicated by a hypothetical doctor.

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Objective: The objective of this study was to investigate whether placebo effect induced by pharmacological conditioning with intranasal insulin can affect glucose, insulin, C-peptide, hunger, and memory in patients with diabetes type 2 and healthy controls.

Methods: Placebo effect was induced by pharmacological conditioning. Thirty-two older patients (mean age = 68.

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Introduction: With a rapidly aging population, age-neutrality of psychological instruments is becoming ever more important for accurate assessment of older adults. This study aims to test the age-neutrality of the Dutch Behavioral Inhibition System/Behavioral Approach System (BIS/BAS) scales by means of Differential Item Functioning (DIF) and Differential Test Functioning (DTF) analyses.

Methods: DIF and DTF analyses were conducted using an odds ratio approach.

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RNA is a vital biomolecule, the function of which is tightly spatiotemporally regulated. RNA organelles are biological structures that either membrane-less or surrounded by membrane. They are produced by the all the cells and indulge in vital cellular mechanisms.

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Objective: To evaluate the effects of early pregnancy loss on subsequent health care use and costs.

Data Sources: Linked administrative health databases from Manitoba, Canada.

Study Design: This was a population-based cohort study.

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Background: Pregnancy loss is common and several factors (e.g. chromosomal anomalies, parental age) are known to increase the risk of occurrence.

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Bacteria from the genera and can promote the growth of , but the underlying mechanisms are not yet known. In a pot experiment, sorghum plants grown on sterilized substrate were inoculated with strain IAC/BECa 135 and strain IAC/BECa 152 under phosphate-deficient conditions. These strains significantly increased cultivar SRN-39 root and shoot biomass.

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Objectives: To determine if in utero selective serotonin reuptake inhibitor (SSRI) or selective serotonin norepinephrine inhibitor (SNRI) exposure is associated with developmental vulnerability in kindergarten among children whose mothers were diagnosed with prenatal mood or anxiety disorder.

Methods: Linkable administrative data were used to create a population-based cohort of 266 479 mother-child dyads of children born in Manitoba, Canada, between 1996 and 2014, with follow-up through 2015. The sample was restricted to mothers who had a mood or anxiety disorder diagnosis between 90 days before conception ( = 13 818).

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Objective: In the province of Manitoba, Canada, given that latent tuberculosis infection (LTBI) treatment is provided at no cost to the patient, treatment completion rates should be optimal. The objective of this study was to estimate LTBI treatment completion using prescription drug administrative data and identify patient characteristics associated with completion.

Methods: Prescription drug data (1999-2014) were used to identify individuals dispensed isoniazid (INH) or rifampin (RIF) monotherapy.

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Objective: Little is known about how prenatal care influences health outcomes in Canada. The objective of this study was to examine the association of prenatal care utilization with maternal, fetal, and infant outcomes in Manitoba.

Methods: This retrospective cohort study conducted at the Manitoba Centre for Health Policy investigated all deliveries of singleton births from 2004-2005 to 2008-2009 (N = 67 076).

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Background: Ensuring high quality and equitable maternity services is important to promote positive pregnancy outcomes. Despite a universal health care system, previous research shows neighborhood-level inequities in utilization of prenatal care in Manitoba, Canada. The purpose of this population-based retrospective cohort study was to describe prenatal care utilization among women giving birth in Manitoba, and to determine individual-level factors associated with inadequate prenatal care.

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Study Objective: This study compares how throughput and output factors affect emergency department (ED) median waiting room time.

Methods: Administrative health care use records were used to identify all daytime (8 am to 8 pm) visits made to adult EDs in Winnipeg, Canada, between April 1, 2012, and March 31, 2013. First, we measured the waiting room time (from patient registration until transfer into the ED) of each index visit (incoming patient).

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Background: Scientists have called for strategies to identify ED patients with unmet needs. We identify the unique profile of ED patients who arrive by ambulance and subsequently leave without consulting a provider (ie, a paradoxical visit, PV).

Methods: Using a retrospective cohort design, administrative data from Winnipeg, Manitoba were interrogated to identify all ED patients 17+ years old as having zero, single or multiple PVs in 2012/2013.

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Laboratory rats have been widely used to study the development and neural underpinnings of play behavior. However, it is not known whether domestic rats play in the same way and at the same frequency as their wild counterparts. In this study, the play of juvenile rats from a colony of wild rats maintained in captivity was compared to that of a strain of domesticated rats (e.

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Study Objective: We identify factors that define frequent and highly frequent emergency department (ED) users.

Methods: Administrative health care records were used to define less frequent (1 to 6 visits), frequent (7 to 17 visits), and highly frequent (≥18 visits) ED users. Analyses were conducted to determine the most unique demographic, disease, and health care use features of these groups.

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Introduction: Changing socio-economic gradients in adult health over time have been documented, but little research has investigated temporal changes in child health gradients. Childhood hospitalizations for injury have fallen over the last two decades; whether the socio-economic gradient in childhood injury has changed is unknown.

Methods: Population-based hospital discharge data were used to calculate rates of hospitalization for injury from 1986/87 through 2005/06 for all children under 20 years of age in Manitoba (average yearly number of hospitalizations = 326,357).

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The naturally occurring acylated phloroglucinol derivative hyperforin was recently identified as the first specific canonical transient receptor potential-6 (TRPC6) activator. Hyperforin is the major antidepressant component of St. John's wort, which mediates its antidepressant-like properties via TRPC6 channel activation.

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