agricultural respiratory disease: it’s not just down on the...
TRANSCRIPT
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Agricultural Respiratory Disease: It ’s Not Just Down on the Farm”
Kathy J. Morris, DNP, APRN, FNP-C, FAANP
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Disclosures
• I have no conflicts to disclose
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Objectives
• Describe 5 common agricultural respiratory hazards
• Identify 4 respiratory conditions associated with agricultural dust and gases exposure
• Determine when personal respirators are appropriate for use in the prevention of acute and chronic agricultural respiratory disease
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Air Quality
• California is noted for air pollution – 2009 Data showed a great deal of the state did not
meet Federal Air Standards. – 2013 Date showed progress 90% counties
• High ozone and particulate matter
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Respiratory Hazards
• National Respiratory Complaints highest common among farmer
• California Population: 37 million (2011) – Rural Population: 5 million – Significant Rural Land Mass- Rural Population
Spread out
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Agriculture Related Jobs
Who besides farmers? Migrant workers Produce workers Nurseries Landscapers Veterinarian
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California Agriculture Top Ten
• Milk and Cream • Almonds
• Grape • Cattle and Calves • Nursery
• Hay
• Lettuce
• Walnuts
• Tomatoes
• Flowers and Foliage
2011 Data
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Other Commodities Top Twenty
• Cotton
• Pistachio
• Rice
• Chickens • Broccoli
• Carrots
• Oranges
• Avocados
• Eggs
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Organic Dust
• Complex Mixture – Vegetable matter – Pollens – Animal dander – Feces - Insect – Bird - Rodent – Feather – Pesticides – Antibiotics – Microorganisms- endotoxins - Molds
• Bacterial and Fungal cell wall toxins
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Inorganic Dust
• Has other elements than the Organic Dust • Mineral dusts
– Crystalline silica predominant inorganic material – Silicates – Quartz – Clay
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Inorganic Dust
• Primarily Associated with Field Activities – Plowing – Tilling – Haying – Harvesting – Burning off stubble – Burning off grape vines
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Inorganic Dust
• Grain Handling – Rice - Cotton • Manual Harvesting
– Tree fruit – Grapes – Vegetables - Rice – Tree Nuts
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Chemical
• Pesticides • Fertilizers
• Paints • Preservatives • Disinfectant • Herbicides
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Animal and Other Gases
• Primary Concerns – Hydrogen sulfide (H2S)
– Ammonia (NH3)
• Secondary Concerns – Carbon Dioxide (CO2)
– Methane (CH4) – Nitrogen Dioxide (NO2)
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Pesticides
• Organophosphates – Applicators or field workers
– Pulmonary symptoms – Muscarinic Effect
• Excessive bronchial secretions • Bronchoconstriction
– Treatment • Airway, Oxygen and Atropine.
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Pesticide
• Fumigants • methyl bromide, ethylene oxide , phosphine
– Gases or liquids under pressure – Injected into soil – Rapidly absorbed in across pulmonary membranes – Also absorbed in the skin Toxic Levels range from respiratory irritant - pulmonary edema – cardiogenic shock
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Herbicides
• Paraquat – dipyridyl
– Irreversible pulmonary fibrosis – Increased Oxygen enhances toxic effects – Low level inhalation does not cause symptoms – Pulmonary effects occur 7-14 days post exposure
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Zoonotic Infections
• Diseases naturally occurring between – Animals and Humans – Need to know the types in your service area
Dairy Cattle – Beef Cattle Anthrax, Rabies, Foot and Mouth disease Poultry Avian Influenza
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Assessing the Patient
• Occupational Health History • WHACS
– What do you do? – How do you do it? – Are you near any dangerous or bothersome
things on the farm?
– Co-Workers with Similar Problems? – Satisfied with your job?
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Diagnostic Tests
• Pulmonary Functioning • Chest X-Ray • ABGS • Exercise Tolerance Testing • Oxygen saturation • Allergy Testing • Blood and Sputum Cultures for Zoonotic
(Lung biopsy may be indicated)
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Organic Toxic Dust Syndrome
• Most Common – Not widely recognized • Respiratory and systemic illness
– exposures to heavy concentrations of organic dusts
• Flu like illness • Onset 4-6 hours after exposure
• Silo unloader’s syndrome
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ODTS
• Diagnostic Findings – Usually Normal O2 saturation and ABGs – Chest X-ray is usually normal – Elevated WBCs up to 20 – See a left shift
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ODTS
• Antibiotics not necessary • Treat symptoms
– Fever Control – Rest – Prevention - Respirator
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Hypersensitivity pneumonitis
• Farmers Lung – Caused by exposure to dust from moldy hay, straw, and
grain. – Prior Exposure and sensitization to allergens
– Repeated exposure leads to inflammation of lungs
Acute disease Sub Acute Chronic
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Hypersensitivity pneumonitis Symptoms
• Fever • Chills • Fatigue • Breathlessness • Chest tightness • Cough
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Diagnostic Finding
• Hypoxemia • May have Infiltrates on Chest X-ray • CT will show reticulonodular changes • Slight Increase WBV • PFT show – restriction and low DLCO
• DLCO- measures oxygen moves from inhaled air to the red blood cells in the pulmonary capillaries
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Hypersensitivity pneumonitis
Acute Farmers Lung Treatment • Prednisone 60 mg per day X2 weeks then
taper • Shortens the duration of the illness • Minimal effect on lung function • Use of respirators with future exposures • Avoidance of tasks that caused the symptoms
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Sub acute farmer’s lung
Symptoms less severe and less clearly related to exposure Symptoms may last for weeks and may include weight loss Treatment is prednisone, avoidance of exposure Change in work practices Respirators
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Chronic farmer’s lung presents
• Long -standing shortness of breath and dry cough
• Pulmonary fibrosis on lung biopsy
• Cannot be distinguished from most other forms of pulmonary fibrosis
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Chronic Farmers Lung
• Chronic farmer’s lung may progress – right heart failure and death
• Only curative treatment is lung transplantation
• Supportive treatments include: • supplemental oxygen, • diuretics, • low sodium diet
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Nitrogen Dioxide Inhalation
• Related to Silo Fillers Disease • Nitrogen Dioxide ( NO2) • Forms rapidly within hours of filling Silo • NO2 predominant gas peak 5-7 days • Inhalation – inflames lungs
– Loss of Consciousness
Permanent scarring lungs
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Nitrogen Dioxide Inhalation
• Mild Exposure – Cough, bronchospasm, nausea
• Continued Exposure – Pleuritic chest pain, dyspnea, pulmonary edema
• High Concentrations – Immediate LOC and pulmonary edema – Pulmonary fibrosis
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Nitrogen Dioxide Inhalation
• Treatment • Low Exposure
– Remove from exposure, prednisone, baseline CXR
• Higher Concentrations
– 100% humidified O2, IV Steroids, – Nebulizer – Bronchodilators, ABGS – May need Intubated – Develop ARDS
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Nitrogen Dioxide Inhalation
• Prevention – Do not enter Silo 10-14 days post filling – Run blowers 30 minutes before entering – Always have Spotter – Rescue Line – Recommend Self Contained Breathing Apparatus
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Carbon Monoxide
• Exposure • Diagnosis – Carboxyhemoglobin level • Treatment 100% O2, may need hyperbaric
– Heaters – Running engines in Shops and Barns – Gasoline powered pressure washer
• Animal confinement
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Asthma Like Syndrome
• Seen in: – poultry barn workers
• Associated with exposure to dust endotoxin – dust, – ammonia
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Asthma Like Syndrome • Symptoms include : • Cough- chest tightness-shortness of breath on –
exertion • Lung function tests:
– normal – show mild airway obstruction
• Chest X-ray essentially negative • This is not allergic disease
– Fewer allergies seen in these workers • Caused by
– endotoxin, ammonia and dust
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Asthma Like Syndrome
• Symptoms • Work history • Lung function tests
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Asthma Like Syndrome Treatment
• Reduce or avoid exposure • Wear a respirator
– especially when loading and – power washing
• But do not have the affected person do high exposure tasks Like power washing of buildings
• Optimize ventilation in barns
• If nothing else helps, consider changing jobs
• Medications used for asthma usually not • effective for this condition
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Farmers with Asthma
• Exposures: • confinement barns - grain dust • may significantly worsen asthma
– also COPD symptoms
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Farmers with asthma
• Reducing exposures that cause symptoms
• Respirators • Change in work practices • May need asthma medications increased during
times of heavy exposure to dust, like harvest
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Chronic Bronchitis
• Daily Cough – 3 months/year for at least 2 year – Prevalence 25%-50% animal/grain production
workers – Highest in Swine workers – Cigarette smoking contributes – Respiratory protection – smoking cessation-
reducing levels of dust and gas in operation
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Sinusitis • Common in workers
– 25% swine confinement – 20-50% animal confinement – Rhinitis
• Allergic vs. bacterial sinusitis • X-ray – CT- Nasal Scraping – Allergy testing • Treat symptoms • Reduce exposure • Antibiotics not routine
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Respiratory Protective Equipment
• Fit Test – must be able to provide adequate protection f – can't protect the wearer if it leaks – ensure that the equipment selected is suitable for
the wearer. – perform at initial selection stage – conducted by a competent person – Should be checked annually
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Contraindications Respirator
• Moderate to severe – COPD – Asthma - Emphysema
• Angina – Recent MI- CHF • Periodic LOC
– Uncontrolled Seizures or Diabetes ( hypoglycemia)
• Claustrophobia • Inadequate Fit Test
– Facial Deformities – Dentures – Facial Hair
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Personal Protective Equipment Respirators
• Person Respirators- Filters the air – Double strap respirators recommended
• Respiratory protection factor (RPF)= 16 – 3 sizes low cost $3.00 – with charcoal to absorb ammonia – for use in hog or poultry barns
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Respirators RPF =19 Filters the Air Different filters handling grain spray painting application of anhydrous ammonia Breathe against resistance more difficult with asthma or COPD Initial cost - Approximately -$35 then replace the filters
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Powered Air Purifying Respirator RPF =30
Self Contained Breathing Apparatus Advantages: • Don’t have to breathe against
Resistance
• Higher protective factor, works when other respirators do not fit
• Cost - $1000 and higher
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Reducing Exposure
• Respirators
• Avoid Exposure – Delegate to persons who are not sensitized or do not have acute problems
• Mechanize feeding systems to decrease direct
– contact.
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Reducing Exposure
• Emission Control – Keep Dust Out • Remove Dust once it is there • Protection with PPI • Modifying work to decrease exposure • Educate workers • Medical Monitoring • Smoking cessation
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Prevention Measures
• New Equipment – Tractors – Combines : Air filtration closed Cabs
• Need to change filters
• Smoking Cessation • Yearly monitoring with high risk patients
– COPD, Chronic Farmers Lung
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Education
• Who needs Educated? – Employer – Patient – Community
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Conclusion
• Respiratory Agriculture disease should be part of Differential Diagnosis
• Occupational history important part of assessment
• Symptoms are often vague and can be mistake for viral or bacterial bronchitis
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Conclusion Nurse Practitioners can play an important role
in treatment and prevention of disabilities Agriculture Respiratory Disease
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Resources
• http://www.cdc.gov/niosh/topics/respirators/
• http://agrisafe.org/farmers/ • http://aic.ucdavis.edu/ • http://www.worh.org/files/AgHealth/resp.pdf
– Wisconsin Program – Excellent Resource
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Resources
• https://www.osha.gov/SLTC/respiratoryprotection/index.html
• http://www.cdc.gov/niosh/topics/surveillance/ORDS/