Asthma bronchiale/PGS (VPL)

Astma bronchiale is a lifelong chronic respiratory disease


 * the number of asthmatics is approximately 300 million (worldwide).

In the last 20 years, we have observed an increase especially in children and adolescents - it is becoming the most common chronic disease in children (also in the Czech Republic) Often underdiagnosed and undertreated
 * the health-social-economic impact of asthma on the patient, his family and society increases


 * in the Czech Republic, an estimated 250,000–350,000 asthmatics are currently undiagnosed.

Asthma cannot be completely cured, the goal is effective control of the disease and its symptoms


 * most often we deal with it on an outpatient basis,
 * while untreated asthma causes irreversible functional changes and impairs the patient's performance.

Definition
GINA (Global Initiative for Asthma) issued information (revision 11/2007) emphasizing the inflammatory nature:

Asthma is a chronic inflammatory disease of the airways, many cells and cellular agents are involved. It is a chronic inflammation that causes an accompanying increase in bronchial reactivity, which leads to repeated episodes of wheezing, shortness of breath, chest pressure and coughing during breathing (especially at night and early in the morning). Usually accompanied by extensive, variable bronchial obstruction, which tends to be reversible spontaneously or after treatment.

Epidemiology
Prevalence:


 * total asthma in the Czech Republic – approx. 8%.
 * in children – more than 10%.

Mortality:


 * in the Czech Republic very low (last 10 years) about 1/100 thousand resident.

Increased risk of developing asthma in families with allergies and atopics (especially allergic rhinitis, atopic dermatitis).

Etiology and pathogenesis
Asthma development:


 * internal (on the host side) and external (from the external environment) risk factors apply.
 * Internal factors - affecting the likelihood of developing asthma include:
 * genetic predisposition (to the onset and development of asthma),
 * atopy
 * airway hyperreactivity
 * gender can also participate (children: more common in boys, adults: in women).
 * External factors – lead to higher susceptibility, exacerbation or are the cause of persistent symptoms:
 * inhaled allergens
 * occupational sensitizing substances

they first sensitize the airways (as early as the 17th week of intrauterine life) and then maintain asthmatic inflammation.


 * in residential buildings, especially dust mites, pet allergens,
 * from the external environment, especially pollen and mold.

Tobacco smoke, passive and active smoking (especially by pregnant mothers) and air pollution.


 * after the sensitization phase and as so-called triggers, they cause exacerbations.
 * possibly non-specific stimuli:
 * respiratory infection,
 * exertion,
 * hyperventilation ,
 * weather changes,
 * foodstuffs,
 * emotional tension etc.

Clinical picture of asthma
Onset is possible at any age.


 * Typical repeated shortness of breath conditions:
 * with wheezing in the chest,
 * a feeling of tightness or heaviness in the chest,
 * irritating cough (predominant/as the only symptom),
 * problems most often at night/morning.

Characteristic:


 * great variability of condition,
 * rapid development of symptoms,
 * during exacerbation, shortness of breath at rest,
 * on the lungs a lot of wheezing, prolonged exhalation,
 * serious conditions ev. even the so-called " quiet lung " without spastic phenomena.
 * outside of exacerbations - also asymptomatic with completely normal physical findings.

Comorbidities are often present:


 * allergic rhinitis,
 * possibly atopic dermatitis
 * thus supplementing the clinical picture of asthma.

Anamnesis
It is very important to confirm the pulmonary function test. Variable and reversible obstructive ventilation disorder is characteristic.

Spirometrically
Gold standard (examination by the flow/volume loop method): we can detect an obstructive ventilation disorder , i.e.:


 * reduction of FEV 1 (forcefully exhaled volume in 1 second) below 80% of the appropriate value and/or
 * reduction of the FEV 1 /FVC ratio (FVC – vigorous vital capacity) below 70% .

The pulmonary function parameter for ambulatory monitoring by the patient is PEF (i.e. peak expiratory flow),


 * value reduced - bronchial obstruction.

According to the degree and variability of obstruction, subjective difficulties and the frequency of the need to use relief medication, asthma was divided into degrees:


 * FEV 1 – forcefully exhaled volume in 1 second, FEV 1 value (in % of proper value (NH)).
 * PEF - peak expiratory flow, PEF value (in % of personal best value (ONH))).

If all indicators are not met, or characteristics of the given grade, we classify the patient in a higher grade.

Obstruction:


 * is reversible (except for the most severe stages with fixed obstruction),
 * will confirm the bronchodilation test (BDT):
 * standard BDT is performed by administering 400 µg of salbutamol to the patient (ideally with an inhalation attachment), the result is determined by spirometry after 30 minutes. We will compare the post-bronchodilation values ​​with the pre-bronchodilation (default):
 * it is significantly positive when the FEV 1 ≥ 12% improves and at the same time by 200ml or the PEF value improves ≥ 15%. During the resting period, we can measure completely normal lung function values;
 * therefore, we will perform a test for the presence of airway hyperreactivity using a bronchoconstriction test with a non-specific agent.

Allergological examination
Investigating the share of allergy - revealing risk factors and triggers;


 * skin (prick) tests with standardized allergens and/or
 * serum level of specific IgE.

We will confirm positive findings from the anamnesis .


 * Total IgE alone is not essential for the diagnosis of allergy.

In the case of occupational asthma, we must prove causality, for this purpose:


 * exposure test at the workplace or
 * specific bronchoprovocation test with a suspected substance.

Allergological examination will be carried out whenever asthma is suspected.

We do not postpone the start of asthma treatment while waiting for the results of an allergy test..

Differential diagnosis
Dr. asthma bronchiale supports the simultaneous occurrence of allergic rhinitis or atopic dermatitis, possibly positive family history of allergies.

In diff.dg. we consider diseases:


 * with manifestations of shortness of breath, cough, wheezing, feelings of heaviness in the chest and/or
 * with bronchial obstruction - it is especially necessary to consider the possibility of chronic obstructive pulmonary disease (COPD):
 * typical: chronic, permanent, gradually progressing problems and irreversibility of bronchial obstruction .
 * approx. 10% of patients have asthma + COPD at the same time.
 * dif.dg. reasoning is sometimes more difficult in active smokers.
 * aspiration of foreign bodies (especially in children and the elderly),
 * so-called pseudoasthma (most often from vocal cord dysfunction (VCD - vocal cord dysfunction).



Schema
Clinical picture + medical history + physical examination:


 * 1) pneumological examination (+ possible collection of material for morphological examination)
 * 2) spirometry :
 * 3) * obstruction => bronchodilation test:
 * 4) ** positive => ASTHMA
 * 5) ** negative => COPD / other disease with obstruction
 * 6) * normal => bronchodilation test
 * 7) ** positive => ASTHMA
 * 8) ** negative => it is not a disease with impaired ventilation
 * 9) * restriction susp. - dif.dg. eg IPF, cardiac insufficiency,...
 * 10) allergy examination
 * 11) * negative => atopy not proven
 * 12) * positive => ATOPIA proven => ATOPIC ASTHMA

For asthma and atopic asthma, we start therapy: allergen vaccination, pharmacotherapy, regimen measures.

Classification of asthma bronchiale
Older classification according to the severity of the clinical condition before starting treatment (table above) - disadvantages:


 * it does not consider the fact of different reactions to treatment, different success rates of treatment.
 * Asthma severity or response to treatment may change over the course of the disease.

The new classification is based on the level of control


 * strict requirements: every week with an exacerbation is a week without asthma control and a reason to review maintenance treatment,
 * 3 grades: under control, under partial control or under insufficient control.

NH = proper value, ONH = personal best value

Therapy
The therapy of asthma bronchiale and asthma attack is analyzed by 2 other attestation questions:


 * Bronchial asthma therapy
 * Therapy of an attack of asthma bronchiale‎

Equipment of the VPL surgery
In the first line (general practitioner, ambulatory specialist, RZP doctor), for the initial treatment of asthma exacerbations, in addition to the history and physical examination, the following should be available:


 * exhalation meter ,
 * pulse oximeter ,
 * an inhalation attachment ("spacer") for children and adults or a nebulizer
 * inhaled β2-agonists with a rapid onset of action,
 * oral corticosteroid (Prednisone 20mg or Medrol 16mg)
 * possibly source of oxygen.

An acute exacerbation of asthma should lead to an analysis of the causes that caused it.

Long-term monitoring of asthma
The general practitioner monitors his asthmatic for:


 * frequency and severity of symptoms and exacerbations,
 * PEF values ,
 * limitation of normal activities, missed days from school/work, limitation of leisure activities,
 * correct inhalation techniques,
 * adverse effects of antiasthmatics, comorbidities and comedication ,
 * compliance with non-pharmacological prevention, regimen measures (including non-smoking compliance).

Scheduled Operations
Preparing the patient for the planned surgical procedure:


 * with respect to age, ECG and X-ray S+P are required as part of the pre-operative examination, but spirometry is not required in patients with proven or possible obstructive ventilation disorder,
 * it is recommended to double the anti-asthmatic treatment in advance, as intubation can provoke bronchospasm ,
 * for asthma that is not under control, do not hesitate to increase the doses of anti-inflammatory treatment , ev. start systemic corticoids (20-40 mg of prednisone in adults) 10-14 days before the planned operation . Corticosteroids are discontinued on the day of surgery and 100–200 mg of hydrocortisone (or equivalent) is applied.

Pregnancy

 * prevalence in pregnancy is increasing (now approx. 8.5%),
 * is the most common chronic disease in pregnancy ,
 * during pregnancy, asthma improves in 1/3, does not change in 1/3, and worsens in 1/3 (mostly in the 24th–36th week of pregnancy, towards the end and during childbirth, it rarely worsens),
 * 3/4 of women return to their previous state within 3 months of giving birth .
 * Inadequately controlled asthma is a far greater risk for both mother and fetus than any pharmacotherapy (including systemic corticoids)
 * it is necessary to carefully monitor and check more often - cooperation and mutual awareness of the asthmatologist, gynecologist and general practitioner. No antiasthmatics are contraindicated during pregnancy or lactation.
 * Exacerbation of asthma during pregnancy is managed with intensive treatment while monitoring oxygen saturation (SatO 2 min 95%, otherwise do not hesitate with oxygen therapy – to prevent hypoxic damage to the fetus).

Atopic eczema

 * The first of the diseases of the allergic march ,
 * it arises in 90% in the period from birth to the age of 6 .
 * It is often accompanied by asthma (30% of children and 50% of adults with atopic eczema have asthma at the same time) - it is referred to as the so-called dermorespiratory syndrome.
 * to affect skin and respiratory symptoms, we administer drugs systemically :
 * oral corticosteroids, antileukotrienes and antihistamines .
 * most treatments for both diseases are for local application

Allergic rhinosinusitis

 * in coincidence with asthma, it is referred to as the so-called unified allergic airway syndrome .
 * the pharmacotherapy of both is similar:
 * intranasal corticosteroids, ICS, antihistamines, SAIT .
 * Inadequate control of allergic inflammation can cause problems in other parts of the respiratory tract.

Corticodependent diseases

 * i.e. serious diseases treated with systemic corticoids (oral) - they also favorably affect asthmatic inflammation

airways. Asthma worsens/occurs when total corticosteroids are discontinued:


 * at the same time as corticoids we also administer small doses of ICS ,
 * when discontinuing systemic corticoids, we can increase them if necessary.

Diabetes mellitus (DM)

 * Aggravation/induction of DM by continuous administration of systemic corticoids (in the treatment of cortico-dependent asthma), *short-term course of systemic corticoids for short-term worsening of diabetes ,
 * large doses, especially after β 2 -agonists, can aggravate the tendency to hypokalemia in diabetics.

Cardiovascular diseases (IHD, hypertensive disease)
CHD, hypertensive disease may be aggravated by asthma pharmacotherapy:


 * systemic corticoids, β 2 -agonists.

Asthma can be aggravated by :


 * beta blockers, acetylsalicylic acid (preventive antiplatelet agent).

Differential diagnostic difficulties - relatively frequent cough when taking ACEI.

Thyrotoxicosis
Effects of β 2 -agonists :

they can increase tachycardia, mask the developing thyrotoxicosis with side effects (tremor, tachycardia).

In thyrotoxicosis :


 * check the history of asthma before administration of beta-blockers,
 * thyrotoxicosis can cause an exacerbation/substantial worsening of asthma.

Rheumatic diseases, diseases of the neuromuscular apparatus
Administered nonsteroidal antirheumatic drugs can complicate asthma in ASA and NSAID intolerance.

Gastroesophageal reflux, peptic ulcer disease
GER and VCHGD are aggravated by (long/short) administration of systemic corticoids and theophyllines .

GER itself aggravates asthma (irritation of the autonomic nervous system of the esophagus) and can lead to OIA.

Diseases with impaired liver or kidney function
Deterioration of the breakdown and elimination of systemically administered antiasthmatics - especially theophyllines.

Neurological diseases
Neurological diseases with extrapyramidal tremor:


 * may be aggravated by administration of po/inhalation β 2 -agonists,
 * significant extrapyramidal tremor may be the cause of poor inhalation technique - worsening asthma.

Psychiatric diseases

 * Exacerbation/induction by systemic corticoids in cortico-dependent asthma.
 * β 2 -agonists can induce depression.
 * With serious psychiatric illnesses, there is low compliance and adherence to treatment - it can

be also the cause of OIA,


 * uncontrolled asthma also leads to deterioration of mental health.

Forecast
The prognosis is good for:


 * timely diagnosed and timely treated asthma,
 * provided good compliance (pharmacological and non-pharmacological),

except in cases of difficult-to-treat asthma (OIA).

Prevention
It is still only secondary and tertiary prevention has a component:


 * pharmacological (preventive treatment including allergen vaccination) and
 * non-pharmacological (technical and regime measures, adjustments to the housing, school and work environment - with the task of limiting exposure to asthma inducers and triggers).

The most common comorbidity of asthma – allergic rhinitis often precedes the development of bronchial asthma. In case of persistent colds, it should be min. Spirometry performed once a year to detect bronchial obstruction in time (sometimes even in a clinically mute patient).

Related Articles
On the VPL portal:


 * Bronchial asthma therapy
 * Therapy of an attack of asthma bronchiale‎

On Wikilectures:


 * Asthma
 * Asthma bronchiale/case report
 * Status asthmaticus
 * Bronchial asthma therapy