Asthma - Disease Information

Overview

Asthma is a chronic inflammatory disease of the airways characterized by variable and recurring symptoms, reversible airflow obstruction, and bronchospasm. Common symptoms include wheezing, coughing, chest tightness, and shortness of breath. Asthma is thought to be caused by a combination of genetic and environmental factors.

Prevalence: Asthma affects approximately 262 million people worldwide and caused 455,000 deaths in 2019. It is the most common chronic disease among children.

Causes & Pathophysiology

Pathophysiology:

Chronic airway inflammation → airway hyperresponsiveness → bronchoconstriction → mucus hypersecretion → airway remodeling → airflow limitation → symptomatic presentation.

Cellular Mechanisms:

Mast cell activation and degranulation
Eosinophil infiltration and activation
T-lymphocyte involvement (Th2 response)
Epithelial cell damage and desquamation
Smooth muscle hypertrophy and hyperplasia
Subepithelial fibrosis

Asthma Phenotypes:

Type	Characteristics	Triggers
Allergic Asthma	Early onset, family history, atopy	Allergens (pollen, dust mites, pets)
Non-Allergic Asthma	Later onset, no atopy	Infections, exercise, irritants
Exercise-Induced	Symptoms during/after exercise	Physical activity, cold air
Occupational	Work-related symptoms	Workplace chemicals, dusts
Severe Asthma	Poor control despite treatment	Multiple, persistent

Symptoms & Presentation

Classic Symptoms:

Wheezing (high-pitched whistling sound during breathing)
Shortness of breath
Chest tightness
Cough (often worse at night or early morning)
Difficulty breathing

Symptom Patterns:

Intermittent: Symptoms ≤2 days/week, nighttime symptoms ≤2 times/month
Persistent Mild: Symptoms >2 days/week but not daily
Persistent Moderate: Daily symptoms, nighttime symptoms >1 time/week
Persistent Severe: Symptoms throughout the day, frequent nighttime symptoms

Asthma Attack Symptoms:

Severe wheezing when breathing both in and out
Coughing that won't stop
Very rapid breathing
Chest pain or pressure
Tightened neck and chest muscles
Difficulty talking
Feelings of anxiety or panic
Pale, sweaty face
Blue lips or fingernails

Risk Factors

Genetic Factors:

Family history of asthma or atopy
Specific gene polymorphisms (ADAM33, ORMDL3)
Race/ethnicity (higher prevalence in African Americans, Puerto Ricans)

Environmental Factors:

Allergen exposure (dust mites, pollen, mold, pet dander)
Air pollution and occupational exposures
Tobacco smoke (prenatal and childhood exposure)
Respiratory infections in early childhood
Obesity
Stress and strong emotions
Certain medications (NSAIDs, beta-blockers)

Protective Factors:

Breastfeeding in infancy
Exposure to farm animals and rural environments in early life
Having multiple older siblings
Early daycare attendance

Diagnosis & Investigations

Clinical Diagnosis:

Based on characteristic symptom pattern and demonstration of variable airflow limitation.

Diagnostic Tests:

Test	Purpose	Findings in Asthma
Spirometry	Assess airflow limitation	Reduced FEV1/FVC ratio, bronchodilator response >12%
Peak Flow Monitoring	Daily monitoring	Diurnal variation >20%
Bronchoprovocation	Assess hyperresponsiveness	Positive methacholine challenge
Allergy Testing	Identify triggers	Positive skin prick or specific IgE tests
FeNO Testing	Measure airway inflammation	Elevated fractional exhaled nitric oxide
Chest X-ray	Rule out other conditions	Usually normal, may show hyperinflation

Management & Treatment

Controller Medications (Long-term):

Medication Class	Examples	Mechanism
Inhaled Corticosteroids	Fluticasone, Budesonide, Beclomethasone	Reduce airway inflammation
Long-acting Beta-agonists	Salmeterol, Formoterol	Bronchodilation (always with ICS)
Leukotriene Modifiers	Montelukast, Zafirlukast	Block inflammatory mediators
Biologics	Omalizumab, Mepolizumab, Benralizumab	Target specific inflammatory pathways

Reliever Medications (Quick-relief):

Short-acting beta-agonists: Albuterol, Levalbuterol
Anticholinergics: Ipratropium bromide
Systemic corticosteroids: Prednisone, Methylprednisolone (for exacerbations)

Stepwise Treatment Approach (GINA Guidelines):

Step 1: As-needed low-dose ICS-formoterol
Step 2: Daily low-dose ICS or as-needed low-dose ICS-formoterol
Step 3: Low-dose ICS-LABA maintenance
Step 4: Medium-dose ICS-LABA
Step 5: High-dose ICS-LABA + consider biologics

Ayurvedic Treatment

Traditional Approaches:

Shodhana (Purification): Panchakarma therapies
Rasayana (Rejuvenation): Immune-modulating herbs
Breathing Exercises: Pranayama techniques

Herbal Formulations:

Sitopaladi Churna: With honey for cough and breathing
Talisadi Churna: For respiratory symptoms
Vasa (Adhatoda vasica): Bronchodilator and expectorant
Kantakari (Solanum xanthocarpum): For bronchial constriction
Bharangi (Clerodendrum serratum): Anti-inflammatory

Ayurvedic Procedures:

Steam inhalation with medicated herbs
Nasya (nasal administration of medicated oils)
Uro-vasti (localized oil treatment on chest)
Yoga and pranayama (breathing exercises)

Diet, Lifestyle & Self-care

Dietary Recommendations:

Warm, cooked, easily digestible foods
Foods with natural anti-inflammatory properties (turmeric, ginger)
Omega-3 rich foods (fish, flaxseeds, walnuts)
Fresh fruits and vegetables rich in antioxidants
Adequate hydration with warm fluids

Foods to Avoid:

Cold foods and beverages
Dairy products (may increase mucus for some)
Processed foods and artificial additives
Foods known to trigger allergies
Excessive sour, salty, or fermented foods

Lifestyle Management:

Regular exercise with proper warm-up
Stress management techniques
Adequate sleep
Smoking cessation and avoiding secondhand smoke
Maintaining healthy weight
Allergen avoidance strategies
Proper inhaler technique education

Prognosis

With proper management, most people with asthma can achieve good control and lead normal, active lives. However, asthma is generally a chronic condition that requires ongoing management.

Factors Affecting Prognosis:

Early diagnosis and appropriate treatment
Patient adherence to medication and follow-up
Severity of disease
Presence of comorbidities
Environmental control measures
Access to healthcare and education

Potential Complications:

Status asthmaticus (severe asthma attack unresponsive to treatment)
Respiratory failure
Pneumonia and other respiratory infections
Airway remodeling and irreversible airflow limitation
Side effects from long-term corticosteroid use
Impaired quality of life and missed work/school
Anxiety and depression
Death (rare with proper management)

When to Seek Medical Care

Seek emergency medical care if you have any of these signs of a severe asthma attack:

Rapid worsening of shortness of breath or wheezing
No improvement after using a quick-relief inhaler
Shortness of breath when doing minimal physical activity
Difficulty speaking in full sentences
Lips or fingernails turning blue
Peak flow reading less than 50% of personal best
Severe chest pain
Rapid heartbeat
Feeling dizzy or lightheaded

Prevention & Screening

Primary Prevention:

Breastfeeding for at least 4-6 months
Avoiding tobacco smoke exposure (prenatal and childhood)
Reducing exposure to indoor allergens
Avoiding unnecessary antibiotic use in early childhood
Maintaining healthy weight

Secondary Prevention (Asthma Control):

Regular use of controller medications as prescribed
Avoiding known triggers and allergens
Annual influenza vaccination
Pneumococcal vaccination when indicated
Regular follow-up with healthcare provider
Asthma action plan development and adherence
Peak flow monitoring for moderate-severe asthma

Screening:

Routine screening for asthma in the general population is not recommended. However, individuals with recurrent respiratory symptoms should be evaluated for possible asthma.