CVPR Week 5: Obstructive Airway Disease Flashcards
Objectives
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Common obstructive lung diseases
5 listed
- Asthma
- Emphysema (COPD)
- Chronic bronchitis (COPD)
- Bronchiectasis
- Cystic fibrosis
Asthma type of lung disease
Obstructive lung disease with reversible airflow obstruction
Asthma types
different phenotypes
Asthma inflammation
Inflammation is prominent
Emphysema lung disease type
Obstructive “COPD” permanent enlargement/destruction of the respiratory bronchioles
Chronic bronchitis lung disease type
“COPD” Sputum production 3 months/year for 2 years
The less common obstructive lung diseases
2 listed
- Bronchiectasis
- Cystic fibrosis
Bronchiectasis description
Enlarged airways and tortuous blood vessels (bronchial arteries) resulting from chronic infection
Cystic fibrosis description
3 listed
- Hereditary disease
- multiple gene mutations
- bronchiectasis with chronic respiratory infections with a failure to thrive
The most common obstructive lung diseases
3 listed
- Asthma
- Emphysema (COPD)
- Chronic Bronchitis (COPD)
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Bronchiectasis clinical course
3 listed
- Abnormal dilation of the bronchial tree
- Causes scarring 7 obstructions & mucus accumulation distally
- May eventually lead to right ventricular failure/respiratory failure
Congenital causes of Bronchiectasis
2 listed
- When due to Kartagener’s presents as GI situs inversus and chronic sinusitis
- Ciliary dyskinesia disorders
Acquired causes of Bronchiectasis
3 listed
- often 2o to severe LRTI in childhood
- Linked to pertussis & measles
- Can occur post TB infection
Types of bronchiectasis
3 listed
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What kind of bronchiectasis is this?
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cylindrical bronchiectasis
What kind of bronchiectasis is this?
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cystic bronchiectasis
What kind of bronchiectasis is this?
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This is actually normal
What kind of bronchiectasis is this?
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Varicose bronchiectasis
What is this?
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bronchiectasis
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Obstructive ventilatory defect definition
essentially means that Forced Expiratory volume is decreased compared to the Forced vital capacity
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The earliest changes associated with airflow obstruction are in?
The small airways
Changes on the flow-volume curve associated with airflow obstruction
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COPD classification by severity
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COPD is classified as
FEV1/FVC = < 0.7
Asthma Definition
A common chronic disorder of the airways that is complex and characterized by variable and recurring symptoms, airflow obstruction [fully/completely reversible], bronchial hyperresponsiveness, and underlying inflammation
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Asthma diagnosis
3 listed
- Diagnosis by history and to confirm, spirometry is used however may be normal if the asthma is under control at the time
- However, a lack of bronchodilator response does not rule out asthma
Asthma clinical features
5 listed
- Wheezing
- SOB
- Cough
- Chest tightness
- Variable Peak Expiratory Flow Rates (PEFR)
Asthma epidemiology
4 things listed
- 40 million individuals died from asthma in 2015 a decrease of 26% from 1990
- Asthma is the most common respiratory disease worldwide affecting 358 million in 2015
- The U.S. Prevalence = 8.3%
- The estimated annual cost of asthma in 2013 was 81.9 billion
Asthma pathophysiology between phenotypes
- Distinct phenotypes of asthma exist however the pattern of airway inflammation does not vary significantly depending upon disease severity, persistence and duration
- The cellular profile and the response of the structural cells in asthma are quite consistent
Asthma phenotypes
5 listed
- Intermittent
- persistent
- exercise-associated
- aspirin-sensitive
- severe asthma
Asthma pathophysiology: Cells involved
6 listed
- T lymphocytes (Th2)
- Mast cells
- Eosinophils
- Macrophages
- Neutrophils
- Epithelial Cells
Asthma pathophysiology: T lymphocyte involvement
produce cytokines IL-4, IL-5, IL-13
Asthma pathophysiology: Mast cell involvement
- mediators of bronchoconstriction (histamine, cysteinyl-leukotrienes, prostaglandin D2)
Asthma pathophysiology: Eosinophil involvement
3 listed
- increased numbers of eosinophils exist in the airway of most but not all asthmatics
- contain inflammatory enzymes, generate leukotrienes and express a wide variety of pro-inflammatory cytokines
- may not be the only primary effector cell in asthma, it likely has a distinct role in different phases of the disease
Asthma pathophysiology: Macrophages involvement
2 listed
- most numerous cells in the airways
- can be activated by allergens to release inflammatory mediators and cytokines that amplify the inflammatory response
Asthma pathophysiology: Neutrophil involvement
- pathophysiological role remains uncertain
Asthma pathophysiology: Epithelial cell involvement
they produce more inflammatory mediators
Asthma pathophysiology diagram
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Asthma pathophysiology diagram 2
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Asthma pathophysiology diagram 3
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Asthma pathophysiology main components of pathology
2 listed
- smooth muscle dysfunction
- airway inflammation
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Asthma Smooth muscle dysfunction leads to?
4 listed
- Bronchoconstriction
- bronchial hyperreactivity
- hypertrophy/hyperplasia
- inflammatory mediator release
Asthma airway inflammation leads to?
Asthma smooth muscle dysfunction and airway inflammation leads to?
symptoms/exacerbations and disease progression
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Asthma pathophysiology Acute response
4 listed
- Bronchoconstriction
- Edema
- Secretions
- Cough
Asthma pathophysiology: Chronic inflammation
3 listed
- Cell recruitment
- epithelial damage
- early structural changes
Asthma pathophysiology: Airway remodeling
3 listed
- cellular proliferation
- extracellular matrix increase
- structural changes
Epithelial damage in asthma
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Intrinsic factors affecting disease expression of Asthma
- genetics of disease
- Duration of asthma
- severity of childhood asthma
- Gender
- Response to therapy
Extrinsic factors affecting disease expression of Asthma
9 listed
- Viral infections
- Allergen exposure
- \Airway irritants
- Exercise
- Compliance
- Season
- Time of day
- Occupational (10-15% of adult asthma)
- Western lifestyle i.e. obesity
Asthma comorbidities that worsen the asthma
4 listed
- GERD-association with asthma 15 - 40 % prevalence
- Sinusitis/Allergic Rhinitis
- Illicit drug use – cocaine
- Non-compliance
Risk factors for death from asthma
- prior severe exacerbations (such as intubation or ICU admission)
- >= 2 hospital admits or >=3 ED visits past year
- admit ED visit with the last month
- Use of >2 canisters/month of β-agonist MDI
- difficulty perceiving symptoms or severity
- illicit drug use
- low socioeconomic status or inner-city residence
- lack of a written action plan
- sensitivity to Alternaria
Pharmacology in asthma goals of therapy
2 listed
Reducing impairment
Reducing risk
Reducing impairment in Asthma
4 listed
- Prevent chronic and troublesome symptoms
- maintain (near) normal pulmonary function
- Maintain normal activity levels
- Meet pts expectations for asthma care
Reducing risk in asthma
3 listed
- Prevent recurrent exacerbations
- Prevent progressive loss of lung function
- Avoid adverse medication side-effects
Medication types for asthma
7 listed
- short-acting β2 agonists
- long-acting β2 agonists
- Inhaled steroids
- Leukotriene modifiers
- Theophylline
- Oral steroids for exacerbations
- Omalizumab
Short-acting β2 agonists
2 listed
- Albuterol
- Levalbuterol
Long-acting β2 agonists
2 listed
- Salmeterol
- Formoterol
Inhaled steroids for asthma
4 listed
- Fluticasone
- budesonide
- Ciclesonide
- Mometasone
Leukotriene modifiers
3 listed
- Montelukast
- Zafilukast
- Zileutin
Theophylline for asthma
?
Oral steroids for asthma
for exacerbations
Omalizumab for asthma
Xolair injections every 2-4 weeks
Rescue medications for asthma
4 listed
- β2 agonists: Albuterol
- Used as needed with symptoms or flares or before exercise
- opens the airway quickly
- if you use this more than 2 times a week you may need a controller medicine
Controller medication for asthma
5 listed
- inhaled steroids
- long-acting β2 agonists
- Cromolyn
- Leukotriene modifiers
- Theophylline
The rule of twos
5 listed
(Who needs controller therapy)
- Two β-agonist canisters/year
- Two doses of β-agonists/week
- Two nocturnal awakenings/month
- Two unscheduled visits/year
- Two prednisone bursts/year
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Asthma medication to treat bronchoconstriction
- β2 agonists
- Theophylline
Asthma medication to treat the inflammation
3 listed
- inhaled steroids
- Leukotriene modifiers
- Cromolyn
Asthma use of inhaled corticosteroids
- The mainstay of treatment for all asthmatics above mild intermittent disease (symptoms more than 2 times/week)
- Blocks many of the inflammatory path, ways in asthma
- Use with a spacer, rinse mouth after use
- Increase or decrease dose in stepwise manner –may take 3 months for plateau
ICS effects in Asthma
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ICS AKA
Inhaled corticosteroids
ICS and death from asthma
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ICS route of administration
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Severity and initiate treatment in patients
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Daily medication in persistent asthma
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Leukotriene modifiers
4 listed
- Anti-inflammatory, affecting cysteinyl leukotriene pathway
- Effective allow decrease in ICs dosing
- Decreases exercise induced bronchospasm by 30-50% compared to placebo
- May be beneficial for true ASA allergic asthmatics
Indicators of poor control for treatment of asthma
3 listed
- Nocturnal awakenings
- urgent care visits
- increased need for rescue medications
Before increasing medication for poor control of asthma consider
4 listed
- inhaler technique
- Compliance
- Environmental changes
- consider other diagnoses
Asthma exacerbations
6 listed
- Allergens
- Respiratory viral infections
- occupational agents
- Exercise stress
- Irritants
- Aspirin, sulfites
Therapy for exacerbations
4 listed
- Steroid therapy
- Early administration decreases total hospital admissions and relapses
- Oral vs IV – equal efficacy
- 125 mg solumedrol IV or 60 mg prednisone PO
COPD description
A disease state characterized by airflow limitation that is not fully reversible… usually both progressive and associated with an abnormal inflammatory response of the lungs… and systemic manifestations
COPD Epidemiology
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COPD Death rates
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COPD Pathogenesis
- cigarette smoking is the leading cause of COPD in western countries
- Burning of bio mass fuels is the leading cause world-wide
COPD Pathogenesis mechanisms
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COPD Pathogenesis repair processes
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COPD Pathogenesis and smoking cessation
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Other phenomena of COPD disease progression
- increased oxidative stress
- Protease-antiprotease imbalance
COPD oxidative stress
3 listed
- Oxidative metabolism is over-activated in COPD
- Bronchial inflammation involving phagocytes (neutrophils & macrophages) adds an internal production of oxidants
- Anti-oxidants such as the glutathione system and the haemoxygenase (HO)-1 pathway insufficiently counteract oxidative stress
COPD Imbalance
4 listed
- proteases are produced by phagocytes within the airways
- Activity is regulated by anti-proteases such as α1-antitrypsin, secretory leukoprotease inhibitor & tissue inhibitor of metalloproteinases (TIMPs)
- Cigarette smoke inhibits the activity of antiproteases
- α1-antitrypsin deficiency is a well-known cause of inherited COPD
Overall mechanisms of cigarette-induced lung damage
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COPD pathophysiology
- the permanent airflow limitation that defines COPD is linked to structural changes
- Emphysema is characterized by a loss of lung parenchyma with increased apoptosis of endothelial and epithelial alveolar cells
- pink puffer phenotype
Pink puffer phenotype
Emphysema
Emphysema is characterized by?
a loss of lung parenchyma with increased apoptosis of endothelial and epithelial alveolar cells
Blue bloater phenotype
smoking-induced COPD
Smoking-induced COPD is characterized by?
- squamous cell metaplasia & goblet cell hyperplasia are hallmarks of smoking-induced COPD
- in proximal and smaller airways the bronchial epithelium is also damaged
- subepithelial changes also occur
- basement membrane thickening
- glands are enlarged & increased in #
- smooth muscle mass is increased
This is the blue bloater phenotype
Risk factors for COPD
10 listed
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COPD lung function decline
only 20-30% of patients who smoke develop COPD however they can develop the other risk factors
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Lung function decline per year in COPD
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What is the best way to treat and correct COPD
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COPD: Lung function and death
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COPD: Causes of death
- pulmonary
- cardiovascular
- cancer
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COPD diagnosis
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COPD reversibility
usually don’t have any reversibility
COPD lung volumes
can show hyperinflation (increasing TLC) and air trapping (increasing RV)
COPD diffusing capacity
Reduced defusing capacity for CO:DLco
COPD Physical exam: Blue bloater
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COPD Physical exam: pink puffer
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COPD: Lab findings
4 listed
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Chest X-ray of COPD: emphysema
- hyperinflation
- lateral flat diaphragm
- increase in retrosternal airspace
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Treatment of COPD
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Therapy for COPD
3 main
- Most important - Smoking cessation
- Oxygen therapy
- Drugs - help improve symptoms
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How reducing environmental and smoking risk factors leads to lung deterioration rates in COPD
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Short-acting β2 agonists
3 listed
- Albuterol
- Pirbuterol
- Levalbuterol
Long-acting β2 agonists
5 listed
- Salmeterol
- Formoterol
- Aformoterol
- Olodaterol
- Vilanterol
Short-acting antimuscarinics
- Ipratropium
Long-acting antimuscarinics
3 listed
- Tiotropium
- Aclidinium
- Umeclidinium
Inhaled corticosteroids agents
3 listed
- Budesonide
- Fluticasone
- Mometasone
phosphodiesterase inhibitors for COPD agents
2 listed
- Roflumilast
- Theophylline
Long-acting β2 agonists effects
5 listed
- Bronchodilation
- Improved lung emptying during tidal breathing and exertion
- reduced hyperinflation
- increased mucociliary transport
- Mucosal cytoprotection
Long-acting antimuscarinic agents onset
onset of action 30 minutes and peak 3 hours after dose
Long-acting antimuscarinic agents considerations with short-acting antimuscarinics
Stop short-acting ipratropium
Long-acting antimuscarinic agents effects for COPD
Have been shown to decrease exacerbation rate
Oxygen therapy for COPD
6 listed
- Improves survival in COPD patients with chronic respiratory failure
- Prevents the progression of pulmonary hypertension
- relieves RV failure
- Improves IQ scores and general alertness
- Increases walking distance, overall endurance and general conditioning
- Reverses polycythemia
Oral steroids for COPD considerations
- 10 - 20% of COPD patients have a significant response to oral steroids
- old theory: 2-week steroid trial with documented improvement on PFTs to justify long term use of inhaled steroids
- effective for acute exacerbation
- Antibiotics decrease the relapse rate
ICS therapy for COPD
- Theoretical advantages for use in COPD however, clinical data was not as convincing
- Effects on airway inflammation variable
- No effect on preventing FEV1 decline
- Possible decrease in the number of exacerbations
Side effects of ICS therapy for COPD
+ association with hip fractures
Stepwise approach for COPD Rx
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Stepwise approach for COPD Rx GOLD guidelines
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More GOLD guidelines
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Pulmonary rehabilitation in COPD
6 listed
- All COPD patients can benefit from exercise training programs
- Improves exercise tolerance
- Improves symptoms of dyspnea and fatigue
- Imporves quality of life measures
- Reduces hospitalizations and days in the hospital
- May improve survival
Other treatment modalities for COPD
6 listed
- Nutrition
- Flu vaccine
- Pneumovax
- Bullectomy
- Lung volume reduction surgery
- Lung transplant
Asthma vs COPD
Mast cells
Asthma: Increased and activated
COPD: normal
Asthma vs COPD
Dendritic cells
Asthma: Increased
COPD: Uncertain
Asthma vs COPD
Eosinophils
Asthma: Increased
COPD: Normal
Asthma vs COPD
Neutrophils
Asthma: Normal
COPD: Increased
Asthma vs COPD
Lymphocytes
Asthma: Th2
COPD: Th1, Tc1
Asthma vs COPD
Epithelium
Asthma: Often shed
COPD: Pseudostratified
Asthma vs COPD
Goblet cells
Asthma: Increased
COPD: Increased
Asthma vs COPD
Airway smooth muscle
Asthma: Increased
COPD: Minimal increase
Asthma vs COPD
Airway vessels
Asthma: Increased
COPD: Not increased
Asthma vs COPD Histopathology overview
- Mast Cells
- Dendritic cells
- Eosinophils
- Neutrophils
- Lymphocytes
- Epithelium
- Goblet cells
- Airway smooth muscle
- Airway vessels
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Asthma age of onset
Usually <40 years
COPD Age of onset
Usually >40 years
Asthma smoking Hx
Not causal but worsens control
COPD smoking Hx
Usually >10 pack-years
Asthma sputum production
Intermittent and variable
COPD Sputum production
Common
Allergies in Asthma
Common
Allergies in COPD
Infrequent
Asthma clinical symptoms
intermittent and variable
COPD Clinical symptoms
persistent and progressive
Asthma course of the disease
Stable (with exacerbations)
COPD Course of the disease
Progressive worsening (with exacerbations)
Asthma importance of nonrespiratory comorbid illnesses
usually not important
COPD importance of nonrespiratory comorbid illnesses
Often important
Asthma spirometry results
Often normalize over time
COPD spirometry results
May improve but do not normalize over time
Asthma vs COPD
- Age of onset
- Smoking Hx
- Sputum production
- Allergies
- Clinical symptoms
- Course of disease
- Importance of nonrespiratory comorbid illnesses
- Spirometry results
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ACOS AKA
Asthma-COPD overlap syndrome
ACOS
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Dinosaurs are cool!
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