What are the key concepts highlighted in subsequent definitions of asthma?
- Breathlessness
- Airway hyperresponsiveness
- Bronchospasm
- Reversible airway obstruction
- Inflammation
These concepts emphasize the complexity of the disease.
Asthma is more prevalent in which groups compared to others?
- Children than adults
- Females than males
- African Americans and Puerto Ricans than whites or other Hispanics
African American adults have 4 times ED visit rate that of whites and 2.5 to 3 times more likely to diet from it.
The highest asthma death rate is reported among adults aged how many years old?
65 years old and older
The lowest death rate is among children 0 to 4 years old.
Migrants moving from low to high asthma prevalence areas experience what change?
Increased asthma prevalence
This suggests a role for environmental factors.
What are some major determinants of asthma complications in urban areas?
- Poverty
- Lack of access to medical care
These factors are associated with high mortality rates from asthma.
Factors contributing to asthma morbidity and mortality include under-treatment by emergency clinicians and what other issues?
- Overuse of medications
- Delays in seeking treatment
- Failure to consider previous ED visits
- Failure to initiate corticosteroid therapy early
These factors complicate asthma management.
What is asthma characterized by?
- Variable and recurring symptoms
- Airflow obstruction
- Bronchial hyperresponsiveness
Asthma manifests clinically as attacks of impaired breathing.
Asthma is an inflammatory disease. What are the consequences of repetitive episodes of acute inflammation?
- Alterations in airway function
- Irreversible structural airway changes
Control of asthma symptoms depends on ameliorating airway inflammation.
What factors influence the expression and control of asthma symptoms?
- Genetic factors
- Social factors
- Physiologic factors
- Environmental factors
Asthma is a complex interaction of the immune system, environment, and genetic predispositions.
Compared with healthy individuals, patients with asthma show bronchial hyperreactivity in response to what?
- Environmental stimuli
- Infectious stimuli
Examples include methacholine as a stimulus.
What are some stimuli that induce bronchoconstriction in asthma?
- Allergens (e.g., environmental, viruses, occupational)
- Non-allergic stimuli (e.g., exercise, aspirin-induced, menstrual-related)
These stimuli induce bronchoconstriction via release of mediators and metabolites from inflammatory cells.
What results from edema, inflammation, mucus production, and airway smooth muscle hypertrophy in asthma?
- Bronchoconstriction
- Airway obstruction
- Airflow limitation
Recurrent episodes of airway inflammation contribute to permanent structural airway remodeling.
What findings are revealed in autopsies of patients with fatal asthma?
- Grossly inflated lungs
- Luminal plugs of inflammatory cells, desquamated epithelial cells, and mucus
- Thickening of the airway basement membrane
- Increased deposition of connective tissue
- Mucous gland hyperplasia
- Hypertrophy of airway smooth muscle
These findings indicate severe airway obstruction and inflammation.
True or false: Reports of slow-onset asthma fatalities show less bronchial eosinophilia compared to rapid-onset fatalities.
FALSE
Slow-onset fatalities reveal greater bronchial eosinophilia and basement membrane thickening.
What is observed in rapid-onset fatal asthma cases?
- Greater number of degranulated mast cells
- Less mucus in the airway lumens
This suggests that terminal events may be dominated by bronchoconstriction without excessive luminal plugging.
