antiasthmatics
DESCRIPTION
25 slidesTRANSCRIPT
WELCOME
ANTIASTHMATICS
Presented byP.Pavani10T22SO112
Under The Guidence
of Mr. J. Anoop
..Definition: Asthma is a chronic inflammatory disorder of the airways that is characterized by increased responsiveness of the tracheobranchial tree to a variety of stimuli resulting in widespread spasmodic narrowing of the air passages which may be relieved spontaneously or therapy.
• Asthma literally meaning ‘Panting’
Characteristics of Asthma:
Inflammation of airways
Bronchial hyper-reactivity/hyper-responsivness Reversible airway obstruction
CLASSIFICATION OF ASTHMA:
Based on the stimuli initiating bronchial asthma,broad etiologic types are described:
Extrinsic(allergic, atopic) asthma
Intrinsic(idiosyncratic,non-atopic) asthma
Mixed type
PATHOPHYSIOLOGY:
MORPHOLOGICAL FEATURES:
1.The mucus plugs contain normal or degenerated respiratory epithelium forming twisted strips called “Curschmann’s sprials”.
2.The sputum usually contains numerous eosinophils and diamond-shaped crystals derived from eosinophils called “Charcot-Leyden crystals”.
3. Airway remodeling.
Symptoms:
Early Warning SignsBreathing changesSneezingRunny/stuffy noseCoughingChin or throat itchesFeeling tiredDark circles under eyesTrouble sleeping
Asthma Episode SymptomsWheezingShortness of breathTightness in the chest
Severe Asthma Episode Symptomspersonal Severe coughing, wheezing, Shortness of breath or tightness in the chestDifficulty talking or concentratingWalking causes shortness of breathBreathing may be shallow and fast or slower
than usualHunched shoulders (posturing)Nasal flaring
RetractionsCyanosis
.
Asthma Diagnosis:
The diagnosis of asthma is based on:History
Physical examination
Supportive diagnostic tests:
*Pulmonary funcion testsSpirometeryPeak flow meterMethacholine challenge test
*Allergic test*Chest x-ray *GERD assesment test
APPROACHES TO TREATMENT:
1.Prevention of AG:AB reactions2.Neutralisation of IgE antibody
eg: Omalizumab3.Suppresssion of inflamation and bronchial hyperreactivity
eg: cotricosteriods4.Prevention of realease of mediators
eg: mast cell stabilisers5.Antagonism of realeased mediators
eg: leukotriene antagonis ts6.Blocked of constictor neurotransmitters
eg:anticholinergics7.Mimicking dilator neurotransmitter
eg:sympathomimetics.8.Directly acting bronchodilators
eg:methylxanthines
CLASSIFICATION:
Bronchodilatorsß2 sympathomimetics : Salbutamol,
Terbutaline,SalmetrolMethylxanthines : Theophylline,
AminophyllineAnticholinergics : Ipratropium bromideLeukotriene antagonists : Montelukast,
Zafirlukast
Anti-inflammatory agentsMast cell stabilisers : sodium cromoglycate,
NedocromilCorticosteriods
Inhalational : Beclomethasone, fluticasone
Systemic : Hydrocortisone, Prednisolone
Anti-IgE antibody : Omlizumab
STEPWISE MANAGEMENT OF ASTHMA:
Mild intermittent asthma ↓
Regular preventer therapy ↓
Add -on therapy↓
Persistent poor control ↓
Continuous or frequent use of oral steriod
SHORT -ACTING ß2 AGONISTS:
Eg: Salbutamol, T erbutaline
These are mainstay of asthma management
M.O.A:ß2 Receptor stimulation →↑ed cAMP in
bronchial muscle cell → relaxation
Route of administration:By inhalation of aerosol, powder.Salbutamol is given as intravenous infusion in
status asthmaticus.
Adverse reactions:Down regulation of bronchial ß2 receptorsTachycardia , palpitations
CORTICOSTEROIDS:
Corticosteriods afford more complete and sustained symptomatic relief than bronchodialators and others
M.O.A:
Decrease formation of cytokines(Th2), that recruit and activate eosinophils and are responsible for promoting the production of IgE and expression of IgE receptors.
INHALED CORTICOSTERIODS:
Eg: Beclomethasone, fluticasone, ciclesonide
1ST choice in patients with any degree of persistent asthma
ROUTE OF ADMINISTRATION:
Inhalation by MDISLOWLY and DEEPLY inhalation for solution
type inhalersQUICKLY and DEEPLY inhalation for dry
powdet inhalers
ADVERSE REACTIONS:
Hoarseness Oral or pharyngeal candidiasisAdrenal suppression
ICS directly targets underlying airway inflammation
.
SYSTEMIC STERIODS
EG: Hydrocortisone, prednisolone These are oral steriods
Used in status asthmaticus.
ADVERSE REACTIONS:
Adrenal suppression
Cushing syndrome
Growth suppression in children
ANTI-IgE ANTIBODY:
Eg: Omalizumab
M.O.A:This drug leads to ↓ed binding of IgE
to high affinity IgE receptors on surface of mast cells and basophils and limits realease of mediators of allergic response
USES:◦In moderate to severe asthma
patients who are poorly controlled with conventional therapy.
◦Reduces steriod requirements
Status Asthmaticus:
In which the smooth muscles of the bronchi suddenly contract and narrow the airways.Status asthmaticus can vary from a mild form to a severe form with bronchospasm.Status asthmaticus is an acute episode of asthma that remains unresponsive to standard treatment with bronchodilators.
symptoms: extreme difficulty with breathing, which causes
restlessness coughing and wheezing are not common,
because there is not enough airflow advanced symptoms include little or no breath
sounds inability to speak
skin becomes bluish heavy sweating unconsciousness and even cardiopulmonary
arrest, which can be fatal
TREATMENT:
•Hospitalisation is necessary•The initial treatment starts with supplemental oxygen to increase blood oxygen levels.• Inhaled or intravenous bronchodilator to open the airways. •large doses of corticosteroids drugs and bronchodilators to reduce inflammation.
Conclusion:
Asthma is a curable disease, so it is needed to take proper medication and there is a need to follow the medication therapy systematically.