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Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
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Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
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Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
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Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Preclinical development consists of a series of tests that ensure the safety and efficacy of a new therapeutic compound before it is tested in humans. There are four main phases to this process. First, safety pharmacology tests are conducted to ensure the drug does not produce any acutely harmful effects. These tests examine parameters such as bronchoconstriction, cardiac dysrhythmias, blood pressure changes, and ataxia. Next, preliminary toxicological testing is performed to determine the...
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Cohort profile update: The Canadian Maternal-Infant Research on Environmental Chemicals Child Development study

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Summary

The Maternal-Infant Research on Environmental Chemicals (MIREC) study investigated prenatal chemical exposures and child development. Follow-up research (MIREC-CD PLUS) assessed early childhood anthropometry and neurodevelopment, with ongoing adolescent endocrine and metabolic function studies.

Keywords:
cohort studyenvironmental chemicalsneurodevelopmenttoddler

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Area of Science:

  • Environmental Health Sciences
  • Pediatric Epidemiology
  • Developmental Toxicology

Background:

  • The pan-Canadian Maternal-Infant Research on Environmental Chemicals (MIREC) study initially focused on maternal environmental chemical exposures and adverse pregnancy outcomes.
  • The MIREC study enrolled 2001 pregnant women to assess links between chemical exposures and pregnancy health.

Purpose of the Study:

  • The MIREC-Child Development (CD PLUS) study aimed to evaluate the effects of prenatal chemical exposures on children's anthropometry and neurodevelopment in early childhood.
  • This research extends the MIREC cohort to investigate long-term impacts into adolescence, specifically focusing on endocrine and metabolic function (MIREC-ENDO).

Main Methods:

  • The MIREC-CD PLUS study invited 1459 families from the original MIREC cohort with children aged 15 months to 5 years.
  • Data collection involved an online Maternal Self-Administered Questionnaire, biomonitoring (blood and urine samples), and neurodevelopmental assessments during two in-person visits.
  • Neurodevelopmental assessments included standardized tests such as the Behavior Rating Inventory of Executive Function and the Wechsler Preschool Primary Scale of Intelligence-III.

Main Results:

  • Between April 2013 and March 2015, 803 children underwent biomonitoring, with anthropometric measures, blood, and urine collected.
  • Neurodevelopmental data, including cognitive, behavioral, and communication assessments, were obtained for nearly 900 children.
  • Neuropsychological assessments were completed for 610 singleton children, with ongoing follow-up into early adolescence for endocrine and metabolic function.

Conclusions:

  • Data collection for MIREC-CD PLUS is complete, and ongoing analysis continues to explore associations between early life exposures and child development.
  • The study acknowledges limitations including participant attrition and a predominantly higher socioeconomic status and White ethnicity cohort, impacting generalizability.
  • Despite limitations, the MIREC study's comprehensive biomonitoring and clinical data provide a valuable platform for examining the impact of environmental exposures on child growth and development.