1 TRAINING FOR HEALTH CARE PROVIDERS [Date …Place …Event…Sponsor…Organizer] CHILDHOOD RESPIRATORY DISEASES LINKED TO THE ENVIRONMENT Children's Health and the Environment WHO Training Package for the Health Sector World Health Organization

Childhood Respiratory Diseases & the Environment 2 LEARNING OBJECTIVES  To understand how the respiratory tract is affected by the environment  To describe respiratory diseases linked to the environment  To list one population-level intervention and one personal-level intervention for decreasing risk of respiratory diseases

Childhood Respiratory Diseases & the Environment 3 ADVERSE HEALTH EFFECTS Deaths Hospitalizations Visits to Clinic Symptoms Annoyance, Discomfort

Childhood Respiratory Diseases & the Environment 4 ADVERSE RESPIRATORY EFFECTS  Upper respiratory infection  Otitis media with effusion  Tuberculosis  Acute pulmonary haemorrhage  Pneumonia  Bronchiectasis  Sudden infant death syndrome  Changes in lung function  Asthma / bronchospasm / allergies

Childhood Respiratory Diseases & the Environment 5 World Health Report, 2002,

Childhood Respiratory Diseases & the Environment 6 Despite extraordinary advances in the 20th century, 2000: 10.9 million deaths in children under 5 years (Murray, The Global Burden of Disease 2000 Project, WHO, 2001) 1990: 12.7 million Black, Lancet (2003) 361: Causes & estimated number of deaths/yr in children yrs Acute respiratory infections: Diarrhoeal diseases: Malaria & other vector-borne: In older children (0-14 y.o.) Injuries (non-intentional) Poisonings World Health Report, 2001, LEADING CAUSE OF DEATH IN CHILDREN

Childhood Respiratory Diseases & the Environment 7 CHALLENGES TO CHILDREN’S HEALTH & DEVELOPMENT: CHALLENGES TO CHILDREN’S HEALTH & DEVELOPMENT: The Double - or Triple - Burden of Disease EMERGING EPIDEMICS OF NON-COMMUNICABLE DISEASES “NEW” THREATS Asthma, Injuries, Traffic effects, Neurodevelopmental, learning & behavioural disorders Cancer Endocrine disruption PERSISTENT PROBLEMS “THE UNFINISHED AGENDA” Infectious diseases in low income countries: ARI Malaria Measles Diarrhoea HIV/AIDS... WHO

Childhood Respiratory Diseases & the Environment 8 HOW CHILDREN ARE DIFFERENT Short stature Breathe closer to the ground Increased air intake Ongoing lung development WHO

Childhood Respiratory Diseases & the Environment 9 CHILDREN’S UNIQUE VULNERABILITY  Higher exposures because they spend more time outside  Inhale more pollutants per kilogram of body weight than do adults  Because airways are narrower, irritation can result in proportionately greater airway obstruction

Childhood Respiratory Diseases & the Environment 10 Rapid growth & development of the lungs Newborn: 10,000,000 alveoli 8 year old: 300,000,000 alveoli Growth of alveoli and capillaries continues up to 8 years of age Exposure to second-hand tobacco smoke slows the rate of growth “Dirty air stunts growth” Study of 3000 children since 1993 showed impaired lung growth…which may be linked to asthma and emphysema in adults Gauderman, (2000) Air pollution has chronic, adverse effects on lung development in children Gauderman (2004) SPECIAL VULNERABILITY OF CHILDREN WHO

Childhood Respiratory Diseases & the Environment 11 SMALLER AIRWAYS MORE VULNERABLE

Childhood Respiratory Diseases & the Environment 12 DEPOSITION OF POLLUTANTS IN RESPIRATORY TRACT CDC

Childhood Respiratory Diseases & the Environment 13 PARTICLE SIZE AND DEPOSITION

Childhood Respiratory Diseases & the Environment 14 UPPER RESPIRATORY ILLNESS CDC  “Colds” and irritation of the respiratory tract  Can decrease quality of life for children  Strong links with middle ear diseases

Childhood Respiratory Diseases & the Environment 15 OTITIS MEDIA WITH EFFUSION  Major problem for children under 5 years  Strong link with smoking in the home  Prolonged duration of middle ear effusions  Synergy between viral infection and particulate exposures

Childhood Respiratory Diseases & the Environment 16 TUBERCULOSIS  Passive or active exposure to tobacco smoke is significantly associated with tuberculous infection and tuberculosis disease.  Active smoking is significantly associated with recurrent tuberculosis and tuberculosis mortality. These effects appear to be independent of the effects of alcohol use, socioeconomic status and a large number of other potential confounders.

Childhood Respiratory Diseases & the Environment 17 ACUTE PULMONARY HAEMORRHAGE  Emerging data show an association with indoor exposure to mouldy home environments  Mycotoxins on surface of spores may lead to capillary fragility  Additional research ongoing Courtesy: R. Etzel

Childhood Respiratory Diseases & the Environment 18 PNEUMONIA  Leading cause of illness and death worldwide in children under five years  Synergy between bacterial and viral pneumonia and air pollution  Importance of zinc Preventing pneumonia Accelerating recovery from severe pneumonia

Childhood Respiratory Diseases & the Environment 19 BRONCHIECTASIS Causes:  Severe pneumonia  Tuberculosis  HIV  Chronic sinusutis  Aspergillosis  Fungal infections  Foreign body aspiration  Arsenic exposure (foetal and early childhood)

Childhood Respiratory Diseases & the Environment 20 SUDDEN INFANT DEATH SYNDROME  The sudden death of an infant under 1 year of age that remains unexplained even after a thorough investigation including a complete history, full autopsy, and visit to the home  Linked to prenatal smoking, postnatal smoking in the home, infant positioning, ambient air pollution (particulates)

Childhood Respiratory Diseases & the Environment 21 ASTHMA  Intermittent reversible airway obstruction  Chronic airway inflammation  Hyper-responsiveness to stimuli  Most common chronic disease of childhood

Childhood Respiratory Diseases & the Environment 22 Between 1980 and 1995, the prevalence of asthma increased 77% overall and 82% among children 5 to 14 years of age yrs All ages Rate per 1000 population Centers for Disease Control and Prevention, MMWR, (1):1 EXAMPLE: ASTHMA IN UNITED STATES

Childhood Respiratory Diseases & the Environment 23 ASTHMA IN CHILDREN, USA  Affects 5 million people under 18 years of age  Low-income populations, minorities, and children in inner cities have a higher morbidity and mortality rate  Accounts for 10 million lost days of school annually  3rd cause of hospitalization among those under 15 years  Estimated cost of asthma treatment in the under 18: US $ 3.2 billion per year

Childhood Respiratory Diseases & the Environment 24 ALLERGIES ON THE RISE  Allergies are on the rise and considered a modern epidemic  Reactions to common substances represent new risks

Childhood Respiratory Diseases & the Environment 25 FAMILY HISTORY OF ASTHMA  Does anyone in the family have asthma or reactive airways disease?  Does anyone tin the family use an inhaler when he gets a cold or before exercise?  Has anyone in the family had repeated episodes of bronchitis or pneumonia?  Does anyone in the family cough for two or three weeks whenever she/he gets a cold?

Childhood Respiratory Diseases & the Environment 26 WHY IS ASTHMA INCREASING? Factors associated with Westernization, rather than urbanization, probably account for the increases  dietary changes  more use of antibiotics  more use of processed foods - alteration in bowel flora (more Clostridial bacteria, less lactobacillus)

Childhood Respiratory Diseases & the Environment 27 WHAT EXPLAINS THE INCREASE IN ASTHMA PREVALENCE?  No single answer  Outdoor air pollution and indoor air pollution both play a role  Active area of research FIRST YEAR OF LIFE IS CRITICAL  Low dose exposure to allergens leads to increased sensitization  High dose exposure leads to decreased sensitization cat? other pets?

Childhood Respiratory Diseases & the Environment 28 OUTDOOR PRECIPITANTS OF ASTHMA  Ozone (ground level)  Sulfur dioxide  Particulate matter  PAHs  Moulds  Pollens  Burning of waste WHO

Childhood Respiratory Diseases & the Environment 29 OUTDOOR POLLUTANTS AND RESPIRATORY HEALTH

Childhood Respiratory Diseases & the Environment 30 EXPOSURE TO POLYCYCLIC AROMATIC HYDROCARBONS (PAHs)  Some suggestions of link to childhood asthma  May impair immune function of foetus  Increased susceptibility to respiratory infections?

Childhood Respiratory Diseases & the Environment 31 MOULDS  60 species of moulds have spores that are allergenic  30% of patients with respiratory allergies are particularly sensitive to moulds  Odds of death from asthma two times higher on days with outdoor mould spore counts >1000 spores/m 3 EPA

Childhood Respiratory Diseases & the Environment 32 POLLENS  Avoid outside play on high pollen days  Antihistamine use  Penetrate into home  Air conditioning  Air filtration systems: HEPA filter

Childhood Respiratory Diseases & the Environment 33 MAJOR INDOOR PRECIPITANTS OF ASTHMA  Allergens Dust mites Animal allergens Cockroaches Moulds  Irritants Tobacco smoke Perfumes Cleaning agents Nitrogen oxides WHO

Childhood Respiratory Diseases & the Environment 34 DUST MITES  Feed on human dander  Sources Bedding Carpets Upholstery Stuffed toys  Prefer warm, humid environments CDC

Childhood Respiratory Diseases & the Environment 35 ANIMAL ALLERGENS  Cats most allergenic  Birds harbor dust mites  Dogs most common household pet  Allergens persist many months after source removed

Childhood Respiratory Diseases & the Environment 36 COCKROACH ALLERGENS  Important cause of asthma morbidity among children living in inner cities  Increase risk of developing asthma  Also increase risk of asthma attacks CDC

Childhood Respiratory Diseases & the Environment 37 INDUSTRIALIZED COUNTRIES: SWITZERLAND AND RESPIRATORY DISEASE  Air pollution:  Lower prevalence of allergies in rural than in urban environment  Living at high altitude can improve children's asthma  Chronic cough, nocturnal dry cough and bronchitis: associated with PM 10, NO 2 and SO 2  Behaviours  Male, maternal smoking, coffee drinking

Childhood Respiratory Diseases & the Environment 38 The homes of poor children may be unhealthy places deaths ARI in < 5 y.o. Rising trends of “wheezing” Coal and biomass fuel: a major source of indoor air pollution Suspended particulate matter increases the risk of acute respiratory infections CO and other toxic gases may impair development and health Second-hand smoke is a major concern INDOOR AIR POLLUTION IN DEVELOPING COUNTRIES WHO

Childhood Respiratory Diseases & the Environment 39 ENVIRONMENTAL TOBACCO SMOKE  ~700 million (almost half) of the world’s children breathe air polluted by tobacco smoke, particularly at home  Cigarettes consumed, 1998 top 5 Countries China1,643 billion USA 451 billion Japan 328 billion Russia 258 billion Indonesia 215 billion

Childhood Respiratory Diseases & the Environment 40 CHILDREN EXPOSED TO PASSIVE SMOKING AT HOME Cuba69%Ukraine49% Argentina68%Bolivia46% Poland67%Mexico45% Indonesia63%India34% Chile57%Nigeria34% Russian Fed.55%Haiti31% China53%Peru29%

Childhood Respiratory Diseases & the Environment 41 SECOND-HAND SMOKE EXPOSURE  Greatest effect during infancy  Contributes to development of asthma as well as acute exacerbations of asthma  Slows lung growth and development WHO

Childhood Respiratory Diseases & the Environment 42 INTERVENTIONS AND PREVENTION  Population-level  Smoke-free policies  Air Quality Standards  Mass Transportation Initiatives  Indoor Air Regulations for Public Buildings  Smoke Free Schools/Workplaces  Personal-level

Childhood Respiratory Diseases & the Environment 43 SMOKE-FREE POLICIES  Protect children from second-hand smoke  Create non-smoking social norm  Reduce tobacco consumption by 3-4% in high income countries

Childhood Respiratory Diseases & the Environment 44 WHO AIR QUALITY STANDARDS  Ozone100 ug/m 3 8 hours  NO ug/m 3 1 hour  CO30 mg/m 3 1 hour  SO ug/m 3 10 minutes  PM ug/m 3 24 hours  PM ug/m 3 24 hours  Lead0.5 ug/m 3 1 year

Childhood Respiratory Diseases & the Environment 45 POPULATION-LEVEL REDUCING OUTDOOR AIR POLLUTION What interventions have been studied?  Industry closures  Changes in transportation patterns  Replacement of “brown” coal as fuel

Childhood Respiratory Diseases & the Environment 46 POPULATION- LEVEL INDUSTRY CLOSURES When a steel mill in the Utah Valley (US) closed, doctors observed a fall in hospital admissions for respiratory diseases.

Childhood Respiratory Diseases & the Environment 47 POPULATION-LEVEL DECREASE EMISSIONS  IMPROVED HEALTH During 1996 Olympic Games, mass transit was encouraged, areas of Atlanta were closed to private vehicles, telecommuting was encouraged  Declines in ozone pollution occurred  Acute asthma events decreased 42%

Childhood Respiratory Diseases & the Environment 48 POPULATION-LEVEL STUDIES IN EAST AND WEST GERMANY  Since German reunification in 1990, levels of air pollution have declined tremendously in eastern Germany  Closure of numerous industrial plants  Replacement of brown “dirty” coal with gas for domestic heating Eastern Germany,  92% decrease in sulfur dioxide  58% decrease in total suspended particulates  Notable declines in bronchitis, sinusitis, and frequent colds  No decline in asthma

Childhood Respiratory Diseases & the Environment 49 PERSONAL-LEVEL Suggestions for individual patients

Childhood Respiratory Diseases & the Environment 50 ZINC SUPPLEMENTATION  270 children (2-23 months old) with pneumonia randomized to receive 20 mg zinc per day or placebo  Intervention group had reduced duration of severe pneumonia

Childhood Respiratory Diseases & the Environment 51 PERSONAL- LEVEL ANTIOXIDANT SUPPLEMENTATION  Double blind randomized controlled trial among children aged 6-16 years in Mexico City  Children with asthma given either daily vitamin E, C supplementation or placebo  No measurable effect on asthma symptoms or exacerbations  Ozone levels were significantly related to lung function decrements in the placebo group but not in the group receiving vitamin supplements  Vitamin supplements provide some protection against acute effects of ozone on the lungs

Childhood Respiratory Diseases & the Environment 52 PERSONAL-LEVEL SUPPORTING EVIDENCE  Two studies have shown that intake of fish and cereals or whole grains may protect against asthma in children  These foods have high selenium content

Childhood Respiratory Diseases & the Environment 53 IMPLICATIONS FOR PREVENTION  Both outdoor and indoor air pollution exposure linked to exacerbations of respiratory disease  Zinc supplements accelerate recovery from severe pneumonia  Vitamin C and E may blunt effect of ozone on lung function but do not seem to prevent symptoms

Childhood Respiratory Diseases & the Environment 54 CHILDREN NEED CLEAN AIR TO BREATHE Their health, development and well-being depend on it. WHO

Childhood Respiratory Diseases & the Environment 55 Prepared by Ruth A. Etzel, MD, PhD (USA) With the advice of the Working Group on Training Package for the Health Sector: Cristina Alonzo MD (Uruguay); Yona Amitai MD MPH (Israel); Stephan Boese-O’Reilly MD MPH (Germany); Stephania Borgo MD (ISDE, Italy) ; Irena Buka MD (Canada); Lilian Corra MD (Argentina), PhD (USA); Ruth A. Etzel MD PhD (USA); Amalia Laborde MD (Uruguay); Ligia Fruchtengarten MD (Brazil); Leda Nemer TO (WHO/EURO); R. Romizzi MD (ISDE, Italy); Katherine M. Shea MD MPH (USA). Reviewers: WHO CEH Training Project Coordination: Jenny Pronczuk MD Medical Consultant: Ruth A. Etzel MD PhD Technical Assistance: Marie-Noel Bruné, M. Sc Latest update: December 2009 ACKNOWLEDGEMENTS WHO is grateful to the US EPA Office of Children’s Health Protection for the financial support that made this project possible and for some of the data, graphics and text used in preparing these materials.

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