Life-Course Perspective A Primer for MCH Epidemiologist Michael C. Lu, MD, MPH Associate Professor Department of Obstetrics & Gynecology David Geffen School.

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Presentation transcript:

Life-Course Perspective A Primer for MCH Epidemiologist Michael C. Lu, MD, MPH Associate Professor Department of Obstetrics & Gynecology David Geffen School of Medicine at UCLA Department of Community Health Sciences UCLA School of Public Health MCH Epidemiology Conference Atlanta, GA December 13, 2007

Life-Course Perspective  A way of looking at life not as disconnected stages, but as an integrated continuum

Life Course Perspective Lu MC, Halfon N. Racial and ethnic disparities in birth outcomes: a life-course perspective. Matern Child Health J. 2003;7:13-30.

Life Course Perspective  Early programming  Cumulative pathways

Early Programming

Barker Hypothesis Birth Weight and Coronary Heart Disease Age Adjusted Relative Risk Rich-Edwards JW, Stampfer MJ, Manson JE, Rosner B, Hankinson SE, Colditz GA et al. Birth weight and risk of cardiovascular disease in a cohort of women followed up since Br Med Jr 1997;315:

Barker Hypothesis Birth Weight and Hypertension Law CM, de Swiet M, Osmond C, Fayers PM, Barker DJP, Cruddas AM, et al. Initiation of hypertension in utero and its amplification throughout life. Br Med J 1993;306:24-27.

Barker Hypothesis Birth Weight and Insulin Resistance Syndrome Odds ratio adjusted for BMI Barker DJP, Hales CN, Fall CHD, Osmond C, Phipps K, Clark PMS. Type 2 (non-insulin-dependent) diabetes mellitus, hypertension and hyperlipidaemia (Syndrome X): Relation to reduced fetal growth. Diabetologia 1993;36:62-67.

Prenatal Programming of Childhood Obesity

Epidemic of Childhood Overweight & Obesity Source: National Center for Health Statistics, National Health and Nutrition Examination Survey Note: Estimate not available for for Hispanic; overweight defined as BMI at or above the 95 th percentile ofr the CDC BMI-for-age growth charts Children 6-18 Overweight

Prenatal Programming of Childhood Overweight & Obesity

Maternal Diabetes & Intrauterine Hyperglycemia Intrauterine Hyperinsulinemia (Fetal Pancreatic β Cells) Prenatal& Postnatal Hyperleptinemia Preadipocyte Differentiation Adipocyte Hyperplasia Hypothalamic Leptin Resistance Pancreatic β- Cell Leptin Resistance Hyperphagia Hyperinsulinism Programmed Insulin Resistance Postnatal Hyperinsulinemia Maternal Diabetes & Intrauterine Hyperglycemia Intrauterine Hyperinsulinemia (Fetal Pancreatic β Cells) Prenatal& Postnatal Hyperleptinemia Adipocyte Hyperplasia Hypothalamic Leptin Resistance Pancreatic β- Cell Leptin Resistance Hyperphagia Hyperinsulinism Programmed Insulin Resistance Postnatal Hyperinsulinemia Adipogenesis Dysregulation of the Adipoinsular Feedback System Maternal Diabetes & Intrauterine Hyperglycemia Intrauterine Hyperinsulinemia (Fetal Pancreatic β Cells) Prenatal& Postnatal Hyperleptinemia Preadipocyte Differentiation Adipocyte Hyperplasia Hypothalamic Leptin Resistance Pancreatic β- Cell Leptin Resistance Hyperphagia Hyperinsulinism Programmed Insulin Resistance Postnatal Hyperinsulinemia Adipogenesis Maternal Diabetes & Intrauterine Hyperglycemia Intrauterine Hyperinsulinemia (Fetal Pancreatic β Cells) Prenatal& Postnatal Hyperleptinemia Preadipocyte Differentiation Adipocyte Hyperplasia Hypothalamic Leptin Resistance Pancreatic β - Cell Leptin Resistance Hyperphagia Hyperinsulinism Programmed Insulin Resistance Postnatal Hyperinsulinemia Adipogenesis Prenatal Programming of Childhood Obesity

Cumulative Pathways

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Allostasis: Maintain Stability through Change McEwen BS. Protective and damaging effects of stress mediators. N Eng J Med. 1998;338:171-9.

Allostastic Load: Wear and Tear from Chronic Stress McEwen BS. Protective and damaging effects of stress mediators. N Eng J Med. 1998;338:171-9.

Stressed vs. Stressed Out  Stressed Increased cardiac output Increased available glucose Enhanced immune functions Growth of neurons in hippocampus & prefrontal cortex  Stressed Out Hypertension & cardiovascular diseases Glucose intolerance & insulin resistance Infection & inflammation Atrophy & death of neurons in hippocampus & prefrontal cortex

Allostasis & Allostatic Load McEwen BS, Lasley EN. The end of stress: As we know it. Washington DC: John Henry Press. 2002

Rethinking Preterm Birth

Vulnerability to preterm delivery may be traced to not only exposure to stress & infection during pregnancy, but host response to stress & infection (e.g. stress reactivity & inflammatory dysregulation) patterned over the life course (early programming & cumulative allostatic load)

Preterm Birth & Maternal Ischemic Heart Disease Kaplan-Meier plots of cumulative probability of survival without admission or death from ischemic heart disease after first pregnancy in relation to preterm birth Smith et al Lancet 2001;357:

Life Course Perspective Implications for MCH Epidemiology  Research What are life-course influences on perinatal outcomes What are perinatal influences on life-course outcomes  Practice What are data systems needs for MCH life-course epidemiology in Health Departments?  Policy What is the return on investment over the life course? (For every dollar spent on prenatal care (or preconception care), X dollars are saved on (childhood obesity, early-onset Type II diabetes, autism, learning disabilities, asthma ….)